tag:blogger.com,1999:blog-31665178747149882652024-03-12T21:46:19.150-07:00Simple Electronic Circuit DiagramWelcome to phone-diagram.blogspot.com, the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams.narutohttp://www.blogger.com/profile/09817863098418403263noreply@blogger.comBlogger58125tag:blogger.com,1999:blog-3166517874714988265.post-33539395985448995802012-03-31T05:12:00.003-07:002012-03-31T05:19:12.274-07:00Detector Circuit of Gas Leak with SEN-1327<div style="text-align: justify;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDidfrInjuMkW8Nwr_IWWve17orPd73IdZwuVVF24hAyZshX3MsN3Mc3x-kYtYeipO6SLY15JvMz7kcfEXByyfoJqsZDAzN68g3pNfgr75JNx_c7GsC2e0ql5pTT9a_K-XAuzUrrsllxEN/s1600/Detector+Circuit+of+Gas+Leak+with+SEN-1327.jpg"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 500px; height: 333px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDidfrInjuMkW8Nwr_IWWve17orPd73IdZwuVVF24hAyZshX3MsN3Mc3x-kYtYeipO6SLY15JvMz7kcfEXByyfoJqsZDAzN68g3pNfgr75JNx_c7GsC2e0ql5pTT9a_K-XAuzUrrsllxEN/s800/Detector+Circuit+of+Gas+Leak+with+SEN-1327.jpg" alt="Detector Circuit of Gas Leak with SEN-1327" id="BLOGGER_PHOTO_ID_5726034061851603026" border="0" /></a>Here is a Detector Circuit of Gas Leak that detects the arising of LPG gas and alerts the user through acoustic indications. The ambit operates off a 9V PP3 battery. Zener diode ZD1 is acclimated to catechumen 9V into 5V DC to drive the gas sensor module. </div><p style="text-align: justify;"> The gas arising circuit uses the SEN-1327 gas sensor bore from RhydoLABZ. Its achievement goes top if the gas akin alcove or exceeds assertive point. A preset in the bore is acclimated to set the threshold. Interfacing with the sensor bore is done through a 4-pin SIP header. </p><p style="text-align: justify;"> Pin data of the gas sensor bore are apparent in Fig. 2. An MQ-6 gas sensor is acclimated in the gas sensor module. The sensor can aswell be acclimated to ascertain burnable gases, abnormally methane. </p><p style="text-align: justify;"> Whenever there is LPG absorption of 1000 ppm (parts per million) in the area, the OUT pin of the sensor bore goes high. This arresting drives timer IC 555, which is active as an astable multivibrator. The multivibrator basically works as a accent generator. </p><div style="text-align: justify;"> Output pin 3 of IC 555 is affiliated to LED1 and speaker-driver transistor SL100 through current-limiting resistors R5 and R4, respectively. LED1 glows and the anxiety sounds to active the user of gas leakage. The angle of the accent can be afflicted by capricious preset VR1. Use a acceptable heat-sink for transistor SL100.<br /></div>narutohttp://www.blogger.com/profile/09817863098418403263noreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-1095662392040845952012-03-21T11:39:00.001-07:002012-03-21T11:45:44.701-07:00ICL8038 Audio Oscillator Circuit<div style="text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEggRh-FFSbVTRBh1pA41JSZH8b47qr4iiILa_4hkHIuSQtwLblV5rQntmcSC6dsBXrZ0PUWshv0LEsOt4oWOtLWmNU6Kg39RE4FDOk-4XuegyB47KFPiQ3wLpRwBQDvs_gDLSgha1XO7iVp/s1600/ICL8038+Audio+Oscillator+Circuit.png"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 400px; height: 312px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEggRh-FFSbVTRBh1pA41JSZH8b47qr4iiILa_4hkHIuSQtwLblV5rQntmcSC6dsBXrZ0PUWshv0LEsOt4oWOtLWmNU6Kg39RE4FDOk-4XuegyB47KFPiQ3wLpRwBQDvs_gDLSgha1XO7iVp/s400/ICL8038+Audio+Oscillator+Circuit.png" alt="ICL8038 Audio Oscillator Circuit" id="BLOGGER_PHOTO_ID_5722423248367826002" border="0" /></a>ICL8038 is a monolithic waveform generator IC that can aftermath sine, aboveboard and triangular waveforms with actual little distortion. The abundance can be programmed from 0.001Hz to 300 KHz application alien timing capacitor and resistor. Abundance accentuation and across-the-board can be accomplished by application an alien voltage. Other appearance of the ICL8038 are top linearity, top akin outputs, accompanying sine, square, triangle beachcomber outputs, low alien locations count, top temperature adherence etc. </div><p style="text-align: justify;"> The alive of ICL8038 is as follows. The external timing capacitor is answerable and absolved application two centralized accepted sources. The aboriginal accepted antecedent is on all the time and additional accepted is switched ON and OFF application a flip-flop. Suppose the additional accepted antecedent is OFF and the aboriginal accepted antecedent is ON, afresh the capacitor C2 will be answerable with a connected accepted (i) and the voltage beyond C2 increases linearly with time. When the voltage alcove 2/3 accumulation voltage, authoritative cast bomb is triggered and the aboriginal accepted antecedent is activated. This accepted antecedent carries bifold the accepted (2i) authoritative the capacitor C2 is absolved with a accepted i and the voltage beyond it drops linearly with time. When this voltage alcove 1/3 accumulation voltage, the cast bomb is resetted to the antecedent action and the aeon is afresh again. </p><p style="text-align: justify;"> The circuit diagram accustomed aloft shows a capricious audio abundance oscillator application ICL8038. Such a ambit is actual advantageous while testing audio accompanying projects. The abundance ambit of this ambit is 20Hz to 20KHz. POT R6 can be acclimated for adjusting the abundance while POT R9 can be acclimated for adjusting the distortion. POT R4 can be acclimated for adjusting the assignment aeon while POT R7 can be acclimated for adverse the variations in assignment cycle. C2 is the alien timing capacitor and R5 is a cull up resistor.<br /></p>narutohttp://www.blogger.com/profile/09817863098418403263noreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-44409630770068522642012-03-04T09:59:00.000-08:002012-03-04T09:59:21.892-08:00SG3524 PWM Inverter Circuit 250W<div class="separator" style="clear: both; text-align: justify;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgF-00GmG_AHJPuE1OwHFNN-wU8I1tR1qo8FIxyW-NdAI0dWhLsjXDbOh_PedgZBI1ty9BT8TodfxmsRm00fuwsKOLHs18dJ9SbyaR9CJfbK_CLUECiYv7JltQSm_MrugFQj6V8G_vfirPK/s1600/SG3524+PWM+Inverter+Circuit+250W.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="222" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgF-00GmG_AHJPuE1OwHFNN-wU8I1tR1qo8FIxyW-NdAI0dWhLsjXDbOh_PedgZBI1ty9BT8TodfxmsRm00fuwsKOLHs18dJ9SbyaR9CJfbK_CLUECiYv7JltQSm_MrugFQj6V8G_vfirPK/s800/SG3524+PWM+Inverter+Circuit+250W.png" width="400" /></a></div>
<div style="text-align: justify;">
A 250W PWM inverter circuit congenital about IC SG3524 is apparent
here. SG3524 is an chip switching regulator circuit that has all capital
chip appropriate for authoritative a switching regulator in individual
concluded or push-pull mode. The congenital in circuitries central the
SG3524 cover beating amplitude modulator, oscillator, voltage reference,
absurdity amplifier, afflict aegis circuit, achievement drivers etc. </div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
SG3524 forms the affection of this PWM inverter ambit which can actual
its achievement voltage adjoin the variations in the achievement load.
