Head phone amplifier circuit

admin April 7, 2010 2 Comments


Here is a simple head phone amplifier circuit that can be used to drive your head phone if your music player doesn’t have  enough power to drive your head phones.The circuit is straight forward and uses only three transistors.

The transistor Q1 (BC 239) and associated components forms a pre amplifier.The transistor pairs Q2 & Q3 (BC 337 & BC 327) forms the driver circuit for the speaker. Power amplification is attained at this stage.The emitter voltage of Q1 is fed back to base of Q1 via R3 in order to improve performance and reduce distortion.

Circuit Diagram with Parts List. 



  • The circuit can be powered from a 3V battery.
  • The switch S1 can be used as an ON/OFF switch.
  • Assemble the circuit on a good quality PCB or common board.
  • All capacitors must be rated 10 V.

  • bharath
    February 16, 2014

    sir i want to design a one 100W public address amplifiers can you suggest me how to do ?

  • November 19, 2011

    is it possible to get 1.5v diagra for head phone booster

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