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This is helpfull design that I saw in Elektor. It is most simple circuit, low number of elements, works great....

This is the schema

Mains delay

You can use 12v or 24v relays, only some components will have to change. I have used used 56 instead of 10 for resistors R4-R7, so that current is limited to ~1A. Because I use 24v relay I had to change C1 to 220nF. Best thing is if fuse blows, everything will shut down.

Here are to simulations that I did for Diyaudio, for someone that would live in UK where they have 240Vac

254Vac

 

216Vac

Here is my delay...

delay

Read more here

Download PCB here

Application Note on bridging audio amplifiers

A discussion on bridging audio amplifier circuits like LM3886. Includes a schematic to drive a matched pair of amplifiers in a bridged configuration, power supply considerations for LM3886 and TDA1514 power amplifier circuits-especially in bridged pairs.

Application Note on parallel-bridging LM3886 audio amplifiers

How to make it loud - real loud. (230 watts rms into 8 ohms without clipping from 4 ICs. How to match LM3886s for parallel operation, then bridge the matched parallel banks. If you are not familiar with bridging amplifiers (BTL configuration), read the Application Note on bridging listed left in article Application Note on bridging audio amplifiers.

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