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.
Door touch switch circuit (CD4069) schematic - schematic

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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