Solder one of the wires to the output of the control circuit and solder the second wire to the ground (negative terminal) of the control circuit. Take two wires and strip the insulation off of the ends. But you can also use individual 12-10 gauge quick disconnect connectors.įirst we need to connect the relay to the control circuit. These typically mount to a special automotive relay socket. Once I was happy with how the circuit was working, I soldered it onto a printed circuit board. To test the performance of the circuit, I connected an LED to the output. When assembling the circuit, I first prototyped it on a breadboard. The control circuit is powered by a 12 volt battery pack. This prevents the control circuit from rapidly turning on an off. I added a diode, a capacitor and a resistor to the input of the control circuit to help filter out noise and to smooth out the pulses from the radio receiver. This transistor is used to turn the relay on and off. So the output of the OP AMP is connected to a power MOSFET. The OP AMP can not output enough current to activate the relay by itself. However larger relays like this also require more current to activate. I am using an automotive relay so that it will be able to switch high currents (up to 40 amps). When the output voltage of the receiver goes above this reference voltage, the output of the OP AMP goes HIGH and activates the relay. These resistors may need to be changed to calibrate for your receiver. Two series resistors (3.3kohm and 1kohm) form a voltage divider which sets a reference voltage that the OP AMP uses for comparison. The control circuit that I designed for this project uses a 741 OP AMP to monitor the output of the receiver.
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