50W Power Amplifier with IC TDA7294

This is a great audio amplifier circuit based on single power IC TDA7294. TDA7294 is intended for use as a high quality audio class AB amplifier in hi-fi applications. It has very low noise and distortion, wide bandwidth and good output current capability, enabling it to supply high power into both 4? and 8? loads. It has both short circuit and thermal protection, so is quite robust.

50W Power Amplifier with IC TDA7294 circuit diagram

Components List:

R1_____________ 150R
R2, R3, R5_____ 10K
R4_____________ 680R
R6_____________ 22K
IC1____________ TDA 7294
Heatsink
C1____________ 1u5F or 1u
C2____________ 2n7F
C3, C6________ 22uF 63V
C4, C5________ 10uF 63V
C7, C9________ 2200uF 50V
C8, C10_______ 100nF

With the addition of a handful of parts and a suitable power supply, this module will deliver over 50W RMS into 4 or 8 ohms with < 0.1% Total Harmonic Distortion (THD) and < 0.1% Intermodulation Distortion (IMD). A similar circuit was published in Elektor magazine, 11/96.

It is also suitable as a replacement power amp stage, or upgrade for many existing amplifiers of between 30W-50W, provided they have a suitable dual supply, and most do.

Suggested power supply for this audio amplifier:

35V Symmetrical Power Supply

Download the explanation of this amplifier circuit in pdf format:

Download TDA7294 Datasheet:


Source: kitrus.com

Kit version of the 50W power amplifier circuit:

50W Power Amplifier


5 thoughts on “50W Power Amplifier with IC TDA7294

  1. Kumar TM.

    Tda7294 two ics used to get the o/p 150watts stereo..
    Required the good supply voltage.

  2. dan46

    i build this amp and it work,but the mute and stanby switch are not working how can i do about it?
    can i use this amplifire as a pre amp ?

  3. husnain

    where the earth conection has been conected there is no option
    reply me soon

  4. circuit diagram Post author

    i think you can use touch switch circuit, please try to find in another post.
    just leave the stanby and mute system as is without connection (NC).

  5. Asif

    I built this amplifier today, this is a great, yes I said great power amplifier to be made by a beginner. I’m really impressed by it’s clean-ness of sound, and also, the bass is really perfect….

    I just have some questions, how can I wire mute and standby switches? What kind of switch is good for it? Like a switch when we press it and it stay on, or the other switch when we press it, it does connect and when we remove our hand from the switch it disconnects…!!!

    And I’ve another question. How can I permanently remove those standby and mute system from the circuit?

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