I need a very very simple circuit that detects if a generator producing power (20W 120VDC at max turning speed). I need the circuit that controls a relay wired to an alarm. Possibly where if power is being generated the relay is energized then when power from the generator the de-energized sounding the alarm.
My problem how do I detected the generator to drive a 6V SPDT relay?
I forgot mention this circuit will be powered by the generator meaning the supply volt can any where between 0 to 120 VDC.