LM386 Audio Amplifier

Posted on Feb 5, 2014

I picked up an LM386 Low Voltage Audio Amplifier. A little poking around and I found National Semiconductor`s data sheet, showing a schematicthat requires only 5 components for a gain of 20, and 7 for a gain of 200. Being the skeptical man I am, I built the 5 component variation and plugged in my MP3 player. I used a 9V wall transformer for power. Lots of noise resulted.

LM386 Audio Amplifier
Click here to download the full size of the above Circuit.

Well, I discovered the need for a 6th component: Big capacitor on the power supply. It`s usually a rule of thumb to have one anyway, even if you`re running off of a stable supply like a battery. This circuit is simple and effective.

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