Let's say that I want something to turn on at a specific voltage. How can I do that? I know I need a relay but what about the trigger switch itself?

 

I like to use an LM431 in these applications as long as the switch on voltage is above 2.5 volts. Then use the LM431 to control the relay.

Regards,
BigMoose

 

What do you want to have??? Are you taping off ur TPS signal for nitrous or something??? Jack someones 2nd gen ZEX module and there you have it... It's not like the old style that is just plug and play.. With the 2nd gen you can hold it at a certain voltage and program the relay to switch on every time you hit that particular voltage.

 

HaHa, something like that but I don't think anyone is willing to part their ZEX module from the kit itself.

 

I'd use either a Transistor or a Zenor Diode..