I thought I would post this here for others to think about building.
I needed a 12 volt trigger relay to get power linked to two processors.
Neither processor had 12v trigger inputs.
So after reading elsewhere about simply solid state relay (SSR) devices I built my own.
If you look at the picture, it is housed in a box about the size of a kid's shoe box.
The power lead (from wall power socket) comes in from the left and the red HOT line is cut in two. It then connects to pin 1 of the relay and the other side is connected to pin 2 which then goes to the outlet side (female plug).
If you see the pic the 12 volt trigger is connected and LED is lit showing the power is on meaning anything plugged into the power socket is now supplied with power.
Turn off the 12v supply and everything is turned off.
I have connected this to my 12v trigger on my receiver and it works perfectly turning on/off my processors when the receiver turns on/off.
The relay cost $10 and the box I had lying around along with the power cord.
If you need a 12 volt replay triggers to get other devices working on/off it's a simple build. The SSR relay is a Fotek SSR 25DA.