In a non PWM inverter the change in achievement amount anon affects the
achievement voltage (when achievement amount increases achievement
voltage decreases and carnality versa), but in a PWM inverter the
achievement voltage charcoal connected over a circuit of achievement load.</div>narutohttp://www.blogger.com/profile/09817863098418403263noreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-52794490391342502722012-02-15T09:52:00.000-08:002012-02-15T10:02:14.665-08:00TDA7560 Car Amplifier Circuit<div style="text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZl_IH-9VdJU2PmMfZud9PBvqFItcodO9HaUMFOGzE1z9oOZ7Q4JuvocRXefW37Op3hG1L193D65GPJwS6cRon9z3zB6Y1NU_-64em2-zEid5QokE96P9m-ezBxtXoJTlhVTfAI_1MU6ju/s1600/TDA7560+Car+Amplifier+Circuit.gif"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 460px; height: 431px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZl_IH-9VdJU2PmMfZud9PBvqFItcodO9HaUMFOGzE1z9oOZ7Q4JuvocRXefW37Op3hG1L193D65GPJwS6cRon9z3zB6Y1NU_-64em2-zEid5QokE96P9m-ezBxtXoJTlhVTfAI_1MU6ju/s800/TDA7560+Car+Amplifier+Circuit.gif" alt="TDA7560 Car Amplifier Circuit" id="BLOGGER_PHOTO_ID_5709423771659832882" border="0" /></a></div><div style="text-align: justify;">TDA7560 is a 4 x 45W QUAD BRIDGE CAR RADIO AMPLIFIER PLUS HSD. The TDA7560’s inputs seem to be ground-compatible and can stand quite high input signals (± 8Vpk) with other out any performances degradation. If the basic} value in to the input capacitors (0.1mF) is adopted, the low frequency cut-off will amount to 16 Hz.<br /><br />The TDA7560 is a breakthrough BCD (Bipolar / CMOS / DMOS) technology class AB Audio Power Amplifierin Flexiwatt 25 package designed for high power car radio. The completely complementary P-Channel/N-Channel output structure allows a rail to rail output voltage swing which, combined with other high output current and minimised saturation losses sets new power references at the car-radio field, with other unparalleled distortion performances.<br /></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-87367763066314325912012-02-07T09:29:00.000-08:002012-02-07T09:33:14.829-08:00Metronome Generator using NE555<div style="text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLKAmTq6RWn0VbcOqEBUi2heyKOVud79qdsvpDsAte1VK9Dt5J4IFiL06aWaApVuOrRmLy-Qnh7j2CFhwthuMJzBK4wQTL4PrspbKi_lvWqZlY2_hl3oCNj9qg_OIcd5uHD7sZ3umdQjMy/s1600/Metronome+Generator+using+NE555.JPG"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 438px; height: 372px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLKAmTq6RWn0VbcOqEBUi2heyKOVud79qdsvpDsAte1VK9Dt5J4IFiL06aWaApVuOrRmLy-Qnh7j2CFhwthuMJzBK4wQTL4PrspbKi_lvWqZlY2_hl3oCNj9qg_OIcd5uHD7sZ3umdQjMy/s800/Metronome+Generator+using+NE555.JPG" alt="Metronome Generator using NE555" id="BLOGGER_PHOTO_ID_5706447736587774018" border="0" /></a></div><div style="text-align: justify;">Here is a simple circuit using IC NE555 which will be used to generate metronomes.Such a circuit is incredibly helpful to people who learns music. The circuit is nothing however an astable multivibrator wired around NE555 .The elements|parts R1,R2&C1 determines the output frequency.<br /></div><p><strong>Notes. </strong></p> <ul><li>The circuit can be wired on a general purpose PCB or common board.</li><li>The circuit can be powered from a 9V PP3 battery.</li><li>The POT R1 can be used to adjust the rhythm of the sound.</li><li>The POT R2 can be used as volume control.</li><li>The speaker k1 can be a n 8 Ohm tweeter.</li></ul>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-77295769021080522592011-12-03T11:08:00.000-08:002011-12-03T11:21:44.077-08:0012V Fan Temperature-Controller<div style="text-align: justify;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiEMGJAStF-XwXZj3uQOBbh6tIkA4oWqwAba92WnrRZ2TT7gvp6lKphzBf5SxL1xEiyYdKMMCB17TozrGtn-_WgcIR29Cd45iGtk9rGWqcLIR9qpamOwvd-1umnh5zimwfgsixEwMJFXi-l/s1600/12V+Fan+Temperature-Controller.GIF"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 285px; height: 191px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiEMGJAStF-XwXZj3uQOBbh6tIkA4oWqwAba92WnrRZ2TT7gvp6lKphzBf5SxL1xEiyYdKMMCB17TozrGtn-_WgcIR29Cd45iGtk9rGWqcLIR9qpamOwvd-1umnh5zimwfgsixEwMJFXi-l/s800/12V+Fan+Temperature-Controller.GIF" alt="12V Fan Temperature-Controller" id="BLOGGER_PHOTO_ID_5681983903553011298" border="0" /></a></div><div style="text-align: justify;">this simple design allows|permits an correct speed control of 12V dc fan motors, proportional to temperature. A n.t.c. Thermistor (R1) is employed as temperature sensor, driving two directly coupled complementary transistors wired during a dc feedback circuit. An optional circuitry was added to remotely monitor fan operation and to permit some type of rough speed indication by means that of the increasing brightness of a LED.<br /></div><h4>Notes:</h4> <ul><li>R5 must be set to allow motor just starting at the desired temperature.</li><li>Any n.t.c. Thermistor in the 6K8 - 22K range value might work, provided R2 value is one/tenth of Thermistor's value.</li><li>R6, R7 and D1 are optional: R7 must be adjusted until the LED glows faintly when the motor is just running.</li></ul>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-5375767091324998932011-11-30T13:23:00.000-08:002011-11-30T13:27:11.221-08:00Temperature Control using LM35DZ<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcpmWIvYP721ZM0zBSPHisuX5lAA1sSiPJ_ma7tILXJjZgwHIw9SPAZvbPKeBtilAJd2Ly8Vm1oPfHA7NuJ_Y-p9JQ302zkGk6oaJ5r5PFuXEe3CS4f4cgV_Mh7Gnr8sSvFWbfvOJ_rgy_/s1600/Temperature+Control+using+LM35DZ.jpg"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 436px; height: 299px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcpmWIvYP721ZM0zBSPHisuX5lAA1sSiPJ_ma7tILXJjZgwHIw9SPAZvbPKeBtilAJd2Ly8Vm1oPfHA7NuJ_Y-p9JQ302zkGk6oaJ5r5PFuXEe3CS4f4cgV_Mh7Gnr8sSvFWbfvOJ_rgy_/s800/Temperature+Control+using+LM35DZ.jpg" alt="Temperature Control using LM35DZ" id="BLOGGER_PHOTO_ID_5680903376757064610" border="0" /></a><br /><div style="text-align: justify;">The temperature control circuit is a circuit thermal simple but very precise control that can be used in applications where automatic temperature control. The circuit switches a miniature relay on or off depending on the temperature detected by the sensor chip LM35DZ single temperature.<br /><br />When LM35DZ detects a temperature higher than the preset level (set by VR1), the relay is activated. When the temperature drops below the set temperature, the relay is deactivated. The circuit can work with any 12V DC source or battery (100 mA min.)