Friday, July 3, 2015

D02: a simple 80W Bass guitar amplifier built around the TDA7294 IC

As stated by the ST datasheet, the TDA7294 is a monolithic integrated circuit in. Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications.

D02, is a simple 80W Bass guitar amplifier.

I've some parts laying around that i decided to assemble in order to build a portable Bass guitar amplifier. I've a nasty 10" speaker, a power transformer, a car amplifier heatsink, and some other parts found in the on a "dumpster dive".
My friend Matteo gives me a speaker case he does not use more, he also cut's the stickers with his cutter plotter machine.

The circuit is really simple. The preamplifier it is build around a TL072 opamp. The first stage amplify the signal, the second does 3-tone balances.

The amplifier stage is pretty much the same of the ST TDA7294 datasheet, with just some value changed.

The circuit can be definitely improved. But just as it is now, it sounds pretty good.
The first improvement for this amplifier will be a better speaker.

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  • excuse my bad english