Transistor / MOSFET tutorial
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Uploaded by Afrotechmods on Dec 16, 2008
How to use an N channel MOSFET to turn anything on and off.
Also, remember to put a 100k resistor between gate and ground if you want your FET to stay off by default!
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Uploader Comments (Afrotechmods)
Top Comments
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5 minutes ago I did not know a MOSFET transistor from Adam. Now I think I can easily use them. Thanks. You rock.
3 months ago 6
All Comments (463)
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@Afrotechmods could you explane how voltage regulators work?
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thanks for knowledge
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because when motor will stop after running that time motor will continue slowly slowly stop so that time motor will make volt back to transister so can damage.so diod will work as break.
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To clarify for beginners, I would show the complete power circuit. For example, show that the 12 volt battery has its negative terminal connected to ground so you see a complete circuit. Makes it easier for someone wanting to play with flashlight battery powered circuits, etc.
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I should specify that this is the gate voltage. Source/drain voltage doesn't really matter.
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Not all MOSFETs will turn on completely at 5V and may overheat. Sometimes you need 9-12V. A logic level MOSFET will turn on at 5V for sure.
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Can you turn an IRF510 fully ON with only 5V? I thought that you need to use a "logic level" MOSFET (like an IRL540) to do that.
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Share the knowledge with other people Great job man!
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turn inspector gadget on, lol
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BJT Power Trannys come in the same shape ... just google the part number .
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PLease clarify for me why u need a diode to use the transistor with a motor?
xXxRadicalDesignsxXx 2 months ago
@xXxRadicalDesignsxXx Look at my video on inductive spiking
Afrotechmods 2 months ago 7
Hey, doesn't the gate have to have a higher voltage than the drain? I thought that's what I was told (although I don't have experience actually building circuits with mosfets).
Bizorke 2 months ago
@Bizorke For an N channel MOSFET Vgate has to be typically 3-10V higher than Vsource to turn on. The drain voltage does not factor into this, although it indirectly does when the FET is being driven high side. But for example, if Vdrain is 20V and you tried to make Vgate higher than that you might kill your FET.
Afrotechmods 2 months ago
What can I use to make the gadget stay on for minutes if the voltage to the transistor is 5V for only a few seconds and then drops back to 0V? Would a latching relay work?
FailsAreEpicToo 2 months ago
@FailsAreEpicToo Look at my peak detector circuit video and my comparator circuit video.
Afrotechmods 2 months ago