MOSFETs and How to Use Them | AddOhms #11


MOSFETs are the most common transistors used today.

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They are switches that can be used an Arduino, BeagleBone, or Raspberry Pi. This is part 2 of a 2 part series, which covers MOSFETs. (Part 1 Covered BJTs).

When it comes down to it, MOSFETs are pretty complicated devices. This video will cover the basics of what you need to use them in your circuit, including calculating if you need a heat sink or not.

Learn what they are and how to use them.

Part 1 (BJTs):

Show Notes:

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  1. When looking at a datasheet, do NOT use the value of Vgs in the section "Absolute Max." This section is for conditions that will damage the MOSFET. More information here:

  2. If I feed a pure sine wave of 50 hz at the gate, will it re-produce the pure sine wave at the output, in much the same way a transistor would if dealing with similar input signal? Reason I ask, is I'm trying to design a pure sine wave inverter. So far, have only seen Mosfets in inverters doing high frequency pulse switching, be it pwm for square wave or spwm for pure sine wave, but I'd like to build a low freq: 50 hz version to hook to a 12/24 to 240 volts transformer at 50 hz (our UK system). It seems low frequency inverters can handle PF better. Thanks for the helpful tutorial.

  3. Hello James, Now I'm repairing a Speaker Amplified.
    Manufacturer: Monster, Model Number: Rocking Roller 3, This Item is not Power On.
    I Review the Power Supply and the printed circuit of the board were burned also, part of a resistance that is connected to the Drain of a Mosfet, The part number of the Mosfet is ISA07N65A, as it burned part of the resistance I do not know what its the value of there, I already checked in the manufacturer's page, but does not show the diagram, to see the part. could you help me to know what is the burned resistance?
    The part number of the power supply is KA1658 Rev. 1.0

  4. Around 2.19 minutes you have drawn the wrong symbol for enhanced MOSFET. Should have a dotted line between drain and source otherwise good presentation.

  5. Thank you sir, I was actually using a mosfet driver from microchip to drive some mosfets then ran across your video about the FQP30N06L being logic level, you just reduced my parts count by 2

  6. Heya! How do i learn how to turn my mosfet off at say 10 000 rpm? I got a super fet and its capable of nano second switching times. How do i engineer the curcuit correctly for high frequency operation? ☺ im used to transistors turning themselves off! Ha. So that aspect of staying on without the drain resistors is new to me. Can you help me? 🙏🙏 im workin on a clean energy device which will be good planet earth so i want to figure this out correctly 😀 show me the way ! Light up my path brother! 😎

  7. Great video!
    I have been watching some early videos about the invention of the transistor and 'point contact' transistors and they all seem pretty complicated -the MOSFET by comparison seems very simple. Maybe I am just thinking this because its seems more binary in nature. The impact of a 'field' on conductance seems pretty intuitive.

  8. The instructional part I was interested in this video was from 2:40 up to about 3:35. The rest of the video probably was a guide for technical use of electronic hobbyists, practitioners or enthusiasts. I would probably get there maybe in some future projects of mine but my interests on using MOSFETs would be far more in complex electronics purposes like how to use them with higher amp/voltage motor requirements or will they work on induction motors, etc. Thanks anyway for this informative video.

  9. Nice video. Well thought out. Clear and practical. I like the introduction of the data sheet.

    Practice hands on learning

  10. That's not how the joke goes. It's 2 men walk into a bar. 1st man says "I'll have a glass of H2O The 2nd man says i'll have some H2O too but with a twist of lemon. 1st man dies from trying to do too much 2nd man lives on , still, because he spit it out for being too bitter.

  11. Hi if you are king enough to help me determine what is the best substitute for CSD17556Q5B, the max power dissipation is 3.1watt for this. What should be most relevant, Is Max power dissipation matters a lot is it how hot the mosfet gets ?


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