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

Components List:

R1_____________ 150RR2, R3, R5_____ 10KR4_____________ 680RR6_____________ 22KIC1____________ TDA 7294HeatsinkC1____________ 1u5F or 1uC2____________ 2n7FC3, C6________ 22uF 63VC4, C5________ 10uF 63VC7, C9________ 2200uF 50VC8, 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:

Download the explanation of this amplifier circuit in pdf format:
50W Hi-Fi Power Audio Amplifier based TDA7294 302.92 KBDownload Circuit Manual

Download TDA7294 Datasheet:
TDA7294 Datasheet 374.23 KBDownload Datasheet

Kit version of the 50W power amplifier circuit:

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