Relay Output Proximity Sensor

Posted on Mar 6, 2013

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
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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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