LogicalZero
Hacked case: relay
My old PC case, featuring some practical hacks. Pictured here is the relay unit inside the case, powering the monitor and external speakers when the computer is on. The relay is a bulky 12V DPDT switch. The two switches are ganged to handle greater current, but I think they could each have handled the load. A fuse makes doubly sure.
Not seen is the 12V input to the relay. It's connected to a Molex from the power supply like a fan. A little zener diode connects the positive and negative to ground off any back current when the relay switches off.
Hacked case: relay
My old PC case, featuring some practical hacks. Pictured here is the relay unit inside the case, powering the monitor and external speakers when the computer is on. The relay is a bulky 12V DPDT switch. The two switches are ganged to handle greater current, but I think they could each have handled the load. A fuse makes doubly sure.
Not seen is the 12V input to the relay. It's connected to a Molex from the power supply like a fan. A little zener diode connects the positive and negative to ground off any back current when the relay switches off.