Simple 10W audio amplifier

john November 2, 2011 11 Comments

Description.
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.

simple-10w-audio-amplifier-circuit

Notes.

  • 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.
Comments
  • Sean
    June 17, 2013

    Hi guys, I have one question, please answer me: How do I get that -12V on op amp? I have 12V adapter, but I don’t understand how do I get that -12V to pin 4? Do I need one more adapter? Please help, thanks.

    • adarsh
      September 23, 2013

      connect the -ve terminal of your battery to 4th terminal of op amp via the resistor…

  • lucky
    May 1, 2013

    hi guys …i make it on breadboard but it is not working kindly tell what is problem in it?

  • kuntal karmakar
    April 15, 2013

    sir
    i am a new viewer of you. actually i am looking for a good sound quality(like buffer) amplifier, for listing music from my phone.would you plz help me my mail id is kuntalkarmakar08@gmail.com

  • Bogdan
    April 7, 2013

    Hi!I have a project to to,a 12Watt audio amp.But I need a 30Kohm input resistance and 2ohm load resistance.The imput voltage being 1uV.Can you help me with an electric diagram?Thank you!

  • Ashish
    November 16, 2012

    what would be the estimated cost of the 10k pot(R9)?

    i want to know about connection of the terminals of capacitors i.e which terminal is connected where(positive and negetive)?

  • Wimpie
    November 12, 2011

    why are my speaker buzzing when i building this amplifier.?????

  • JAKUV
    July 15, 2011

    HI..
    I WANT A LAYOUT PCB FOR THIS CICRCUIT INCLUDING A POWER SUPPLY..
    EMAIL AT tinytech99@yahoo.com
    PLEASE HELP ME FOR MY FINAL PROJECT..

  • August 12, 2010

    hi seetharaman…i always see your post here CT…can i ask something?do you have circuit of wireless headphone?please teach me for that diagram please i really need that project.thank you..hope you can send me a circuit,THANK you!

  • seetharaman
    May 14, 2010

    Hi Andy yes. the line output / ear phone out put of the tv can be fed to this amplifier and you can connect the amplifier output to two speakers of 4 ohms in series to maintain 8 ohms load.

  • andy
    May 13, 2010

    can I use this to connect a pair of speakers to my tv?

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