Make your own free website on
Audio amp. gain=200 (LM 386)
This circuit uses an LM386 to form an audio amplifier with a gain of 200. By putting a resistor in series with the 10uF capacitor, the gain can be adjusted from 200 to 20. The LM386 comes in three styles: LM386-1, LM386-3, LM386-4. The .05uF capacitor and 10 ohm resistor is only required on the LM386-4 part. Output power can be from about 250mw to 1watt depending on part number used and supply voltage.