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Electric OU: Supplement: IRFPG50 N-Channel MOSFET Gate Threshold Voltage 

TinselKoala
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Here I show the simple DC Gate Threshold Voltage test for the IRFPG50 n-channel MOSFET.
It is pretty easy to see that a voltage fluctuating around 4 volts on the gate is sufficient to get partial turnon of the IRFPG50 power mosfet. Quite a bit of turn on, in fact. But of course when the mosfet is only partly on, it has a high internal resistance and so it must dissipate more power within itself. The transistor in this test became uncomfortably warm to the touch.
This of course once again soundly refutes yet another silly claim made by Rosemary Ainslie and Donovan Martin in their demonstrations, forum posts, experiments and papers.
(Donovan Martin certainly knows better and can be heard explaining to Ainslie the gate threshold turnon of the mosfet in the "swan song" clip.... but he permits his name to remain on the papers which make the absurd claims implicitly and explicitly.)

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22 окт 2024

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Комментарии : 7   
@TinselKoala
@TinselKoala 11 лет назад
Those little blue 3-position terminal strips are really handy. I'm all out of them, have to get more from my supplier. I think they are a Velleman product, actually. They work great as sockets for TO-247 type packages, and also for general purpose hookups like power inputs, etc. They have nice and beefy contact blocks and PC board pins and they also can be stacked side-by-side with little interlocking dovetails. I don't think I've managed to fail one in years of using them.
@RoyAndrews82
@RoyAndrews82 8 лет назад
LMAO !!!! Wow.. This is nuts.. I really like the part where you said, some mosfets will actually turn on at 3.5 volts. That was so funny !!
@TinselKoala
@TinselKoala 8 лет назад
You have a strange sense of humor!
@RoyAndrews82
@RoyAndrews82 8 лет назад
TinselKoala So do you. Why do you think I thought it was so funny?
@high1voltage1rules
@high1voltage1rules 11 лет назад
Hey' yeah iv done this circuit before. And it does work well. Iv used it for driving motors. But I do have a heatsink on the mosfet. Lol. All mosfets do act differently with gate voltage for turn on and off! Thanx for sharing. Thumbs up☆
@platinumphonesandcomputers
@platinumphonesandcomputers 4 года назад
RU-vid is so fake, they fail to recommend useful videos like this and recommend stupid DIY videos. Thanks man
@TinselKoala
@TinselKoala 11 лет назад
This is not a good way to control the speed of a motor! The reason is that when the mosfet is only partially on, its resistance is high. This means that a lot of power is wasted in heating the mosfet, rather than running the motor. Much better is to use a "Poor man's PWM" system by making a simple 555 timer with freq and duty cycle control, but with 10v square wave output. Then use that to control the mosfet that is running the motor. This way you turn the mosfet fully on, but in little bursts.
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