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- เผยแพร่เมื่อ 25 ก.ย. 2024
- NOTICE THERE IS AN ERROR IN ONE OF THE SCHEMATICS: Q2 in the drawing has the collector and emitter reversed. The emitter should be grounded not the collector.
In this video I show how to use N-Channel MOSFET's. This video mostly pertains to 12 volt systems but I talk a little bit about using higher voltages. I also show how to use a MOSFET with a microcontroller.
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You can also follow me on Twitter here: / eman2000_yt - วิทยาศาสตร์และเทคโนโลยี
I watched 3-4 other videos prior to finding this one, I was about to give up and assume my life of crime. Thanks to you, I won't have to resort to stealing gum from underneath tables at public libraries.
If you go to your local jail booking room you can get fresher gum
A really nice and simple instructions video. And not so fast talking. Many of this kind of videos is so fast talking and especially for us that don't use English as first language it's really hard to keep up with. U just got yourself a new subscriber. Hope to see more videos like this.
Thank you, glad you liked it.
Thank you, very helpful. I needed to understand how one was working in a circuit i'm trying to build.
Simple with diagrams and practical examples. Thank you very much!
Great video. I think Q2 in your drawing has got the collector and emitter reversed though. The emitter should be grounded not the collector. just saying. Keep up the good work!!!!
Thank you! and yes you are right. I am planning on remaking this video when I get the chance.
Q2 collector should go to Vcc ? I believe .
Good job, circuit explained very well.
You may want to check out TTL NPNs like the IRLB3813, IRLB8743, and IRLB3034. The Rds(on) @ 4.5V is so low that they can drain 10A without getting warm!
Thank you! As a beginner this heped me a lot!
Can you help my sir?
I have unusual problem I have positive voltage regulator insude my dashboard and I have 4 pin gm ignition module.
So my problem is my E core type ignition coil does not get enough voltage on engin start up when its cold so I do have gm R terminal bypass wire on my starter selenoid.
I tryed to use that pin with a diode.
But my fuse pops .
Aperantly bouth my ignition module and linear dashboard voltage regulator are polarity sensitive.
So can I fix some how that problem?
Can I replace my linear voltage regulator with somthing ells?
I also wanted to make magnet alternator to charge my baterry faster I wanted to keap my bridge rectifier what shuld I use to make dc voltage regulator? Prevent my baterry from over charging?
I have 3rd problem for some odd reason my blinker relay goes havoc on my .
And my engin refuse to stop when all 4 blinkers are turned on it is a 3 pin flasher relay can I solve that backcharging problem with a diode?
And where do I put that thing on the 3 pin flasher relay?
My car does some real odd things so I was wondering is there some ground protection circuet who can prevent back charge?
Thanks it was helpful .
now i know that i should reverse the mosfet to ground to switch the mosfet .
This video tutorial is very helpful...
Thanks.
Hi... I need a thing to ask about MOSFET issue I am facing can you assist me?
It would be a good Idea to learn to draw circuit diagrams using the correct convention , i.e. positive at the top of the diagram and zero or negative at the bottom with symbols for the components between them .
Thanks! :) useful, I did the setup. But was enhancement VS depletion type mosfets mentioned?, I think that lacks in a lot of mosfet videos, I was playing around with some mosfet i pulled off some junk, and couldn't get it to work the same way, to make mine stay on, i had to put the resistor to positive instead, it wouldn't stay on, it was an enhancement type, this depletion if I am right.
Im still watching now 2023
The protection diode seems to be pointing in the wrong direction.
Very helpful! I will definitely make use of this technique!
Glad you found it useful!
Very good explanation. Thank you :)
If i have Logic level n-mosfet, can i use Vcc=5V to switch 1A LED strip?
Why do you use two transistors to feed 12 volts to gate? why not one?
Very informative video. Thank you.
Nice video l. Was wondering if you could help with a mosfet baded circuit converting 230v 10 amps dc to 230v ac using mosfet?
Something's not right here. All my nfets work with the drain connected to vcc and the source connected to the load.
Why 10kohm as the gate/source resistor? Why not 100k or 1M?
I also want to know this.
