Sensor switch circuit 9 channels


Posted on Feb 7, 2014

This sensor switch circuit has nine channels and consist of only three integrated circuits and some resistors. Due to high input impedance, 74HC147 allows to use of 4. 7 M resistors to create a logic level `high` to sensor inputs. When one sensor is touched, the resulting low resistance to ground circuit causes IC1 to read a logical level L.


Sensor switch circuit 9 channels
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