I am a retired auto tech and building a daily driver with reliable robust parts and creating as service manual to go with it. My biggest hurdle in planning for the correct n-type Mosfet, is correct on voltage within saturation. I am running a cooling fan across a radiator type device to cool the automatic transmissions fluid. Using a can/probe type NTC thermistor at 10k (Standard for 25 degrees C) but also to make it adjustable, I am placing a 10k pot as a voltage divider for gate control of an N-channel Mosfet. I believe with most data sheets that 2-4 volts for “On” voltage for the Mosfet, I will use a 100 ohms resistor. I will use an external relay oversized to ensure a robust circuit and ease of diagnostics, repair, testing and a large auto-type relay box, found behind the glove box of Park Avenues & LeSabers. It is narrow and takes little space, yet holds 12 relays and 14 fuses. I am very good with auto electronics, but ok will enough knowledge to build a circuit on a bread board...without setting a fire! They sell digital readout type temp sensors for $10. But they loose their setting if disconnected from power. I don’t want that! I will spend $20 now, to save $150 later. Your thoughts on a mosfet? My eyes are bleeding after 77 data sheets and 94 videos that mostly play music. Great for music lovers, but I want to get one thing done per day, while waiting for my S1-L2 lumbar fusion. It’s not fun or easy, but not related to fixing cars since the late 60’s. Thank you for a clear explaintion and I have to admit, I was saying out loud to draw the vertical dotted line...and you did! God bless you.
This is VERY HELPFUL. Thank you especially for: not only verbalizing the effects on Current, Resistance, and Voltage; but writing also. That really makes a world of difference--it reinforces those points! Seriously, you should teach. You have an intuition for clarity.
Very well explained thank you. A question, @5:46 how could the Vds be low when Id is close to 0? Shouldn't it be the other way around? I mean the Vds shouldn't be high when Id is close to 0?
I have alot of mosfet from different circuit boards.ok so i have a QW MS305D dc power supply right the mosfet has shortened out.so I'm going to replaced it with the new mosfet transistor on the volts side.theres 2 so i don't know which one has shortened out but i will think critically and choose which one.
You did not explain how this works? I mean what is making the mofset have a Voltage Threshold and Then Saturation mode. How does this work like this internally, can someone please explain? Thank you.
Id is zero because VGS has not surpassed the Vth (threshold voltage) assigned to the MOSFET by the manufacturer. So no current flows until that voltage is met.
I'm new to MOSFETs, let me begin with that, but I'm not seeing something here. I'm stuck at 5:50. If Id is close to zero, it follows that Rds is very high. Fine. However, this would imply that Vds is also high. If current is not flowing, then there's in implied high resistance. How then would Vds be low?
When the transistor is open, the voltage Vds should be high isn't it? And when it is closed, Vds should be low. If yes, then the portion of a video at 6:28 is incorrect.
Yeah when Vgs is high then Vds will be low (Practically no voltage drop across the device). Basically all the current will flow from Drain to Source with the exception of the small voltage drop due to the Resistance of the Mosfet when on (Rds on parameter on datasheet). I was going to comment on that too until I saw your comment.
@Soumeya Benzina If there's say a 12V voltage source between drain and source and Vgs is *lower* than Vth (which is the voltage between gate and source at which the mosfet starts to conduct current) then Vds will be 12V.
The problem with education is that everyone wants to be politically correct. Just say if the damn gate voltage is high then the supply voltage is high too
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When you get to this level of explaining things, it means you have grasped the concept. Thank you very much Sir..
Wow, this synthesized 3 hours of lecture in the best way possible
You have mastered the art of translating electronics concepts. Thank you! Excellent video.
Very well explained. One of the best videos out there explaining MOSFETs. Great job!
I am a retired auto tech and building a daily driver with reliable robust parts and creating as service manual to go with it. My biggest hurdle in planning for the correct n-type Mosfet, is correct on voltage within saturation.
I am running a cooling fan across a radiator type device to cool the automatic transmissions fluid. Using a can/probe type NTC thermistor at 10k (Standard for 25 degrees C) but also to make it adjustable, I am placing a 10k pot as a voltage divider for gate control of an N-channel Mosfet. I believe with most data sheets that 2-4 volts for “On” voltage for the Mosfet, I will use a 100 ohms resistor. I will use an external relay oversized to ensure a robust circuit and ease of diagnostics, repair, testing and a large auto-type relay box, found behind the glove box of Park Avenues & LeSabers. It is narrow and takes little space, yet holds 12 relays and 14 fuses. I am very good with auto electronics, but ok will enough knowledge to build a circuit on a bread board...without setting a fire!
