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 4Ω and 8Ω loads. It has both short circuit and thermal protection, so is quite robust.
Component part 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.
Download the explanation of this amplifier circuit in pdf format HERE
Source: kitrus.com
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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?
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).