Door touch switch circuit (CD4069) schematic

  
CMOS gate has a high input impedance, resistance by human contact, you can make it the input level is changed, triggering gates toggled.

The circuit is the use of this feature of its composition one case touch lamp switch, the circuit as shown in FIG. Circuit consists of a six-CD4069 inverter and a small DC relays, CD4069 three inverters Dl ~ D3 series combination of resistance and capacitance coupled through the feedback element, both to ensure signal transmission, but also to achieve a locking circuit.




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