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9 channels sensor switch circuit

This 9 channels sensor switch circuit diagram is designed using CMOS components.
This 9 channels sensor switch circuit 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.
If several sensors are touched simultaneously, priority encoder delivers 4-bit code corresponding to the sensor with the highest number.

Electronic Circuits: 
Circuit Diagram: 
Sensor switch circuit using 74HC147

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