I'm trying to design a switchback circuit (Type 2) to control turn signals on a pre-war MG car. (Marker LEDs on and when turn signal is activated, markers go off. When the turn signal is deactivated, the marker comes back on after 1 or 2 seconds.) It should be fully electronic with no relays due to vibration. I have a circuit working for negative ground, but the challenge has been to get it working in either positive or negative ground, since I want to use it in two of my vehicles which have different polarities.
I tried using bridge rectifiers ahead of the circuit, but that does nothing but kill the delay. I know this is possible since I have seen an LED bulb which does exactly the right thing. However, those bulbs are too big to fit in the light housing.
Can anyone post a suitable circuit diagram.
Many thanks in advance.
I tried using bridge rectifiers ahead of the circuit, but that does nothing but kill the delay. I know this is possible since I have seen an LED bulb which does exactly the right thing. However, those bulbs are too big to fit in the light housing.
Can anyone post a suitable circuit diagram.
Many thanks in advance.
