1.5Volt Led using 555 IC

1.5Volt Led using 555 IC

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.

Part List:

R1- 39 kilo-ohms
R2- 100 kilo-ohms
R3-10 ohms but if no light or very dim, just short it
C1- 100nF
C2- 10nF
C3- 220uF electrolytic capacitor
C4- 100uF electrolytic capacitor
D1- preferably schotky diode but ordinary diode like 1N4001 will do
555- use the CMOS type 555
LED- red, yellow and other low power led (do not use white or blue)
1.5V- any 1.5V battery

Continue Reading of 1.5Volt Led using 555 IC...

220 Volt Disco Lamp circuit

This 220 Volt disco lamp circuit is not a voice switch (VOX), because this circuit is too dumb to differentiate between musical sound and human voice. This is more of a voice-activated sound activated. An interesting application is to control the lighting in your disk automatically by the musical sound of high-power amplifier, when the music signal is dominating the sound space. Light nightclub circuit schematic diagram is shown below.

You can use the microphone coil or condenser microphone for this circuit. Make sure that the electrolytic capacitor is rated for 16 volts or more. The potentiometer is shown in the diagram is used to adjust the gain of the pre-amplification. You can adjust this knob to get a proper sound level of the relay would be activated.

Part List Of Disco Lamp circuit

• R1 : 22k 1/4 watt resistor
• R2 : 4K7 watt resistor
• R3 : 2K2 watt resistor
• R4,R8 : 10K watt resistor
• R5 : 33K watt resistor
• R6 : 56K watt resistor
• R7 : 1M watt resistor
• Potensio: 50K
• C1 : 470uf/35V electrolytic capacitor
• C2 : 22n ceramic capacitor
• C3 : 100n ceramic capacitor
• C4 : 1Uf/50V electrolyticcapacitor
• D1 - D5 : 1N4007
• D6 : Zener 5.1v
• D7 : 1N4148
• IC : CD 4069
• SCR : FIR 3D
• Mic : Mic Condensor

Continue Reading of 220 Volt Disco Lamp circuit...

Automatic Lamp switch-on

This circuit called the Automatic Lamp switch-on . area the architecture is primarily advised to acquiesce automated switching of lights that will be alive and inactive, depending on ablaze intensity.

On sirki use this photo resistor R1 charge be installed in a box absolute a complete circuit, but charge accomplish a acceptable aperture in the ancillary of the box to acquiesce the ablaze hitting the sensor. Trim R2 move to the adapted absolute is reached. Setup will crave some testing, but should not be difficult. In this circuit, the best accepted and voltage delivered to the lamp(s) are bound mainly by R6 (that can’t be bare if a apple-pie and reliable switching is expected).

Therefore, the Ohm’s Law charge be acclimated to account the best voltage and accepted ethics of the bulbs. At 3V supply, R6 amount can be bargain to 1 or 0.5 Ohm and the operating voltage of the bulbs should be called accordingly, by applying the Ohm’s Law. Stand-by accepted is beneath than 500µA, provided R2 amount afterwards accent is set at about 5K or higher: therefore, the ability about-face SW1 can be omitted. If R2 amount is set beneath 5K the stand-by accepted will access substantially.

Automatic Lamp switch-on Pat List

R1 = Photo resistor
R2 = 22K
R3 = 1K
R4 = 2K7
R5 = 330R
R6 = 1R5
D1 = 1N4148
Q1 = BC547
Q2 = BD438
LP1 = Filament Lamp(s)
B1 = 6V or 3V Battery

Continue Reading of Automatic Lamp switch-on...

6V Ultra-Bright LED Flashes

6V Ultra-Bright LED Flashes Circuit

At best speed, the LEDs don’t arise to flash, instead they arise to move from one afire one to the next, about and around. They circle absolutely for 4 rotations in two seconds, and again about-face off for a one additional abeyance again echo the sequence. At a lower speed, the cardinal of rotations afore the abeyance is less. It will do three rotations, two or alike alone one circling at its slowest speed. A arrangement of rotations starts with LED #2 and end with LED #9.

Specifications

Battery: Four AA alkaline cells.
Battery life:
Minimum speed and brightness 2.3 years
Medium speed and brightness 1 year
Minimum speed, maximum brightness 4.1 months
Maximum speed and brightness 3.8 weeks

Brightness: controlled with Pulse width Modulation, from off to extremely bright (4000mcd).
Stepper speed: 2 LEDs/sec to 2 revolutions/sec.
Pulse Width Modulation frequency: 3.9KHz.
LED current: 24mA pulses.
LED voltage drop: 3.2V at 24mA. Blue, green and white Ultra-Bright LEDs are suitable.
Minimum battery voltage:
<3V, oscillators do not run.
3V, LEDs are very dim.
4V, LEDs reach almost full brightness.
Radio interference: none.

Circuit Description

* The CD74HC4017N high-speed Cmos IC is rated for a maximum supply voltage of 7V. It is rated for a maximum continuous output current of 25mA. In this project, the maximum supply voltage is 6.4V with brand new battery cells and the 24mA output current is so brief that the IC runs cool.
* The MC14584BCP* IC (Motorola) is an ordinary “4XXX series” 3V to 18V Cmos IC, with a very low operating current and low output current. Its extremely high input resistance allows this project to use high value resistors for its timers and oscillators, for low supply current. Its 6 inverters are Schmitt triggers for simple oscillators and very quick switching.
* IC2 is a 10 stage Johnson counter/decoder. On the rising edge of each clock pulse its outputs step one-at-a-time in sequence. It drives the anode of each conducting LED toward the positive supply.
* IC1 pins 1 and 2 is a Schmitt trigger oscillator with C3 and C4 paralleled for a very low frequency. R1 and R2 control its frequency and the diodes with R3 combine with the capacitors to produce the 15mS on time for the LEDs.
* IC1 pins 5 and 6 is the brightness Pulse Width Modulation oscillator. The pot R7 with the associated diodes and resistors allow it to change the duty-cycle of its output for PWM brightness control. It drives the transistor.
* IC1 pins 3 and 4 is an inverter. It takes the low time (LEDs off) from the clock oscillator, inverts it to a high and shuts-off the brightness oscillator through diode D6.
* IC1 pins 11 and 10 is a sample-and-hold stage. It takes a sample of the pulse driving LED #9 though D3 and R4 and charges C5 in steps. At maximum speed it takes 4 steps for C5 to charge to the Schmitt switching threshold voltage. R5 and D5 slowly discharge C5 for the pause time.
* IC1 pins 13 and 12 is an inverter that resets the counter/decoder and shuts-off the clock oscillator through D4, during the pause time.
* IC1 pins 9 and 8 is not used and is shut-off by grounding its input.
* T1 is the PWM switching transistor. R9 limits the maximum LED current to 24mA.

Continue Reading of 6V Ultra-Bright LED Flashes...