This electronic touch switch circuit is a touch switch ( on/off ) activated by skin resistance of finger. When the finger touch the on contact the a small current is delivered through skin to transistors to turn on the circuit .
The electronic touch switch circuit require few external components ( four transistors and four resistors ) and is very simple do build even for beginners .
The touch switch circuit remains on until the finger touch the off contact . This electronic touch switch designed with transistors require a 6 volts power supply circuit .