<br /><br /><p><strong>Part list:</strong></p> <p>IC1 : LM35DZ<br />IC2 : TL431<br />IC3 : LM358</p> <p>LED1 – 3mm or 5mm LED </p> <p>Q1 – General purpose PNP transistor ( A1015,…) with E-C-B pin-out)<br />D1, D2 — 1N4148<br />D3, D4 — 1N400x (x=2,,,,.7)</p> <p>ZD1 — Zener diode, 13V, 400mW</p> <p>Preset (trim pot) : 2.2K (Temperature set point)<br />R1 – 10K<br />R2 – 4.7M<br />R3 – 1.2K<br />R4 – 1K<br />R5 – 1K<br />R6 – 33Ω</p> <p>C1 – 0.1 µF ceramic or mylar cap<br />C2 – 470 µF or 680 µF electrolytic cap. (16V min)<br />Miniature relay – DC12V DPDT, Coil = 400 Ω or higher </p><br /></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-65732786002068229632011-11-28T10:27:00.000-08:002011-11-28T10:31:10.069-08:0022W Car Subwoofer Driver<div style="text-align: justify;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjXY8a3-2qOd-KvdgGKqQ4CGiu5EgiUcCvpgOUniuNzy-KKlGqxGCVuWLdRLlLM538mEAmdUW4XcIaSPgtN6PmXoJIHx_r-5bJmUyR4k99XmrShjLJ6NjjtGddM_e4G2CuozjgcFweOPDlF/s1600/22W+Car+Subwoofer+Driver.GIF"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 400px; height: 288px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjXY8a3-2qOd-KvdgGKqQ4CGiu5EgiUcCvpgOUniuNzy-KKlGqxGCVuWLdRLlLM538mEAmdUW4XcIaSPgtN6PmXoJIHx_r-5bJmUyR4k99XmrShjLJ6NjjtGddM_e4G2CuozjgcFweOPDlF/s400/22W+Car+Subwoofer+Driver.GIF" alt="22W Car Subwoofer Driver" id="BLOGGER_PHOTO_ID_5680115878723263858" border="0" /></a></div><div style="text-align: justify;"><br />This unit is designed to be connected to an existing car stereo amplifier, adding that often require extra "punch" to music by driving a subwoofer. As the very low frequencies are omnidirectional, a single amplifier is necessary to promote the dedicated speaker.<br /><br />The power amplifier uses a good and cheap BTL (bridge tied load) 13 pin IC from Philips (now NXP Semiconductors) that require a very low of the parties and capable of delivering about 22 W on a charge of 4 ohms in the battery voltage of 14.4 standard car.<br /><br />The signals from the stereo line output amplifier car stereo mix in the entry, after the control level, the signal enters the buffer and can be IC1A reversed phase through SW1. This control can be useful to allow the subwoofer to be in phase with the speakers in your car radio today.<br /><br />Then a variable 12dB/octave filter low pass frequency around IC1B, Q1 and components listed below, which allows precise adjustment of the low pass rate of 70 to 150Hz.<br /><br />Q2, R17 and C9 form a simple voltage stabilizer for the input and filter circuits, useful to prevent interaction of the positive rail power amplifier to the low-level sections.<br /></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-67844222585989949802011-11-27T10:26:00.000-08:002011-11-27T10:31:03.874-08:00QRP Low-Power Transmitters Circuit<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIEGo41-NVRH4P_dZyeRoe6fw2gHDDjgq4TFtwhKsBzS6SsLqAJEMAk6i5jriVuZ1HQfdE2mr-Ew_2JhW4c9vZCHCZHczhjz1K6b9sm5xTtt0OZiYP0WDMBn2ACWWosQ9wSLXTUZCeffjb/s1600/QRP+Low-Power+Transmitters.JPG"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 428px; height: 236px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIEGo41-NVRH4P_dZyeRoe6fw2gHDDjgq4TFtwhKsBzS6SsLqAJEMAk6i5jriVuZ1HQfdE2mr-Ew_2JhW4c9vZCHCZHczhjz1K6b9sm5xTtt0OZiYP0WDMBn2ACWWosQ9wSLXTUZCeffjb/s800/QRP+Low-Power+Transmitters.JPG" alt="QRP Low-Power Transmitters Circuit" id="BLOGGER_PHOTO_ID_5679744771120364274" border="0" /></a><br /><div style="text-align: justify;">Low-Power (3 to 30 MHz) transmitters constructed by hams are generally called QRP. For transmitters of a finely tuned antenna impedance is must.If not fit properly there will be little or no output.But if adjusted properly, there will be great to match results.A circuit antenna properly with the transmitter ID are below.<br /><br />Transmitter output is given to the input of the tuner (connector BNC1). The output of the tuner (connector BNC2) antenna.Then must be connected to L1 and C1 adjusted for maximum transmission power.The transmission power can be checked with an SWR meter.<br /><br /><p><strong>Notes. </strong></p> <ul><li>Assemble the circuit on a goos quality PCB or common board.</li><li>If the matching is not satisfactory then change the values of L1,C1,C2&C3 to the next close value and tune again.</li><li>Proper tuning requires some trial and error.</li><li>The circuit can be enclosed in an aluminum casing for better performance.</li></ul><br /></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-33879494256500579972011-11-26T10:48:00.000-08:002011-11-26T10:53:14.082-08:0020W Bridge Amplifier with TDA2005<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6EBAo3IysZ-o8zb2DfmwEc3_qYZ9lfmFI_9p3_TW_RYwD53ykVT9n6ORGdNRC5xUR4qNwAqIhz2GzAzRUn3zFuRNR5PGNl7e2oKIkwfj5FzEGQSkIQM9QCNDdsAB5JHz72L5BsOiQvVzG/s1600/20W+Bridge+Amplifier+with+TDA2005.gif"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 491px; height: 483px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6EBAo3IysZ-o8zb2DfmwEc3_qYZ9lfmFI_9p3_TW_RYwD53ykVT9n6ORGdNRC5xUR4qNwAqIhz2GzAzRUn3zFuRNR5PGNl7e2oKIkwfj5FzEGQSkIQM9QCNDdsAB5JHz72L5BsOiQvVzG/s800/20W+Bridge+Amplifier+with+TDA2005.gif" alt="20W Bridge Amplifier with TDA2005" id="BLOGGER_PHOTO_ID_5679379254211820210" border="0" /></a><br /><div style="text-align: justify;">TDA2005 is a 20W amplifier is a bridge to the car radio. The TDA 2005 is ClassB dual audio power amplifier in MULTIWATT) package specifically designed for car radio applications: power booster amplifiers are easily designed with this device that provides a high current capability (up to 3.5 A) and that can handle very low impedance loads (up to 1.6 W).<br /></div><br /><div style="text-align: justify;"> TDA2005M is designed to bridge TDA2005S applications for music application. With TDA 2005S can build a 2 x 10watt stereo amplifier circuit 2 x 2Ω speakers with 10% distortion.<br /></div><br />TDA 2005 maximum ratings<br /><br /> Operating Supply Voltage 18 V<br /> DC Supply Voltage 28 V<br /> Peak Supply Voltage (for 50 ms) 40 V<br /> Output Peak Current (non repetitive t = 0.1 ms) 4.5 A<br /> Output Peak Current (repetitive f . 