12V Trigger Circuit For Auto Cooling Fan On

Thread Starter


Joined Nov 22, 2009
I have an amplifier that gives a continuous trigger output of 12V and 12mA when switched on. I am looking to switch on by a relay, four computer case type cooling fans each rated at 12V 1.68W max (0.14mA).

To provide switched power to the fans I was planning on using a wallwart that gives a rated output of 12V and 1A.

I'd appreciate advice on what type of relay to look for and any diode needs etc. A simple circuit diagram would be great, thanks for looking.