2 USB audio amplifier

Simple amplifier circuit suitable for speakers that can be directly connected to your laptop or computer. The power source is a 5V coming from USB port. The amplifier IC used is TDA2822M of ST Microelectronics.

Part List:
R1, R2 - 10 kilo ohms 1/4W
R3, R4 - 4.7 ohms 1/4W
C1, C2 - 100uF electrolytic capacitor
C3, C4 - 470uF electrolytic capacitor
C5, C6 - 0.1uF electrolytic capacitor
C7 - 10uF electrolytic capacitor
SR, SL - 8 ohms speaker
IC - TDA2822M dual low voltage audio amplifier


  1. Is the signal input for the amplifier taken from the same USB from pins(2 and 4) or should separately be taken from the headphone jack of the pc..?

  2. Audio signal is taken from separate audio jack. The use of USB is for power source only