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20W Audio Amplifier using LM1875

20W Audio Amplifier using LM1875
This is just another 20W audio amplifier circuit, but this time based on LM1875 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.