auto delay off indicators ?
I need a simple way to to auto cancel the signal after say 20 seconds.
I have tried using electronic devices based on the 555 timer. These work fine until the engins is started, causing the circuit to become un balanced, so its real hit and miss as to reliabilty. mainly due to the fact that the working voltage of the 555 is 5 -- 18 volts.
Can anyone suggest a way around this problem.