10 Hz) 3.5 A<br /> Power Dissipation at Tcase = 60 °C 30 W<br /> Storage and Junction Temperature – 40 to 150 °CUnknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-9950251415877993442011-11-25T11:42:00.000-08:002011-11-25T11:45:14.205-08:005 Watt Class-A Audio Amplifier<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZwA18sxG86vM951C42uvJ8YnboaOTiIkGEZMUdjgsbhsikX3OL2cWCONInRLAbt6eeoBKZm8EAjr9SL3vzI2otMc7dnAyEZa1R7gWR_ozdYFVeLjrfIFMURaYdD2ep-ZA5TS73VnEOHqL/s1600/5+Watt+Class-A+Audio+Amplifier.GIF"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 390px; height: 280px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZwA18sxG86vM951C42uvJ8YnboaOTiIkGEZMUdjgsbhsikX3OL2cWCONInRLAbt6eeoBKZm8EAjr9SL3vzI2otMc7dnAyEZa1R7gWR_ozdYFVeLjrfIFMURaYdD2ep-ZA5TS73VnEOHqL/s800/5+Watt+Class-A+Audio+Amplifier.GIF" alt="5 Watt Class-A Audio Amplifier" id="BLOGGER_PHOTO_ID_5679021533367711554" border="0" /></a><br /><div style="text-align: justify;">On the day of the old valve, most commercial <span style="font-size:85%;"><span style="font-weight: bold;">audio amplifiers</span></span> suitable for compact integrated single discs or players used stereo amplifier topology of a single valve. The circuit is usually carried out through a multiple type valve, for example, a triode pentode ECL86.<br /><br />Common features of the amplifiers are Class A operation, the output power in the 3 - 5W range, input sensitivity of about 600mV of total output power, THD of 3% @ 1KHz and 3W. Best types showed figures of 1.8% THD @ 3W and 0.8% @ 2W.<br /><br />This solid-state push-pull single-ended Class A circuit is capable of providing a sound comparable to that of tube amplifiers, offering more output power (6.9W measured across a load of 8 ohm speaker cabinet), less THD, higher input sensitivity and better linearity.<br /><br />Voltage and current for this circuit is 24 V and 700 mA, respectively, compared with 250 HT rail and 1A@6.3V heating filament of the valve works with amplifiers. The penalty only for the transistor circuit that works with the need for a larger heat sink for Q2 and Q3 (compared with the maximum power delivered). In any case, the amount of heat generated by this circuit can be comparable to that of a single valve amplifier. A choice of low-boost facility can be added through R5 and C5.<br /><br />This circuit was built and compared with a circuit of a valve box phonograph in the early 1950 by Aren van Waard, a Dutch biochemist working in the field of medical imaging (PET) with a strong interest in audio amplifiers valve. A complete description of the circuits and test results of subjective comparisons made by the distinguished author appeared in the magazine AudioXpress: February, March and April 2005 issues. </div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-77628299491791373442011-11-14T13:49:00.001-08:002011-11-14T13:51:55.204-08:00Power Amplifier using 2N3055<div style="text-align: center;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLOdpGzhoLPUtltg2cOaev70mq7lUTbS4WTl4HM8iIw2Y54ylxv3lJev16xq0fRousiNyIRSCIuiNiwLCqgClqJbcPBt23AbcnrCyQoFc8cNg2IBt3LJaA0e24d1gL7P7QPZXPqahaCyVD/s1600/Power+Amplifier+using+2N3055.gif"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 400px; height: 330px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLOdpGzhoLPUtltg2cOaev70mq7lUTbS4WTl4HM8iIw2Y54ylxv3lJev16xq0fRousiNyIRSCIuiNiwLCqgClqJbcPBt23AbcnrCyQoFc8cNg2IBt3LJaA0e24d1gL7P7QPZXPqahaCyVD/s400/Power+Amplifier+using+2N3055.gif" alt="Power Amplifier using 2N3055" id="BLOGGER_PHOTO_ID_5674971981736333570" border="0" /></a>Power Amplifier using 2N3055 circuit<br /><br /></div><div style="text-align: justify;">Simple and <span id="result_box" class="short_text" lang="en"><span class="hps">cheap</span></span>. The optimum supply voltage is around 50V, but this amp work from 30 to 60V. The maximum input voltage is 0.8 - 1V. As you can see in this design of the components have a big tolerance, so you can build almost of the components, which are at home. The transistors and can be any NPN type power transistor, but do not use Darlington types ... The output power is around 60W.<br /></div><br />Some comments:<br />- Capacitor C1 regulates the low frequencies (bass), as the capacity grows, the lower frequncies are becoming stronger.<br />- Capacitor C2 regulates the higher frequencies (treble), as the capacity grows, the higher frequencies are getting quieter.<br /><div style="text-align: justify;"> - This is a class B amplifier, this means that a current must flow through the transistor effect, even if no input signal. This current can be regulated with the 500ohm, the shear strength. As this incrases current amplifier the sound gets better, but the end transistors are more heating. But if this current Decrease, transistors are not warming much, but the sound gets worse ...<br /></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-36726857863509569072011-10-29T05:42:00.001-07:002011-10-29T05:43:45.686-07:00Electronic DC fuse circuit diagram<div style="text-align: justify;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1fc38V2RaGZGfLvd0tPBuWWd0Ju-0hvvXEcZnS9DvMzIC2FiaBwjh9iJQSf_AVIzVZf8eOBiS-XfIVtWgmCZxyWv9cW5Au0vXxHDvvfN7qomVX01YKBtSjVPVL6cqmZzC_x1dRNrp-NPT/s1600/Electronic+DC+fuse+circuit+diagram.gif"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 400px; height: 240px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1fc38V2RaGZGfLvd0tPBuWWd0Ju-0hvvXEcZnS9DvMzIC2FiaBwjh9iJQSf_AVIzVZf8eOBiS-XfIVtWgmCZxyWv9cW5Au0vXxHDvvfN7qomVX01YKBtSjVPVL6cqmZzC_x1dRNrp-NPT/s400/Electronic+DC+fuse+circuit+diagram.gif" alt="Electronic DC fuse circuit diagram" id="BLOGGER_PHOTO_ID_5668893704802062786" border="0" /></a><br />This <span style="font-size:85%;"><span style="font-weight: bold;">DC electronic fuse</span></span> need not be replaced. It can repair just press one of the S1 button start / restart. Once you press S1, the thyristor T1 triggers and current flows to the load of consumers through T1 and RS resistance. Even after releasing the start button, the current continues to flow as long as the current value does not sink below a certain level.<br /><br />The current flowing through the thyristor T1 will sink below the level of exploitation, when the current is diverted through the 2N3055 transistor T2. T2 and RS are built into the electronic circuit fuse for this purpose. If the voltage drop exceeds RS over the activation voltage base-emitter diode of T2, the transistor thus avoiding the thyristor. The value of the resistance of the RS must be at least 0.2 W. This should be sized to the product of the RS, multiplied by the value of the maximum current is equal to 0.7 volts.