This is the Simple Relay Output Proximity Sensor Circuit Diagram. In This Circuit Ql is used as an oscillator around 300 kHz. R9 is set so that the oscillator just begins to run. An object ne ar the antenna will load the circuit down, and stop the oscillations. This is detected by buffer Q2, diodes Dl and D2, and this activates relay driver Q4, which operates the relay.
Simple Relay Output Proximity Sensor Circuit Diagram
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