This circuit uses a 555 timer as the bases of the touch switch. 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.
Circuit Diagram
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBaBdUHiZPBJAJZXy21LwNtga6ncaiXk9fCSbe_3Umh0z7Nm5VYBkOvVSMB7kdvb1oDre6UgLCZBdMuH52q6PzblXimBXJTCcXU6BcXtPvpULhaQmTUO7vlAFqxmt9n3sGF4pWJURsTmiH/s1600/touch.gif)
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