Monday, August 10, 2009

Simple 10W audio amplifier

The circuit given below is of a simple audio amplifier that can deliver 12W to an 8 Ohm speaker. Op amp IC TL081 is used as the preamplifier here. Actually any opamp with matching power supply ratings can be used instead of TL081.Transistors Q1 and Q2 (TIP125 and TIP120) comprises the power amplifier stage. Output is taken from the collector junction of two transistors.

Circuit diagram.


  • The circuit can be assembled on a Vero board.
  • Heat sinks are recommended for the transistors.
  • A +15V/-15V dual DC power supply can be used to power the circuit.
  • It is better to mount IC1 on a holder.
Source :


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