great.. have done that too, I built the circuit in a simulator too and fiddled with it to put in a switch which will give me the options of having the invertor always-off, always-on, timed by cutting the 12v line to the 555 chip, disconnecting the RST pin & having it like it is now (respectively, for each option...) it seems to work in the sim, is there any reason why I shouldnt do it this way?
Also, I'd like to add 2 LED's red & green, the red one should be on when the ignition key is on, and the relay is off, the green one should come on when the relay turns on, but the red one should switch off.. how difficult would it be to add this?
Many thanks,
Rob