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Class D Switching Power Amplifiers and Power D/A conversion

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Old 1st March 2010, 09:59 PM   #11
diyAudio Member
Join Date: Jan 2010
Location: Cornwall
Originally Posted by fredos View Post
Simply short the speaker output with a TRIAC, and add fuse on supply rail! No relay on speaker line, a cheap 30A TRIAC will do the job and blow fuse on power supply if their any DC! That's the way I protect the speaker from my amplifier and that's work very well!

This seems like a very simple way to implement DC protection! Please could someone explain how this works?

TRIACS have a gate input, is this left disconnected?

Am I also right in thinking that the TRIAC simply allows the DC to pass when it reaches around 1V and therefore allows the fuses to blow? If this is the case, could you just use 2 back to back diodes across the speaker terminals?
Another project of mine: (a very big one at that!)
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