I've spent a while looking at that Q2 mistake wondering if I was being dumb for thinking that was wrong. LOL
Thank you Thank you and Thank you. Really you saved my day!
Glad I could help!
Please can someone answer a Q, should a Dual N channel mosfet (4232BGM) have continuity between D1 and S2?? I'm trying to find a short to ground on a samsung rv720 motherboard and so far found the above
Is it not possible to just use one NPN transistor at the start to switch the 12 volts on, which then goes into the gate of the MOSFET, rather than using both NPN and PNP BJTs?
I've tried different configs but found this one to work out quite will. Feel free to experiment with it.
Yeah. I habitually use optocouplers to drain or sink mosfet gates to the load supplies, so there are no worries about relative voltages. They are cheap!
Very nice video. I have a similar use case, however my LED strip is at 24V 2A and i've used a IRL540N logic level mosfet. I do however get a huge voltage drop of 3.4V drain-to-source. Any advice what i could be doing wrong ?
Thank you. How much LED strip are you trying to run? Those logic level FET's tend to have a fairly high resistance. But is shouldn't be that bad.
Its 3 meters long, about 48W (24V at 2A). I'm currently considering a DC-DC converter to up the voltage just before the strip (as the current is already there), however that looks ugly as a solution so i was hoping i'm missing something with the fet and there would be a prettier solution :)
It definitely shouldn't have that much of a drop. You might want to check and see what the voltage is on the gate pin of the MOSFET. It almost seems if it isn't getting turned on fully.
Thank you my friend! you save my degree job!!!! it works very well! cherrs!
Glad you found it useful!
Good video. Has to be since I know more than when I started. 5☆
Very useful! Thank you.
I have an arduino nano with yet to be delivered MOSFET IRFZ44N which is going to power a 1 meter 5050 smd led strip (not much of a load - consumption wise). Would hooking the gate of the mosfet directly to the output pin 13 of the Arduino do the job? Or the 5V of the arduino wouldn't trigger the gate enough for the mosfet to properly switch the led strip on?
cheers, Nino
Glad you found it useful. Yes I think you should be fine hooking the gate pin directly to the microcontroller for a short length of LED strip. Just check to make sure that the MOSFET doesn't get too warm. I don't think it will with such a small load but it won't hurt to check.
a very good explanation, it helped me a lot
thank you!
Thanks, glad you found it useful!
Great tutorial!
Hello sir,
Can you help me for Dimming COB DC lamp with 28V 670mA?
1. TIP41C BJT [100V 6A 65W] it is getting to much hot.
2. IRF540 MOSFET[100V 30A 150W] it is not giving effective dimming
Other Option is to use TIP120C BJT[60V 5A], IRF520 MOSFET[100V 10A]
Which is best IC to use with 4N35 Optoisolator to dim DC with ARDUINO ?
I you want to vary DC voltage without PWM you would almost have to use a BJT of some sort on a large heatsink.
is the emmiter on the NPN transistor not facing the right way in the diagram as it should go from base to grount to let current flow?
Yeah you're right that transistor is facing the wrong way in the diagram. Thanks for pointing that out.
you are welcome, Great video though am a mechanical engineer moving into electrical and am building a seed control for a 24v 2A motor and this REALLY helped and worked like a charm when other circuits didn't. forgot about the gate capacitance bit and got a pair of burnt fingers with PWM though :P Thanks again!
I think I will try the same setup but use an optocoupler to connect them and see what happens. I've accidentally fried a few arduinos so I like to keep the higher voltage away from them.
no need for opto-couplers, a simple NPN or N-Channel transistor will do. A 4.7 K resistor to supply voltage, source or emitter to ground and a current limiting resistor, e.g. 10K to base and then the other end is control. Of course the sense is opposite.
Is it possibil to use a shotky diode on the load side.for making a mosfet modual for 3d printdr
Yes you could.
Good explanation
can you put +12 to source instead -
when you draw the diode are you using electron flow orientation?
No, that's conventional current flow.
I have 12 volt 1.5 ampere power supply, but when I had gate to it according to your schematic diagram then mine both R1 and R2 burnt out. I have irfz44n mosfet
How can i connect with it.
