This is a design circuit of relay output proximity sensor that can be used in oscillator. This is the figure of the circuit;
Q1 is used as an oscillator around 300 kHz. R9 is set so that the oscillator just begins to run. An object near the antenna will load the circuit down, and stop the oscillations. This is detected by bufferQ2, diodes D1 and D2, and this activates relay driver Q4, which operates the relay. [Circuit diagram source: Seekic.com]
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