This is a help request. Could someone possibly come-up with some advice regarding the control of devices using the ubiquitous 12 volt trigger.

I'd like to automate the switch-on of an AV amp and an Epson projector with the raising/lowering of a motorised screen.

The amp has selective 12 v triggers out based on input selection, and no 12v trigger in. The projector has a 12v trigger out, and again no 12 v trigger in. The AV amp and the projector can be made to interwork via infa-red, it is the screen that is the problem.

I'm therefore looking for a device that would accept the projectors 12 volt trigger, and momentarily (1 second or so) close a contact when the trigger becomes present. When the trigger drops, close a different set of contacts, again for 1 second or so.

Wonder if anyone has any ideas?


Thanks anyway for reading.

Rgds / Ed

My garage door used to be opened by a remote control or a 12v push button you press momentarily.

Umfortunately the remote control receiver failed but the push button worked. I was able to buy a simple remote controlled switch which simply connected in parallel with existing switch and I could control door by remote control. Perhaps this might help?

See website for details

http://www.quantekshop.co.uk/gdo230.html