Amplifier Thermal Protection

Posted on Aug 14, 2012

This project is really a mixture of ideas, some simple, and others even simpler. The system I have installed in my biamp unit is fan cooling. Once a preset temperature is reached, the fans start, and remain on until the amp is turned off again. This is crude, but very effective. It only operates if I am listening LOUD on a very hot day, which means that the fans have probably only operated about 5 times in their life. I do know about it when they operate because they are fairly noisy (although I have reduced the operating voltage which quietens them down a bit), but at least I know that the amp is protected.

Amplifier Thermal Protection
Click here to download the full size of the above Circuit.

Even simpler is to just switch off the power when the amp overheats. I would use this as a backup to the thermo-fan or fan controller if I left the amp powered on all the time. While I don`t do this, a lot of people do, and although it does waste a

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