I am trying to connect an SSR to a DC voltage source that is either at 2.9v or 12.3v. I want to have the SSR switch on when the DC source is @ 12.3v and off when the source is at 2.9v.
I can't seem to find an SSR that has an OFF voltage in the proper range.
The DC source is computer controlled and monitored (voltage and current), so simple voltage reduction methods like a resistor may not work.
Any thoughts on how to solve the problem? The solution needs to be simple an robust as it is an automotive application, so there are vibration, heat and moisture issues to contend with.