Touch Sensor Using 555 Timer Ic Circuit Diagram. Whenever we touch the conductive plates of the touch sensor the 555 timer is triggered. This is the circuit diagram of a small touch plate controller using ic ne 555 this circuit is ideally useful for making touch operated doorbells buzzers toys etc which when touched on the touch plate operates the relay for a preset time and then turns off automatically.
An explanation of how this circuit works is also included i. Comment on this circuit or view the electronic circuits community forum. The circuit can be made 100 times more sensitive by adding a transistor to the front end as shown in the diagram below.
The led will be on for the time during which the trigger is present.
Using this circuit you can also control ac or other high load appliances by coupling the output of 555. Whenever we touch the conductive plates of the touch sensor the 555 timer is triggered. The circuit can be made 100 times more sensitive by adding a transistor to the front end as shown in the diagram below. In the second circuit two touch plates are provided and the resistance of your finger changes the voltage on pin 2 or 6 to toggle the 555.
