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Old 21st February 2009, 01:16 PM   #1
diyAudio Member
Join Date: Jul 2006
Default Need a little help with wiring a relay


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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Old 23rd February 2009, 11:41 AM   #2
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Old 23rd February 2009, 01:03 PM   #3
Dan2 is offline Dan2  South Africa
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Join Date: Sep 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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Old 24th February 2009, 08:01 PM   #4
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Thanks for the tip re: the diode.

Um... What kind of diode

edit: seems I need a signal diode, but what specs and where to find them?
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Old 25th February 2009, 04:50 PM   #5
Dan2 is offline Dan2  South Africa
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any diode will do
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