Reply to thread

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Message: <blockquote data-quote="marantz123" data-source="post: 1180839" data-attributes="member: 16849">You could work around a simpler circuit for this. Also consider using a solid state relay, they work well. I would look at a prototype as follows. The 10k resistor provides a tiny static load and also serves as a discharge path when powering down. The electrolytic capacitor smooths the switching behaviour and builds in a bit of time, taming any erroneous switching and allows your audio signal to the power amp time to stabalise before power comes up on the power amp. The flyback diode (likely also already built into the 12V trigger output on the AV amp) provides a discharge path when the voltage collapses on power down of the relay coil. Suggested values may need to shift a bit based on testing and needed performance.Edit: could add a series resistor in the positive line (between the 10k resistor  and the capacitor) to create a defined time delay to ensure that the power amp switches on after the AV amps audio signal output has stabilized.If relay contact switching noise is a problem (conventional relays) then a calculated  250V - 1000V X2-rated capacitor value could be used across the contacts to compensate for any contact bounce. Solid state relays minimize this issue.</blockquote>