Need a little help with wiring a relay

sensibull · 21st February 2009, 01:16 PM

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?

sensibull · 23rd February 2009, 11:41 AM

Anybody?

Dan2 · 23rd February 2009, 01:03 PM

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.

sensibull · 24th February 2009, 08:01 PM

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?

Dan2 · 25th February 2009, 04:50 PM

any diode will do

21st February 2009, 01:16 PM	#1
sensibull diyAudio Member Join Date: Jul 2006	Need a little help with wiring a relay 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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23rd February 2009, 11:41 AM	#2
sensibull diyAudio Member Join Date: Jul 2006	Anybody?

23rd February 2009, 01:03 PM	#3
Dan2 diyAudio Member 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.

24th February 2009, 08:01 PM	#4
sensibull diyAudio Member Join Date: Jul 2006	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?

25th February 2009, 04:50 PM	#5
Dan2 diyAudio Member Join Date: Sep 2005	any diode will do