pulldown-mosfet

This circuit demonstrates a pulldown configuration using an N-channel MOSFET (2N7002) as a low-side switch to control an LED. V1 (5V) supplies the main voltage. S1 is a push button that controls the MOSFET gate. R1 (1kΩ) is a pull-down resistor to keep the gate LOW when the button is not pressed. Q1 (2N7002) is an N-channel MOSFET acting as a switch to ground. R2 (1kΩ) is a current-limiting resistor for the LED. When the button is pressed, the gate receives 5V → MOSFET turns ON → current flows to ground → LED turns ON. When the button is released, the gate is LOW → MOSFET is OFF → no current → LED is OFF. This configuration is commonly used in digital logic systems where a MOSFET sinks current to ground when activated.