Published:2011/3/23 3:02:00 Author:Jessie | Keyword: Liquid level alarm, integrated circuit | From:SeekIC
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 stop because the effects of shunt capacitance, output gradesexchange the switch state.
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