MOSFET Transistor - Complete Course for Beginners | MOSFETS

Discover the two mosfet types: depletion-mode and enhancement-mode, and learn their basic channel variants with notes on when each type is used.

Learn about enhancement-mode mosfets: zero gate voltage means no conduction, while applying gate voltage turns the device on; the gate is the control, including channel enhancement and other enhancement modes.

Explore depletion mode MOSFETs, the opposite of enhancement mode, where zero gate voltage yields maximum conductivity and applying gate voltage reduces conductivity, guiding current between drain and source with two types.

Explore mosfet advantages such as lower costs, compact size, fast switching, low operating voltage 3–5 volts, long life, and easy manufacture for integrated circuits.

Learn mosfet limitations, including damage when current is outside its limit, sensitivity to static discharge and radiation, and protection via fuses and zener diodes in a 0–30 volt range.

Explore mosfet applications as amplifiers and switches, and see how they drive integrated circuits, digital devices, motors, power supplies, voltage regulators, and cmos logic in computers and mobile devices.

Learn how to check a p-channel and n-channel MOSFET with a multimeter by testing gate-to-drain and gate-to-source resistance, noting arrow direction and probe polarity.

Test a MOSFET with a multimeter by connecting the source to the negative lead and touching the gate with the red probe, then discharge the gate to check drain-to-source resistance.

Learn common mosfet failures, identify short circuits between gate, drain, and source, and test with a multimeter buzzer, voltmeter probes, and a finger heat check to decide replacement.

Replace a failed mosfet with the same type and variant, verify by part number rather than a continuity test, and avoid mixing different mosfet types to prevent damage.

Spot mosfets on a laptop motherboard and identify an eight-pin device, along with pin numbering and the fact that pins two and three are connected together.