This is for in-vehicle purposes. Would like the circuit to sense when on-board voltage exceeds say 13V, which means the engine is running and the alternator is spinning, and then provide power to another low power (<1A) circuit.
When the engine is not running, the sensing circuit would cut the power to the secondary circuit, and not use much power for itself while the vehicle is parked.
Any ideas for a circuit that does not use any purpose built ICs?
When the engine is not running, the sensing circuit would cut the power to the secondary circuit, and not use much power for itself while the vehicle is parked.
Any ideas for a circuit that does not use any purpose built ICs?