This is a 220V Touch Switch circuit. This circuit is used as switch which turn off and turn on the the electronic device that is connected to the 220V home electrical installations. Here is the schematic diagram of the circuit:
The electronic device that will be controlled should be connected to points symbolized with “LOAD”. To use this circuit, connect the circuit to the a 220V home electrical installations directly. This is a high current and voltage, so be careful and use adequate safety devices before doing the experiment.
WARNING: Make sure the 2.2MΩ resistor has no leakage, or a hazardous shock will hit you. [Circuit’s schematic diagram source: circuitdiagram.net]