<br /><br /> After passing through the T1 T2, the current flowing through the thyristor sinks below the portfolio and the T1 is turned off. This in turn causes the voltage drop across the resistor RS to sink below the activation voltage base-emitter and the transistor T2 is turned off. The end result is the closure of the entire circuit. The DC fuse can be reactivated by pressing the start / restart.<br /><br />The value of the resistor R1 is dependent on the supply voltage. Multiply the supply voltage of 1 KW to get the value of R1. Connect the DC circuit electronic fuse PLUS line of customer load. The drop in the circuit coltage is less than 1 volt.<br /></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-35359054611428572382011-10-10T12:29:00.000-07:002011-10-10T12:31:41.643-07:001.5Volt Led using 555 IC<div style="text-align: center;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-WSkW9S1kAdLU5qXJMq4XkcKIf-pCLdAfx7FCNN8SIwNqCL8BuXd3cuQslDXnRD69JUt3s9C1zs2L8CSsF4ujsqGanJNaK4476sqxnXSk4HNpJbwWFV5CO2QxBT-mPRtB0lIB6Fv32Zpz/s1600/1.5Volt+Led+using+555+IC.jpg"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 400px; height: 247px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-WSkW9S1kAdLU5qXJMq4XkcKIf-pCLdAfx7FCNN8SIwNqCL8BuXd3cuQslDXnRD69JUt3s9C1zs2L8CSsF4ujsqGanJNaK4476sqxnXSk4HNpJbwWFV5CO2QxBT-mPRtB0lIB6Fv32Zpz/s400/1.5Volt+Led+using+555+IC.jpg" alt="1.5Volt Led using 555 IC" id="BLOGGER_PHOTO_ID_5661948271038452066" border="0" /></a><span style="font-weight: bold;">1.5Volt Led using 555 IC</span><br /></div><br /><div style="text-align: justify;">This LED circuit is powered only by the cell of 1.5 V with IC 555. The timer IC is used in astable mode similar to the double-circuit voltage, which is the step from 1.5V to about 2.5V. The frequency of the circuit is about 60 Hz and consumes very little left that is not a problem.<br /></div><b><br />Part List:</b><br /><br />R1- 39 kilo-ohms<br />R2- 100 kilo-ohms<br />R3-10 ohms but if no light or very dim, just short it<br />C1- 100nF<br />C2- 10nF<br />C3- 220uF electrolytic capacitor<br />C4- 100uF electrolytic capacitor<br />D1- preferably <b>schotky diode</b> but ordinary diode like 1N4001 will do<br />555- use the <b>CMOS type 555</b><br />LED- red, yellow and other low power led (do not use white or blue)<br />1.5V- any 1.5V batteryUnknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-5894292112304646672011-09-20T11:15:00.000-07:002011-09-20T11:19:45.942-07:00LM317 Pass Transistor Regulator<div style="text-align: center;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjpQy53mWEzmcCfYicZs3AwwEhJrIiLCtITRpV-eFkNIHD3DRqFnBBMa8m43msBYkmt6hGRyr0qOW1Yu11S0VyShsi8lPcAyjTn6sVAtdTtZ-CUTwlWsdelFlENP_8bFfAeKXvY1B6OjPB5/s1600/LM317+Pass+Transistor+Regulator.png"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 400px; height: 221px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjpQy53mWEzmcCfYicZs3AwwEhJrIiLCtITRpV-eFkNIHD3DRqFnBBMa8m43msBYkmt6hGRyr0qOW1Yu11S0VyShsi8lPcAyjTn6sVAtdTtZ-CUTwlWsdelFlENP_8bFfAeKXvY1B6OjPB5/s400/LM317+Pass+Transistor+Regulator.png" alt="LM317 Pass Transistor Regulator" id="BLOGGER_PHOTO_ID_5654508011115161330" border="0" /></a>LM317 Pass Transistor Regulator circuit<br /><br /></div><div style="text-align: justify;">Existing LM317T output can be raised using an additional power transistor to share a portion of the total. The amount of current participation is established with a resistor in series with the input of 317 and a resistor placed in series with all issuers with pass transistor. In the figure below, the pass transistor will start conducting when the LM317 reaches about 1 amp of current, due to the voltage drop in the resistance of 0.7 ohms. This limitation occurs in about two amplifiers to LM317 will fall on one.4 volts through 0.seven ohm resistor and produce a 700 millivolt drop in resistance of 0.3 ohm emitter. Thus, the existing total is limited to a 2 + (.7/.3) = four.three amps.<br /><br />The input voltage must be around five. five volts higher than the output at full load and heat dissipation at full load would be about 23 watts, so a relatively large heat sink can possibly be needed for both the regulator and pass transistor . The filter capacitor size can be approximately C = IT / E in which this, T is the cycle time by 50 percent (8.33 mS at sixty Hertz), and E is the voltage drop that will occur in 50 percent cycle. To keep the ripple voltage below 1 volt at 4.3 amps, a 36,000 uF capacitor or filter. The power transformer must be massive enough to ensure that the peak input voltage to the regulator is still five.5 volts mentioned above the output at full load, or 17.five volts for an output of 12 volts. This allows a drop of 3 volts through the regulator and a voltage drop 1. through five of the series resistance (0.7 ohm), and a ripple voltage created from the filter capacitor. A larger capacitor filter will reduce the entry requirements, although not significantly.</div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-44043195881037393332011-09-17T11:25:00.000-07:002011-09-17T11:36:32.344-07:00Fire Alarm Circuit using IC 555<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhzWWMYWaOHoSAPjqYpTsu2BRt_v4ny58hST4mM3cdSVDjLRSbXfbba1FvNbJY9be8azdqrLYp7p1cYzSU0-bo4agb5wEBZrI0fdUTcluCvIkwDqOpZvnD7TIe94L52AYNpqp6XyVLFDPf/s1600/Fire+Alarm+Circuit+using+IC+555.gif"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 400px; height: 210px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhzWWMYWaOHoSAPjqYpTsu2BRt_v4ny58hST4mM3cdSVDjLRSbXfbba1FvNbJY9be8azdqrLYp7p1cYzSU0-bo4agb5wEBZrI0fdUTcluCvIkwDqOpZvnD7TIe94L52AYNpqp6XyVLFDPf/s400/Fire+Alarm+Circuit+using+IC+555.gif" alt="Fire Alarm Circuit using IC 555" id="BLOGGER_PHOTO_ID_5653399131212132338" border="0" /></a><br /><div style="text-align: justify;">This <span style="font-size:85%;"><span style="font-weight: bold;">fire alarm circuit</span></span> created based on thermistor and a timer circuit 555. The IC1 (NE555 Timer IC) is configured as an oscillator operating at an audio frequency. The transistors T1 and T2 IC1 unit. The output (pin 3) of IC1 is at the basis of the transistor pairs T3 (SL100), which drives the speaker to generate the alarm sound. NE555 frequency depends on the values of resistors R5 and R6 and C2 capability.