Dual Power Amplifier Using TDA7293 MOSFET IC

Posted on Feb 6, 2014

As readers will know, there are already several power amplifier projects, two using IC power amps (aka power opamps). Both have been popular, and this project is not designed to replace either of them. However, it is significantly smaller than the others, so it makes building a multiple amp unit somewhat easier because the space demand is much low

Dual Power Amplifier Using TDA7293 MOSFET IC
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er. It`s quite simple to include 4 amps (two boards) into a small space, but be aware that good heatsinking is essential if you expect to run these amps at significant power levels. The TDA7293 IC uses a MOSFET power stage, where the others featured use bipolar transistors. The main benefit of the MOSFET stage is that it doesn`t need such radical protection circuitry as a bipolar stage, so unpleasant protection circuit artefacts are eliminated. There are no apparent downsides to the TDA7293, although it was found that one batch required a much higher voltage on the Standby and Mute pins than specified, or the amps would not work. This is not a limitation, since both are tied to the positive supply rail and are therefore disabled. This particular project has been planned for a long time, but for some reason I never got around to completing the board or the project description. This is now rectified, and it`s ready to "rock and roll". The board is very small - only 77 x 31mm, so getting it into tight spaces is easy. provided adequate heatsinking is available of course. The TDA7293 has a bewildering number of options, even allowing you to add a second power stage (in another IC) in parallel with the main one. This improves power into low impedance loads, but is a rather expensive way to get a relatively small power increase. It also features muting and standby functions, although I`ve elected not to use these. The schematic is...

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