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Simple N-Channel MOSFET Tester Circuit
In this project, I made a simple N-Channel MOSFET tester using an LED and a tactile switch. This circuit allows you to quickly check if an N-Channel MOSFET is switching correctly. When you press the button, the Gate is triggered, allowing current to flow and lighting up the LED. It’s an essential, easy-to-build tool for electronics beginners and hobbyists to verify their components before soldering.

Components Used:
N-Channel MOSFET (Tested via G-D-S terminals)

LED (Green indicator)

Resistors: 1kΩ (for LED protection) and 10kΩ (Gate pull-down)

Push Button (Tactile switch)

Battery: 3.7V Li-ion battery

Connecting wires

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How It Works:
The MOSFET acts as a switch in this circuit. The 10kΩ resistor acts as a pull-down, keeping the Gate (G) at 0V so the LED stays off by default. When the push button is pressed, positive voltage is applied to the Gate, "opening" the channel between the Drain (D) and Source (S).

LED Lights Up: The MOSFET is functional and switching properly.

LED Stays Off/Always On: The MOSFET is likely faulty or shorted.

tags
MOSFET Tester, How to test MOSFET, N-Channel MOSFET, Electronics Projects, DIY Electronics, Simple Circuit, MOSFET working, Electronic Components testing, Electronics for Beginners