555 Touch Switch Circuit

This circuit uses a 555
timer as the bases of the touch switch. You can learn more about 555
timers in the Learning section on my site. When the plate is touched the
555 timer is triggered and the output on pin 3 goes high turning on the
LED and the buzzer for a certain period of time. The time that the LED
and the buzzer is on is based on the values of the capacitor and
resistor connected to pin 6 & 7. The 10M resistor on pin 2 causes
the the circuit to be very sensitive to the touch.

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