They sell digital readout type temp sensors for $10. But they loose their setting if disconnected from power. I don’t want that! I will spend $20 now, to save $150 later. Your thoughts on a mosfet? My eyes are bleeding after 77 data sheets and 94 videos that mostly play music. Great for music lovers, but I want to get one thing done per day, while waiting for my S1-L2 lumbar fusion. It’s not fun or easy, but not related to fixing cars since the late 60’s. Thank you for a clear explaintion and I have to admit, I was saying out loud to draw the vertical dotted line...and you did! God bless you.
This guy is a magician. Hours of lecture that went in one ear and out the other explained so simply in 12 minutes
This is VERY HELPFUL.
Thank you especially for: not only verbalizing the effects on Current, Resistance, and Voltage; but writing also. That really makes a world of difference--it reinforces those points!
Seriously, you should teach. You have an intuition for clarity.
finely someone has taught me well.After 8 other videos and a whole lot of wasted time.I thank you sir.
At 5:32,you said.. When Vgs is high, Vds is high. I am a bit confused. When the mosfet conducts, the voltage across should drop. Please clarify
Yeah I have the same doubt, Vds should drop and current rise through it, right?
This video was explained perfectly! Thank you very much !
Great stuff, thanks so much. The graphs were amazing, really helped.
You are one the best trainer and teacher I realy llearned from you, keep helpin usplease.
Keep making videos brother
You solved my doubts in few minutes
Thanks man❤️
Thank you. Well explained. Good video learned a lot.
Thank you. This was well-explained.
Great videos, really helps with my exam prep!
Very cool and simple way to explain the MOFSET ! already watch many video about MOFSET but too complex for me to understand
This is awesome! Thank you so much!
You are a very good teacher. thanks for the video.
Excellent video, very concise and time efficient
Sir, Very well explained.
Very good video, thanks for posting it.
thank you a very simple video
Fabulous explanation. Thank you
Great video, thank bro
Mahn, you're a god sent. :')
Excellent!! 👍👍
Well explained👍
great video, thank you
Thanks so much.
Great vid
Very well explained thank you. A question, @5:46 how could the Vds be low when Id is close to 0? Shouldn't it be the other way around? I mean the Vds shouldn't be high when Id is close to 0?
I have alot of mosfet from different circuit boards.ok so i have a QW MS305D dc power supply right the mosfet has shortened out.so I'm going to replaced it with the new mosfet transistor on the volts side.theres 2 so i don't know which one has shortened out but i will think critically and choose which one.
Good job
wow i learned more in this than in class
great
Respect++❤
Well said
Can i hang the gate ang put 24v supply for power supply?
Thankyou.you should become my electrican teacher 😊
Thank you so much for this. Perfect explanation so even the dumbest can get it. I know for certain because I got it :).
You did not explain how this works? I mean what is making the mofset have a Voltage Threshold and Then Saturation mode. How does this work like this internally, can someone please explain? Thank you.
Does saturation region mean full up with electrons? Saturated with electrons?
Resistance is at its lowest. Yes.
Hi... I need a thing to ask about MOSFET issue I am facing can you assist me?
How do we calculate Vds?
need more explanation as to why id is 0 when VGS is increasing in the beginning
Id is zero because VGS has not surpassed the Vth (threshold voltage) assigned to the MOSFET by the manufacturer. So no current flows until that voltage is met.
Proficient- thanks
I'm new to MOSFETs, let me begin with that, but I'm not seeing something here. I'm stuck at 5:50.
If Id is close to zero, it follows that Rds is very high. Fine. However, this would imply that Vds is also high. If current is not flowing, then there's in implied high resistance. How then would Vds be low?
I think he made an error. Vds is independent from Vgs.
Why do you write iD as a variable? Do you mean current between D and S? iDS
Gentlemen, we might actually have a fighting chance in the exam.
When the transistor is open, the voltage Vds should be high isn't it? And when it is closed, Vds should be low. If yes, then the portion of a video at 6:28 is incorrect.
Yeah when Vgs is high then Vds will be low (Practically no voltage drop across the device). Basically all the current will flow from Drain to Source with the exception of the small voltage drop due to the Resistance of the Mosfet when on (Rds on parameter on datasheet). I was going to comment on that too until I saw your comment.
Yup, you're correct.
@Soumeya Benzina If there's say a 12V voltage source between drain and source and Vgs is *lower* than Vth (which is the voltage between gate and source at which the mosfet starts to conduct current) then Vds will be 12V.
@Soumeya Benzina That's correct assuming that its not a P-mos device.
Vds is high if vgs is low.
I thought so, if Vgs is low, Voltage across drain and source is high. Is this right? 🙄
I am new to this devise, but I think the Vds's are backwards
Yes, I saw that too.
The problem with education is that everyone wants to be politically correct. Just say if the damn gate voltage is high then the supply voltage is high too