In this straightforward Touch Switch circuit we have utilized clock IC 555 worked as ON and OFF. By utilizing this circuit you can kill ON and a gadget by just contacting the Touch Plates or metal utilized as sensor. In the event that the touch plates are put at a helpful spot, we don’t require to move from our area to kill on and the gadget. The significant element of this circuit is that we won’t get any electrical stun which we now and then get while utilizing the ordinary switches.

Parts Required

555 Timer IC

3.3 Mω Resistor (1/4 Watt)

1 Mω Resistor (1/4 Watt)

1 Kω Resistor (1/4 Watt)

Bulb with holder (normal or CFL)

5V Relay

BC547 NPN Transistor

1N4007 PN Junction Diode

Circuit Diagram

Contact switch circuit

Circuit Design

Plan of the Touch ON and Touch OFF Switch circuit is extremely basic. We have associated the stick no 8 and 4 of the 555 with VCC supply and stick 1 is associated with GND and 5V separately. Stick 2 of IC is pulled HIGH utilizing a 3.3 Mω Resistor and Pin 6 is pulled LOW utilizing a 1 Mω Resistor.

As appeared in the chart two touch plates are associated. If there should be an occurrence of the touch to ON plate, one end is associated with stick 2 and opposite end is associated with – supply. Additionally, one part of the bargain to OFF plate is associated with VCC (5v) and the opposite end is associated with Pin 6.

Working of the Project

Subsequent to Connecting the circuit according to the circuit outline and apply the 5v power supply.

Contact the “ON” plate with your finger and to mood killer the gadget , contact the OFF plate as appeared in the circuit outline.

As power supply is connected to circuit, the gadget associated through the hand-off (we have associated AC bulb) stays OFF. Presently on the off chance that we watch the circuit chart, Pin 2 of 555 IC is pulled HIGH and Pin 6 is Pulled LOW.

As we contact the ON plate, voltage at Pin 2 of the 555 IC turns out to be LOW. As Pin 6 is as of now LOW, the yield at Pin 3 turns out to be HIGH.

This is associated with the Relay through the Transistor BC 547, the Transistor will be turned ON and it will enact the Relay and gadget gets exchanged ON.

Now voltage at stick 6 of 555 ic is zero as it pulled LOW of course and voltage at Pin 2 of IC is HIGH.

Presently, as we contact the OFF plate, Pin 6 is provided with + supply for a short time and thus, the yield of IC will turn out to be LOW.

This will mood killer the transistor and deactivate the hand-off. AS result, the gadget will be turned OFF.


A basic Touch to ON and Touch to OFF Switch Circuit can be utilized to control straightforward LED without utilizing any hand-off.

In the event that we need to control the AC apparatuses, at that point we need to utilize transfer with this circuit.

Any AC machine can be constrained by suing this circuit