Power Amplifier Class A by Transistor Reviewed by on . Rating:
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Power Amplifier Class A by Transistor

This is simple Power Amplifier Class A circuit. I used main part electronic is transistor only.
The main power transistor i used TIP41 or TIP31 or C1061 or MJE3055 and next part is TIP42 (PNP) or TIP32 or A761.
It is have power output 20W at 8ohm. and used volte of supply 22V to 28V at 4A.
Detail more please read in image.

Power Amplifier Class A by Transistor



Comments (12)

  • Tarkan

    capacitors goes boom twice while making this.
    and seems it destroyed some of the transistors. damn.

  • mona

    why you have used the TIP 41 and TIP 42 transistors?they are complementary transistors and this mechanism is push-pull mechanism and push-pull mechanism is use in class B type power amplifier.so why you have use this push-pull mechanism in class a amplifier??

  • mona

    but anyhow its working well,,,giving much amplification,,

  • mona

    why complementary transistors have used?TIP 41 and TIP 42 are npn and pnp transistors and this mechanism is use in class B amplifiers,,why you have used in class A?

  • Debbie Austin

    I’ll already try this Power Amplifier Class A by Transistor circuit, and i heard humming sound when the input is connected. All I have to do is to change the transformer from 3 amperes to 6 amperes. and absolutely no heard humming ever after I changed.

  • wahyu

    i already try this circuit. and it’s work… all caps use 50volt. the transformer 7 ampere.. need big heat sink… remember this iis A class amps

  • Keith Gaston

    Even you have high current of power supply you can never feel the full specification of that amp, the most important of amplifier is regulated power supply.

  • jimbo

    i know this thread is very old but here it goes.
    we tried this circuit and got this issues.

    bc337 always burns up.
    current flows through the input (we got electrecuted when power suppy is plugged through the input. input from iphone 4)

    power supply we used is a laptop adapter 19v
    we used a different trans for bc179(any other recommendation?)
    if power supply is connected without any input connected in the first place, bc337 burns immediately. where can i put a volume control

  • jimbo

    the amplification is very good btw and I almost don’t hear any noise/distortion that’s why i like to make it. plus it’s discrete

  • slick

    we tried ciruit but got nothing out no humm or anything is value at r 7 .68 ohm got 7 volts at c5 but nothing at speaker output

  • Emmanuel

    all these amplifier circuits are not working, at least i’ve tried two now and the two circuits are nt working for me, pls i need a functioning circuit of abt 12v to 24v

  • osdfghjk

    the thing oscillates and heats up and lot of distortion weak fake btw if you split the power supply and ground the speaker – and the input ground to the ground it outputs 50 to 200mv in the input but still doesen’t work if you want a real amp visit:http://sound.westhost.com/project3a.htm

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