Moisture Detector

  

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Inside:
Air-Gas Detection Circuits / Sensors Detectors Circuits
A bar-graph LED driver is used to drive 10 LEDs to give a relative indication of moisture. The moisture probes are connec
Moisture Detector - schematic

ted so that electrical conductivity due to moisture tends to forward bias Ql, providing a dc voltage at pin 5 of Ul that is proportional to leakage current. Ideally, the probes should be made of stainless steel.

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