Please guide me.
What values are you using for R1 and R2 the only thing that I can think that would cause that is if the values were too low.
@@Eman2000 thanks for replying,
R1 is 100 ohm and R2 is 10k as per your schematic.
Have you made sure that your mosfet is good? Sometimes they fail and all 3 pins short together. Those resistors should only have about 1ma flowing through them.
@@Eman2000 thanks for responding my query
My mosfet is good, I have tested by making touch switch on and off. It works well. But here in this circuit always resistance are burnt as i connect with battery,
Just started electronics and this might be irrelavent but how can u make ac from a dc source
Kind of depends on what you need the AC for. It usually will start with a clock signal turning on and off at a set rate and then what ever circuity is required for the particular application.
why does my mosfet turn on when its only supplied with source voltage?
Here's a link to a video that covers that topic: th-cam.com/video/5UIuKOgyZs4/w-d-xo.html
Great video. Your video will help me a lot of making project. Can tell me if i use load tt draws a current like 13A as nominal what changes should be done?
Thank you, glad you found it useful. The only thing that would need consideration would be to use a MOSFET that can handle the max current that your load will draw and use appropriately sized wires. Other than that this circuit will work regardless of load.
I wish you had explained why you smoked the arduino. Those of us who use them want to know.
I wish I knew what happened to it too. If I had any idea I would have explained.
Thank you, very helpful.toMe
what does the 2n7000 need to turn on...10v?
10V is the the standard MOSFET gate voltage to turn it on fully. It would be best to check the datasheet.
*_Awesome video! I like it_*
+Shampoo Wow Thank You!
what if you cut the r1 resistor and just put a wire there and it'll quickly go away
If you got rid of the R2 resistor then the MOSFET will never turn on due to the gate pin being tied straight to ground.
but he said cut out r1 not r2
Nice video. Thank you
You're Welcome, Thanks for watching.
Weird way to draw schematics, it's not unintentional that schematics shown in books or in schools been drawn the way drain stands upwards and source downwards. I don't want to argue with you, but understanding the schematic is essential, and with rotated items it's harder.
And to be honest with you, that diode (To Load) on the schematic points the wrong way, this way it won't work ever. Maybe you wanted to show where the load should be, but instead of a diode, you could put a resistor or a light bulb there. It's late, I'm going to sleep.
what about using a LM317 linear regulator to dial in the gate voltage?
You could but that is kind of an expensive option. If you needed to limit the gate voltage using a zener diode would be the easiest option.
by doing this you could have an alternator regulator that is adjustable
couldnt you?
yes you could.
i have recently made a regulator for an alternator. using a zener,
circuit. diodes and resistors and a 2n3904. for the output transistor
i used a tip122. i have a lm317 already set up and heatsinked
will experiment to see if it works with the tip122.
How to use the mosfet with source 220 v d.c
Same thing, just with more caution.
Sir, How much long RGB strip we can drive via Arduino ?
That depends on a lot of factors, the MOSFET, the LED strip being used, the power supply, etc...
If we Use large Current Ex 12V 10A With Common ground to ARDUINO for Controlling then our ciruit will be safe ?
Dharmendra Savaliya Yes it will. I have driven 12V at 30A common ground with Arduino before.
Thank You sir for guide.
Good Video,
How do you determine the values of the gate, and pull-down (gate-source) resistors?
I usually will just use 10K or lower than that if i am using a higher frequency.
good
collector and emittor of Q2 interchanged
Sorry, no prize for being the 3rd person to notice it.
Im trying designes on tesla coils and small transformers and different ac motors
Usually for that sort of thing you would be using MOSFET's or maybe even IGBJT's arraigned in an H-Bridge. If you start looking into Tesla coil drivers you will find some that are set up like this.
Eman2000 👍ill look into it thanks for the reply
i mean r2
what are you trying to say dude?
No wonder my mosfet wont turn off XD
👍TheySayDiodeInParalelWithTheMosfet.IUsedItLikeYouShow:InSeriesWithTheMosfet.ItBurnedTheMosfetWhenIDidntPutDiode.