3 Volt Amplifier

This amplifier is low voltage. It operates from a single 3Volt, 500 mA Dc power supply and can give 250 mW stereo output.You can made usb amplifier with this circuit. It use  IC TDA2822 is well set for noise free operation, a good choice as a preamplifier in stereo high power amplifier circuits too. The TDA2822 maximum operating voltage of only 15V.

TDA2822 circuit diagram

TDA2822 pin conection