How to make Single pin touch on/off mosfet touch switch

                                                     How to make mosfet touch switch

What is Mosfet

The MOSFET (  Metal Oxide Semiconductor Field Effect Transistor) transistor is a   semiconductor device that is widely used in the electronic devices for a switching and in amplifying electronic signals like audio amplifier etc.

The MOSFET is a core of integrated circuit, and due to these very small sizes, it can be   designed and manufactured in a single chip, 


  How to make mosfet Touch switch

Components lists

1. Mosfet N Channel
2. Led 3volt
3. Resister 100ohm
4. 3.7 volt Battery

Circut diagram

Touch the drain terminal and gate terminal

at the SAME time to turn the LED on.

Touch the source terminal and gate terminal at

the SAME time to switch off the LED,

The characteristics of MOSFET are

the reasoning behind this project:

The MOSFET must be completely ON for the

LED to light up, which means Vds > Vgs-Vt.

As MOSFETs are voltage-controlled transistors, they will be "short" to contact the drain and

gate terminal at the same time, thus allowing the MOSFET to be completely ON.

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