I am building a wind generator and am looking for a circuit that will close a relay to energize a 12 volt linear actuator to stop the wind mill. I need this circuit to close the relay at 300 RPM's. I mounted a magnet on the wind generator that sweeps past a pickup coil and at 300 RPM's, I get a 20 volt pulse and 200 ms between pulses. I can vary the amplitude of the pulse be changing the distance between the magnet and the pickup coil. I looked at using a 555 with a RC circuit, but not sure if this would be reliable enough. I was also thinking about using some kind of counter circuit. If the circuit counts more than 5 pulses per second, which equals the 300 RPM's, the circuit would energize the relay and actuate the brake. The counter circuit would also have to reset every second. Not sure if all this makes any sense, but if anyone has any questions, I will try to answer them. Any comments or ideas are appreciated.
Wanabee
Wanabee