My neighbor's electric gate quit. The control section of the board is wiped out. The power side is fine. I have already figured out how to repace all the defunct electronic controls with a mechanically held relay which can perform all the functions that were previously done electronically via 4 ordinary 12 volt magnetic control relays. The only problem is the signal from the receiver which is activated by the hand held one-button transmitter. It works thusly: There is a constant 3.5 volts DC on the circuit. When the transmitter button is depressed the voltage drops to 1.5 and pulses which I am guessing is square wave DC. I don't have a scope. Then upon button release the volts drop to zero and rise again to continuous 3.5. The continuous 3.5 is useless because it is there all the time. I need to either transform or amplify the 1.5 pulsing to 12 volts AC or preferably DC, or utilise the drop to zero and back to 3.5 to end up with a 12 volt one-time pulse. I know a mosfet would work if I had a recognisable 5 volt or so signal but I don't. I have continuous 5 and 12 volt DC to work with outside of the signal circuit.
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