IC/Module: LM386 Audio Amplifier
The AudioAMP Board is based on the LM386 power amplifier intended for low-voltage consumer applications. In order to keep external part count low, the gain is initially set to 20. However, with the addition of an external resistor and capacitor between pins 1 and 8, the gain can be increased from 20 to 200. The inputs are ground referenced while the output automatically gives a bias to one-half the supply voltage.