I'm new to circuit design but I'm trying to design a circuit for a power antenna that will send a 5 second pulse whenever it detects a a wire has gone from off-on or on-off.
So far I have designed the circuit below. 12V is is always on and 'T' is the 12V trigger from the radio that is on whenever the radio is. It uses the relay on the left to detect the trigger wire from the radio changing state, the brief moment when the relay switches over and is not making contact with anything, it will make the NOT gate pulse on which will be extended to ~5 seconds or whatever by the time delay relay circuit at the bottom which will run the motor relay.
As you can see I'm more familiar with electromechanical and relay logic and was wondering if anybody can provide a more elegant solution preferably using solid state?