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Touch ON Touch OFF Switch Circuit Using MOSFET

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Touch switch circuit

ON OFF Touch Switch Circuit Using MOSFET.

This is An Effective, Easy, Simple And Very interesting Circuit. Only One MOSFET and One Relay is Used in this Project. 

Use 9v DC Supply Voltage to the circuit. 

When We touch on Ground and Gate terminal Then Appliance is Switched OFF And When We touch on The Gate and Supply – Then Appliance is Switched ON. 

Touch Plate made of Two Plates Separated by Small Gap.


Touch Switch For ON OFF Circuit Diagram


Introduction to MOSFET

MOSFET stands for a metal-oxide-semiconductor field-effect transistor. It is a special type of field-effect transistor (FET).

BJT is ‘current controlled’, the MOSFET is a voltage-controlled device. The MOSFET has “Gate“, “Drain” and “Source”  terminals instead of a “base”, “collector”, and “emitter” terminals in a bipolar transistor.

Mosfet symbol

By applying a voltage at the Gate, it generates an electrical field and makes conductivity of current flow through its between Drain and Source, and there is no current flow from the gate into the MOSFET.

 A Resistor is Required  At the Transistor base for limiting the current But In MOSFET without resistance at the gate, it can work well. Usually, MOSFET has much Load Power than Transistor.


IRFZ44N is a Fast  Switching Standard Type MOSFET.

MOSFET AS SWITCH— To use MOSFET as a switch, We have its gate voltage (Vgs) higher than the source. If you connect the gate to the 0v source (Vgs=0) i.e Ground. Then it is turned off.

Gate Voltage < Source Then OFF

Gate Voltage > Source Then ON

In this Circuit—-

Gate +( +Supply) = ON

Gate + (- Supply) = OFF


Demo Video Of This Project… Don’t Forget To Watch It.

Must Read Remote Control Switch Circuit For ON OFF Light/Fan etc

Very Simple Touch ON And Touch OFF Switch For Appliance. In This Circuit, A N-Channel MOSFET IRFZ44N is used As Switching Element. And a Relay is Connected to Give the supply to the Load Such as Ligh Bulb, Fan Etc



CAPACITOR 0.1UF (104)-1

DIODE 1N4007-1


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