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mosfet fundamentals (static test P-N schematic)

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Uploaded on Sep 6, 2011

The video shows some fundamentals about N and P MOSFETS and how to test them in a static test. Of course a dynamic test can be done with a squarewave generator connected to the gate, the load in the (drain) lead and an oscilloscope (gate-ground) to study how the Mosfet drives the load. The great advantage of a Mosfet: it can be driven with more or less "static" voltage changes on the gate. So they can be driven on the gate "with a touch of your finger". Most important properties of a MOSFET: "on" resistance, maximum working voltage (safe), maximum and usable current to drive the load, how quick it switches on its gate (change states), input capacitance. Please note: a completely open and free "hanging" gate is vulnerable and gives unpredictable switch effects. A touch of your finger can drive it. So make the gate slightly negative (N-Fet) or positive (P-Fet) by connecting a high value resistor (1 M or so) from the gate to ground. After that drive it with positive (N-FET) or negative (P-Fet) pulses (e.g. squarewaves, a multivibrator). More (beginners) circuits in my books, available on the Lulu website (author Ko Tilman). Please note: all circuits in which a MOSFET drives a high voltage transformer are dangerous and can be lethal.

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More links to video’s from all kinds of electronics are in my channel trailer “Radiofun232 on You Tube” in the “comments” section.

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