Mains-operated Capacitive Sensor

  
This very simple circuit acts as a high sensitivity capacitive sensor. Lamps and/or Buzzers are operated at half the mains supply voltage when a part of the human body comes in contact with the sensor or approaches it at a close distance. The circuit can be used as an alternative to the Door Alarm or Capacitive Sensor circuits, already available on this website.
Mains-operated Capacitive Sensor - schematic




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