DC speaker protection for stereo LM3886

[wolf-audio]

I'm looking for a simple dc protection circuit for a stereo LM3886 amp, I don't care if the amp or protection circuit survives as long as the speakers do. No suggestions for chinese garbage off of ebay please, I want to build it with legitimate parts from Mouser.

 

[AndrewT]

A big relay rated for DC greater than your maximum supply voltage. This is the part that protects your speakers from output offset.

Drive it with a delayed start up and instant off, if mains fails.

Then add on a DC detection that activates the instant off.

 

[Arty]

the absolute most simplest ever protection is...
a big and FAT cap in series with the speakers.

 

[00940]

Have a look at the ESP 33 project ? PCB are available.

 

[rsavas]

i used an old hitachi HA12001 chip that was originally used in a sansui g-7500. wired according to the spec, on a protoboard, it works as it should. used two T/E RT relays with coils in parallel, a 48V supply(LM317T adj reg) for simplicity, derived off the main o/p supply. used the transformer 7.5Vac lamp supply for the ac fail/presence detector.
many more options as others have stated. if you want all discrete look at some old pioneer designs, such a SX-x50 series recievers