pullup-mosfet

This circuit demonstrates a pull-up configuration using an N-channel MOSFET (2N7002) to control an output line via a mechanical switch. V1 provides a 5V supply. R1 (1kΩ) acts as a pull-down resistor on the MOSFET gate to ensure it stays off when the switch (S1) is open. S1 controls the gate voltage. When pressed (closed), it connects the gate to 5V and turns the MOSFET on. Q1 (2N7002) pulls the output line to ground when activated. R2 (1kΩ) is a pull-up resistor that keeps the output line HIGH when the MOSFET is off. The LED (output_1) lights up when the MOSFET conducts and pulls the output LOW. This configuration is useful for implementing digital logic with pull-up behavior using a simple switch and MOSFET as a grounding element.