Liquid level alarm circuit which controlled by integrated circuit promixity switches

  
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Integrated circuit input side has a oscillating circuit,it`s oscillation frequency depends on external components L1, C1 and sensor`s equivalent capacitance, the latter size increases with liquid immersion. Oscillating signal add on the threshold switch after rectified, then control digital output level. When the sensor S dipped into the liquid, Oscillation..
Liquid level alarm circuit which controlled by integrated circuit promixity switches - schematic




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