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Sunday, 6 January 2019

Simple Touch Sensor



Today in the article I will discuss Simple touch sensor/ Transistor Touch sensitive circuits. Here I will discuss n channel MOSFET touch-sensitive circuits. MOSFET has 3 pins gate drain and source. The point gate is used for turning on and turning off the MOSFET. Basically, we use a PWM signal for controlling the MOSFETs. But here we are using our Hand as a resister which can activate or deactivate the MOSFET.

Needed components for Simple touch sensor:

  1. N-channel enhancement type MOSFET IRFZ44N
  2. 1K resistor Click Here
  3. 1 LED Click Here
  4. 9v Battery Clip Click Here
  5. 9v Battery  




Watch the YouTube video:

Here is the YouTube video from Creative Creator, This will help you with more clarification.




Schematics of the Circuit for Simple touch sensor:


How the simple touch sensor circuit works?


  1. MOSFET has 3 pins gate drain and source. The point gate is used for turning on and turning off the MOSFET. Basically, we use a PWM signal for controlling the MOSFETs. But here we are using our Hand as a resister which can activate or deactivate the MOSFET.
  2.  If we touch the gate Pin and the Vcc then the current flows from our hand to the gate pin. There it suddenly activates the MOSFET. And the current flows from drain to source.
  3. In the MOSFET there is an inbuilt capacitor this took the charge and stores the energy. The current will flow from drain to source as long as capacitor stores energy.
  4.  Now if you touch the gate Pin and the GND Pin then the stored capacitor discharges and the current flow become lower. There will be higher resistance between drain and source.
  5. So, there will be no flow between drain and source.





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That is how the circuit works.

You can also like our another article about Simple LED Blinking Circuit 🤗

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