<br /><br />When thermistor is heated, it gives a low resistance path to the positive voltage to the base of transistor T1 through diode D1 and resistor R2. Capacitor C1 charges to the positive supply voltage and increases the time for which the alarm is activated. The higher the value of C1, the higher the positive bias applied to the base of the transistor T1 (BC548). As the collector of T1 is coupled to the base of transistor T2, the transistor T2 provides a positive voltage to pin 4 (reset) of IC1 (NE555).<br /><br />Resistance R4 is selected remains inactive NE555 s0 that in the absence of positive voltage. Diode D1 stops discharging the capacitor C1 when the thermistor is related to the positive supply voltage is cooled out and provides a path of high resistance. It also inhibits the bias of the transistor T1.</div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-30064647257308533772011-09-12T10:45:00.000-07:002011-09-12T10:49:06.936-07:00Mini Portable Guitar Amplifier Circuit<div style="text-align: center;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitga3ob-nfXKJ_usURFFJCE8hOLdr1g4ey7PGrXZR2ymg3W299hzpl6F5_ODJ2J_Bq76UWgjhYTNiuWv2i_oJArAhXMx9GlOOJTkQitmD752_2zkJiAh59XmvQuJyqPeBIGAPn5GciZpVe/s1600/Mini+Portable+Guitar+Amplifier+Circuit.GIF"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 271px; height: 193px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitga3ob-nfXKJ_usURFFJCE8hOLdr1g4ey7PGrXZR2ymg3W299hzpl6F5_ODJ2J_Bq76UWgjhYTNiuWv2i_oJArAhXMx9GlOOJTkQitmD752_2zkJiAh59XmvQuJyqPeBIGAPn5GciZpVe/s400/Mini+Portable+Guitar+Amplifier+Circuit.GIF" alt="Mini Portable Guitar Amplifier Circuit" id="BLOGGER_PHOTO_ID_5651531488495158082" border="0" /></a><span style="font-size:85%;"><span style="font-weight: bold;">Mini Portable Guitar Amplifier Circuit</span></span><br /><br /></div><div style="text-align: justify;">This <a href="http://phone-diagram.blogspot.com/2011/08/60-watt-guitar-amplifier-with-tone.html">mini amplifier</a> was meant to be used in conjunction with an electric guitar to do some monitoring of low consumption, mainly for practice, either through a small speaker or headphones. The complete circuit, speaker, batteries, input and output can be locked in a small box the size of a pack of cigarettes, or can also be installed in a real pack of cigarettes, as some units and made available on the market .<br /></div><br />This design can be used in three ways:<br /><ul><li><span class="c">Loudspeaker amplifier</span>: when powered by a 9V alkaline battery it can deliver about 1.5W peak output power to the incorporated loudspeaker.</li><li><span class="c">Headphone amplifier or low power loudspeaker amplifier</span>: when powered by a 3V battery (2x1.5V cells) it can drive any headphone set type at a satisfactory output power level or deliver to the incorporated loudspeaker about 60mW of output power. This configuration is useful for saving battery costs.</li><li><span class="c">Fuzz-box</span>: when powered by a 3V battery (2x1.5V cells) and having its output connected to a guitar amplifier input the circuit will behave as a good Fuzz-box, showing an output square wave with marked rounded corners, typical of valve-circuits output when driven into saturation.</li></ul>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-34108280344674237162011-09-08T12:51:00.000-07:002011-09-08T12:54:49.825-07:00Metal Detector using TDA0161<div style="text-align: justify;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDdWDPsZUkwVnV91XrLC7CEBL4uWN7cXvc3GxH2lTDSQ_21uA2O3P7DBwwTubJKOPTU-v7Paa09JblKQpmGDa2C7JbHd14SWaWo-xjLLOmgUu9iz5w7uKiS418w-y2s1c9ax0__GT7j6XC/s1600/Metal+Detector+using+TDA0161.jpg"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 400px; height: 254px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDdWDPsZUkwVnV91XrLC7CEBL4uWN7cXvc3GxH2lTDSQ_21uA2O3P7DBwwTubJKOPTU-v7Paa09JblKQpmGDa2C7JbHd14SWaWo-xjLLOmgUu9iz5w7uKiS418w-y2s1c9ax0__GT7j6XC/s400/Metal+Detector+using+TDA0161.jpg" alt="Metal Detector using TDA0161" id="BLOGGER_PHOTO_ID_5650079373265840594" border="0" /></a>These <span style="font-size:85%;"><span style="font-weight: bold;">metal detectors circuit is using TDA0161</span></span> monolithic integrated circuit designed for the detection of a metal body by detecting variations in high frequency eddy current losses. For metal detection requires an external circuit TDA0161 LC tuned.<br /><br />The output signal is determined by changes in the current bid. Independent of supply voltage, this current is high or low by the presence or absence of a metal object nearby. Metal detector This circuit uses two LED indicators that provide a visual indication of the presence or absence of metals around the coil. To adjust the circuit need to make sure there is no metal near the coil and then set the fine tuning of a "middle ground". After that you need to adjust the course adjustment to turn the LED and adjust the fine tuning to turn off the LED.<br /></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-40538657061245814102011-09-02T12:13:00.000-07:002011-09-02T12:18:37.849-07:00Digital combination Lock using CD4013<div style="text-align: justify;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzSrL2t4noLObA0eMTJviVByRwpUOZ3QfgZUs4VONJ0Z7bJ_80QZ9BtLVRRV7WPJVWjXEfrLmWo8RrRfHSwzEgVId9fO6YPCOABw-2nn-O6SojBqdI1VmrOKHrXSOrZqQ6RHYJBVvq7L0h/s1600/Digital+combination+Lock+using+CD4013.jpg"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 400px; height: 231px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzSrL2t4noLObA0eMTJviVByRwpUOZ3QfgZUs4VONJ0Z7bJ_80QZ9BtLVRRV7WPJVWjXEfrLmWo8RrRfHSwzEgVId9fO6YPCOABw-2nn-O6SojBqdI1VmrOKHrXSOrZqQ6RHYJBVvq7L0h/s400/Digital+combination+Lock+using+CD4013.jpg" alt="Digital combination Lock using CD4013" id="BLOGGER_PHOTO_ID_5647843049449500738" border="0" /></a>This is a circuit <a href="http://phone-diagram.blogspot.com/2011/09/digital-combination-lock-using-cd4013.html"><span style="font-size:85%;"><span style="font-weight: bold;">Digital combination Lock</span></span></a> is simple but effective ease of automatic reset. The circuit is about double flip-flop IC 4013. Two CD ICs are used here. Push button switches are used to enter the code number. One side of all push-button switches connected to +12 V DC. The other end of 2,3,6,8 buttons are connected to the clock input pins of filp-flops. The other end of other buttons switches are shorted and connected to the pin assembly filp-flops.
