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Nine channel sensor electronic switch circuit diagram

Using this circuit diagram can be designed a nine channel sensor electronic switch using CMOS components.
This a nine channel sensor electronic switch is simple to construct, consisting 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.

Circuit Diagram: 
Nine channel sensor electronic switch circuit diagram

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