The 74HC/HCT4067 are high-speed Si-gate CMOS devices and are pin compatible with the 4067 of the "4000B" series. The 4067 contains sixteen bidirectional analog switches, each with one side connected to an independent input/output (Y0 to Y15) and the other

This sensitive commutator is based on IC1, one operational amplifier with a high input impedance. When the finger touches Se1 sensor, C2 is charged, this will cause the linear dropdown of the IC1 output voltage. When we touch Se2 sensor