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<br /><div style="text-align: justify;"> The relay coil is activated only if the code is entered in the correct order and if there is some variation, the lock is reset. Here is the correct code is 2368.When press 2 on the flop first round (IC1A) will be activated and the value of the data (pin9) is transferred to the Q output (pin13). Since the pin 9 is based the value is "0" and therefore the pin 13 is low. For further press the digits of the code in the correct sequence is "0" leads to the Q output (pin 1) of the last flip flop (IC2b). This makes the transistor and relay energised.The automatic restoration facilities managed by the resistance R11 and capacitor positive C2.The final capacitor C2 is connected to the pin assembly flops.When filp-transistor is turned on , the capacitor C2 begins to charge as the voltage across it becomes enough top-flops are reset. This makes the lock of a fixed amount of time and then automatically locks. The delay time can be adjusted by varying the values of R11 and C2.
<br /></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-53362138700855386172011-08-29T22:38:00.001-07:002011-08-29T22:40:05.904-07:0020W Audio Amplifier using LM1875<div style="text-align: justify;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgmmwpxqR9pDJaVRISgNSlYCcW8y7RQDsVLevwXqydsn6bPgcd0obcVg80nMWRj8wfIp_bL-RWV6jY3W0WKNUCWxkxEnhXdYNvglvrECKcPV5JMa88EYf1Qt34hiQ-gahIxB7Y0rHHAFmRA/s1600/20W+Audio+Amplifier+using+LM1875.png"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 400px; height: 245px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgmmwpxqR9pDJaVRISgNSlYCcW8y7RQDsVLevwXqydsn6bPgcd0obcVg80nMWRj8wfIp_bL-RWV6jY3W0WKNUCWxkxEnhXdYNvglvrECKcPV5JMa88EYf1Qt34hiQ-gahIxB7Y0rHHAFmRA/s400/20W+Audio+Amplifier+using+LM1875.png" alt="20W Audio Amplifier using LM1875" id="BLOGGER_PHOTO_ID_5646519398322585074" border="0" /></a>
<br />This is just another <span style="font-size:85%;"><span style="font-weight: bold;">20W audio amplifier circuit</span></span>, but this time based on <span style="font-size:85%;"><span style="font-weight: bold;">LM1875</span></span> audio amplifier IC from National Semiconductor. With a dual power supply 25V LM1875 can deliver 20W of audio power into a 4 ohm speaker. The LM1875 requires fewer external components and has a very low distortion. The IC is also filled with a number of cool features, like the upload speed fast, wide range power supply, high output current, high-swing output voltage, thermal protection, etc. The IC is available in TO -220 plastic power package and is very suitable for a variety of applications including audio systems, servo amplifiers, home theater systems, etc.
<br /></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-43378091666309160412011-08-25T21:19:00.000-07:002011-08-25T21:24:54.791-07:00AM Receiver based on TDA1572 IC<div style="text-align: justify;"><div style="text-align: justify;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5tR9RKPusxjTbb2A-hxy20XzyRzaIeLll0iUTGSwWu1Q0HdQx7Dtfw_R0CyOPZGO6Ax6AKiVqZg1btAlmLQrXI7AVBKiASu0qIF3K_EakcW87zOhxIAkHJKvAKB18w5WtC6tQ7yaOdvsu/s1600/AM+Radio+Circuit+using+TDA+1572.png"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 400px; height: 260px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5tR9RKPusxjTbb2A-hxy20XzyRzaIeLll0iUTGSwWu1Q0HdQx7Dtfw_R0CyOPZGO6Ax6AKiVqZg1btAlmLQrXI7AVBKiASu0qIF3K_EakcW87zOhxIAkHJKvAKB18w5WtC6tQ7yaOdvsu/s400/AM+Radio+Circuit+using+TDA+1572.png" alt="AM Receiver based on TDA1572 IC" id="BLOGGER_PHOTO_ID_5645015157749029218" border="0" /></a>The circuit is a high performance <span style="font-size:85%;"><span style="font-weight: bold;">AM receiver based on the Philips TDA1572 IC.</span></span> The TDA1572 is an integrated AM receiver circuit that has all the essential circuits such as RF amplifier, mixer, IF amplifier, AGC circuit, the pilot signal strength indicator, audio pre amplifier, etc. controlled oscillator incorporated into it. The internal oscillator frequency can be up to 50 Hz and the IC can accept RF signals up to 500 mV. HF inputs are static protected and separate buffer, voltage controlled oscillator makes it possible to use single coils in the circuit.
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<br />Inductor L1 connected between pins 14 and 13 of the IC sets the frequency of the oscillator. Potentiometer R12 is used to vary the voltage on the varicap tuning diode D2. C4 is associated with the internal balance of full-wave detector circuit. Pin 11 is the circuit output if the internal field indicator of strength. The power available on this pin is a function of field strength available and has a good linearity for logarithmic input signals.
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<br />The intermediate frequency of this circuit is built around 455 KHz. The band pass filter circuit ago about CF1 and CF2 6kHz select the band around the intermediate frequency. In simple words, IF double-balanced mixer output available on pin is filtered and applied to the input of gain controlled amplifier filter capacitors C16 and C17 are used to reduce the solution time of AGC. The transistor Q2 and associated components form the driver circuit M1 field strength meter. Resistors R9 R5and preset can be used to configure the meter. Capacitor C3 is a bypass capacitor for the audio preamplifier circuit of frequency within the IC. Capacitors C16 and C12 prevent noise (if any) of the power line.
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<br />TDA7052 is an audio stage 1W amplifier to drive the speaker. TDA7052 is an integrated bridge amplifier that can deliver an output power of 1W at 8 ohm speaker. Capacitor C18 couples the audio output of the TDA1572 to TDA7052. Potentiometer R10 can be used to control the volume.
<br /></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-24510076941057434222011-08-21T00:48:00.000-07:002011-08-21T00:55:56.907-07:00Nimh Battery Charger using LT 4060<div style="text-align: justify;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXhuo3HTq-mLVusf6cx9tHE_C3g204TMOZ1N25VsyB2AiMiGtDvxz1DntN9pPeC61XUm9BHS3tTBeU6STNHdqnQKG5SaSF3GMA5-OCAZanshRhoIIByir2ZBstO5JhyAPDGFyCnv7AsOq1/s1600/Nimh+Battery+Charger+using+LT+4060.png"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 400px; height: 270px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXhuo3HTq-mLVusf6cx9tHE_C3g204TMOZ1N25VsyB2AiMiGtDvxz1DntN9pPeC61XUm9BHS3tTBeU6STNHdqnQKG5SaSF3GMA5-OCAZanshRhoIIByir2ZBstO5JhyAPDGFyCnv7AsOq1/s400/Nimh+Battery+Charger+using+LT+4060.png" alt="Nimh Battery Charger using LT 4060" id="BLOGGER_PHOTO_ID_5643214547085772146" border="0" /></a>
<br />This is the outline of a powerful <span style="font-size:85%;"><span style="font-weight: bold;">battery charger</span></span> and efficient <span style="font-size:85%;"><span style="font-weight: bold;">Ni-MH IC LT4060</span></span> from Linear Technologies. In addition to the Ni-MH Nickel-cadmium can also be gained by slightly modifying the load circuit.For Ni-Cd CHEM connect pin (pin12) of the IC + Vcc.Here circuit is configured to load 2 connected cells in series. By altering the connections and SEL1 pins SEL0 up to 4 batteries in series can be charged with this circuit.
