Need a little help with wiring a relay

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sensibull

Member
Joined 2006
Hello,

This might sound a little whacky, but I'm building a music server inside of an old Philco radio case. This is the third I've made actually, but I'm trying to get a bit more sophisticated with my wiring.

Inside the shell will be a mini-itx based computer and an amp. I only want one power cord and one power switch and I want the amp to power on with the computer.

Can I do this by wiring in 120vac relay with a 12v coil and using the (unneeded) 4pin molex on my PSU as the trigger? I have a rotary momentary switch to power on the computer. Would I would just need to wire the mains power into a block and route the hot, ground, and common wires properly from there?
 
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Dan2

Member
Joined 2005
it will work, but chances are that the amp will turn off after the computer does which might make a noise.

just remember to put a diode in parallel with the coil, reversed, this will protect your PSU against the reverse voltage spike that the coil produced at switch-off.
 
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