Relay Output Proximity Sensor

  
Ql is used as an oscillator around 300 kHz. R9 is set so that the oscillator just begins to run. An object ne
Relay Output Proximity Sensor - schematic

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.




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