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<br />To load a single cell, are connected and SEL1 pin to GND SEL0. For filling two cells connected to GND and Vcc SEL0 SEL1. For filling three cells, connected to VCC and SEL0 SEL1 to GND. For filling 4 cells, and SEL1 pins SEL0 connect to VCC. The circuit also has the charging temperature NTC thermistor based qualification.An connected to the NTC pin (pin11) of the IC operates as the temperature sensor.
<br /></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-4483301492994360132011-08-18T08:43:00.000-07:002011-08-18T08:53:10.626-07:00Automatic Amplifiers Cooler Fan<div style="text-align: justify;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgr17yrdnFeoP3IU1zYoIfjtayyIRCPU-ZoV-MFBLEIvgzxdoBXQKiVCN0Vd7pI1cyKQLINDBYRp7Upy7frwvZNKpzOC04XEbQ6pYgHDosQMjrEPPmOCntjn4PPzSF9TajyMNOlViJ4zYDc/s1600/Automatic+Amplifiers+Cooler+Fan.png"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 400px; height: 185px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgr17yrdnFeoP3IU1zYoIfjtayyIRCPU-ZoV-MFBLEIvgzxdoBXQKiVCN0Vd7pI1cyKQLINDBYRp7Upy7frwvZNKpzOC04XEbQ6pYgHDosQMjrEPPmOCntjn4PPzSF9TajyMNOlViJ4zYDc/s400/Automatic+Amplifiers+Cooler+Fan.png" alt="Automatic Amplifiers Cooler Fan" id="BLOGGER_PHOTO_ID_5642223382624518706" border="0" /></a>
<br />The schematic of an <span style="font-size:85%;"><span style="font-weight: bold;">Automatic Amplifiers Cooler Fan</span></span> is given here. The circuit automatically turn on the cooler fan whenever the temperature of the heat sink exceeds a preset level. This circuit can save plenty of energy becausef the cooler fan are going to be OFF when the amplifier is running on low volume. At low volume less heat are going to be dissipated and it'll not trigger the cooler fan ON.
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<br />The temperature is sensed using an NTC (negative temperature coefficient) thermistor R2. Junction of thermistor r2 and resistor R1 is connected to the inverting input (pin3) of IC1 that is wired as a comparator. The non-inverting input (pin2) is given with a reference voltage using the preset R3. As temperature will increase the resistance of NTC thermistor can drop and so do the voltage across it. When the voltage at the inverting input becomes but that of the reference voltage (set for a selected threshold temperature) the output of the comparator goes high and switches the transistor Q1 ON. this can activate the relay and the cooler fan are going to be switched ON. When the temperature decreases the reverse happens. LED D2 can glow when the fan is ON. Diode D1 could be a freewheeling diode.
<br /></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-23082165583978471502011-08-15T09:23:00.000-07:002011-08-15T09:35:26.219-07:00Fuse with Automatic Status Indicator System<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEic8KWUTXcZNMbtllsTnINQPXvhcMYjllwvwjOJ0a-cKAFKgT1Nj_fXWWUHxyPlVJPzrT5aCArfX0kv_1kM03Bl50kLtyJDWZDQfidHZdqnKFMa-7nk7qCu4lpU53mEI8WMfn7Cb-9JmY8P/s1600/Fuse+with+status+Indicator+System.jpg"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 400px; height: 226px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEic8KWUTXcZNMbtllsTnINQPXvhcMYjllwvwjOJ0a-cKAFKgT1Nj_fXWWUHxyPlVJPzrT5aCArfX0kv_1kM03Bl50kLtyJDWZDQfidHZdqnKFMa-7nk7qCu4lpU53mEI8WMfn7Cb-9JmY8P/s400/Fuse+with+status+Indicator+System.jpg" alt="Fuse with Automatic Status Indicator System" id="BLOGGER_PHOTO_ID_5641121629770287634" border="0" /></a>
<br />Here is the circuit of a<span style="font-size:85%;"><span style="font-weight: bold;"> fuse is an automatic indicator status</span></span>. This circuit can be added to a circuit that operates from 12V DC. As long as the fuse is intact, the LED D3 will light continuously and when the fuse blows the LED will flash and continue.
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<br /><div style="text-align: justify;"> The first part of the circuit includes an astable multivibrator built around the transistors Q1 and Q2.The multivibrator output is coupled to the base of Q3 via diodes D2.When the fuse is intact, the base of Q3 retired to a positive voltage resistor R5. The transistor turns on and remains lit LED D3. When the fuse blown, the base of Q3 will no longer be pulled to a positive voltage bias and now only available at the base of Q3 will be the output of the astable multivibrator. However, the transistor Q3 will start the change in frequency of astable multivibrator and the LED blinks agree.
<br /></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-3166517874714988265.post-35473362999725313872011-08-11T09:54:00.000-07:002011-08-11T09:57:36.234-07:00Ramp Generator Circuit-using NE555<div style="text-align: justify;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBTLVVaeYl729FaxzZjjnhTcgZ96s6CE7_h7fCEAZQInH0rLd3fr3-G0ubiZ2dcEEnBCaJ9eDXuuL7xHs_4HSGWdznkM5sUn9oVR3cX_lSW88_HIHVq76QLsDr3Nyt445qBMywDw0rutd4/s1600/Ramp+Generator+Circuit-using+NE555.jpg"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 400px; height: 218px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBTLVVaeYl729FaxzZjjnhTcgZ96s6CE7_h7fCEAZQInH0rLd3fr3-G0ubiZ2dcEEnBCaJ9eDXuuL7xHs_4HSGWdznkM5sUn9oVR3cX_lSW88_HIHVq76QLsDr3Nyt445qBMywDw0rutd4/s800/Ramp+Generator+Circuit-using+NE555.jpg" alt="Ramp Generator Circuit-using NE555" id="BLOGGER_PHOTO_ID_5639643005123582658" border="0" /></a>We know that if a capacitor is charged from a voltage supply through a resistor, an exponential waveform is created while charging of a capacitor from a continuing current supply produces a ramp. this is the concept behind the circuit. The circuit of a ramp generator using timer 555 is shown in figure. Here the resistor of previous circuits is replaced by a PNP transistor that produces a continuing charging current.
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<br />Charging current produced by PNP constant current source is <p style="text-align: justify;"><strong>i</strong><sub><strong>C </strong></sub><strong>= Vcc-V</strong><sub><strong>E </strong></sub><strong>/ R</strong><sub><strong>E</strong></sub></p> <p style="text-align: justify;"><sub> </sub></p> <p style="text-align: justify;">where <strong>V</strong><sub><strong>E </strong></sub><strong>= R</strong><sub><strong>2 </strong></sub><strong>/ (R1 + R2) * V</strong><sub><strong>CC </strong></sub><strong>+ V</strong><sub><strong>BE</strong></sub></p><div style="overflow: hidden; color: rgb(0, 0, 0); background-color: transparent; text-align: left; text-decoration: none; border: medium none;">When a trigger starts the monostable multivibrator timer 555 as shown in figure, the PNP current supply forces a continuing charging into the capacitor C. The voltage across the capacitor is, therefore, a ramp as illustrated in the figure. The slope of the ramp is given as <strong><em>Slope, s = I/C
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