Interested in learning about wireless power? Subscribers can get up to 80% off Wireless Power to the People - Wireless Charging 101 on udemy using the coupon code "CZcams" www.udemy.com/wireless-power-to-the-people-wireless-charging-101/?couponCode=CZcams
What if my load is a battery? Will PMOSFET also protect me from plugging the charger to the battery the wrong way? Or will the voltage from battery keep PMOSFET open and everything will go in flames?
@@CaptainDangeax Aparently when the load can provide its own voltage, one mosfet is not enuough. You need at least two and two resistors to avoid blowing fuses or something more valuable. www.analog.com/media/en/technical-documentation/application-notes/AN-171_AN-1568.pdf
@@niceshotapps1233 My point is why would you use such a protection on a battery charger ? Of course it's perfectly fit for any electronic appliance with external power supply, but for a battery charger, I don't see the point as I already wrote
2023, 11 years on and this still helps a lot of us. Just dropping this comment to wish you well, and hope that you're living your best live. Warm regards from Manila, PH
Ok, I’m here. Sorry for the 4 year delay but please understand there’s a major backlog for CZcams commenters requesting awards. With that being said... Hear Ye Hear Ye! We gather here today to recognize Afrotechmods for his stellar video tutorials that have gone above and beyond in helping others. His no bullshit approach combined with clear and concise dialogue alone was far more than his competition could come up with yet even that wasn’t enough for Afrotechmods. In a game changing manner, Afrotechmods set the bar higher than Willie Nelson at Snoop Doggs pool party by making a video without a single fucking digression, a feat many CZcams viewers believed to be impossible. We Salute you, Afrotechmods!
or use a diode on the + and - backwards so that it will short circuit ur power supply if connected backwards for dirt cheap and effective reverse polarity protection :)
Yours is a much better video for newbies like me, than the other popular channels which actually just zoom past the descriptions. Your formula and circuit descriptions were very lucid. Thank u..
Props to you for making electronics understandable to the rookie. Years ago, I took an electronics class at the college. First off, I didn't understand jack about what was really going on.... with a few exceptions. But I knew how to calculate stuff, and if I built the schematic right, it worked. Thus I got an A. Boy did I fool them. Later in life I'm exploring electronics again, and I'm pleased that there's lots of good videos that explain this stuff in a less technical fashion... so a rookie can get it.
in a book i am reading, we just got from diodes to transistors and semitransistors and so i am glad to see this video from you. you can be a very great teacher for me to learn from
Very intuitive explanation. You make excellent videos!! Please make more! One of the channels on CZcams that does make sense and is very educational down to the point you want. Lots of good examples and case scenarios.
In the past, mosfets and co. was black magic for me. When I saw your tutorial videos, I understood it + the datasheets of mosfets make sense now. I really appreciate your time spending such good clips and hope to see more of them.
@Afrotechmods that is exactly what I saw in the sim, and would expect. Thanks for the videos. Your time and effort making these videos are greatly appreciated. Thank you.
Thank you. You explained this really well! I like how you don't gloss over any of the important details and how you work up from a simple solution to a more complex one and explain all the hows and whys. Really excellent video!!
Good stuff. I've seen a few of your videos like this one. You don't overload them with information the average hobbyist doesn't need, but you don't leave it so vague that a part timer might still get it wrong.
@mediaguardian Above -2V, (i.e. -1V, 0V, +2V etc.) the mosfet is in cutoff mode ("off"). Between -2V and -4V (specified min and max) the behaviour could easily vary from batch to batch and you could end up in the linear region where the Rds is several ohms to several kilohms. Then -4V or less (-5V, -6V etc) you enter saturation mode ("on") with lower resistance as you approach -25V. So in a switching application the designer knows to stay well beyond the -2...-4V range
Thanks for the video. But when choosing the right MOSFET for some application, I think that the choice must also take in consideration the maximum current allowed through the transistor.
I love coming to your channel and videos to "wrap up" my understanding of various topics. I'm newbie and just getting back into using p-channel mosfets. I had an ok understanding of how to read the p-channel data sheet to choose the correct transistor for my app however after listening to this it makes complete sense - I wish all my teachers were like you "back in the day" (or at least I wish they had youtube when I was in college lol) - thank you!
Am I glad I stumbled on this tutorial! What a great trick. I never thought about that one. Furthermore, one could do the same with an N type MOSFET by just connecting the drain on the minus side of the power source.
sony10 , yes , I agree that at first glance, the circuit appear quite weird. But when you look closely pay attention to the polarity of a P channel Gate compare to Source. Keep in mind that a MOSFET is a variable resistor ( at least when utilized at low voltage ) . This means that , when ON, (short) , you can feed current both polarities, it still will act as a short circuit. This is why it appear weird when you look at a circuit that show a P channel connected as if it was a N channel. In this circuit the PMOS is utilized in reverse polarity. It need to be this way because of the internal inevitable substrate intrinsic diode that would be turned ON if you were to use an N channel and made a mistake of reversing polarity. You don't want any current circulating if in reverse battery connection. Hence, wether using a P or NMOS you want the internal diode in the direction of the current flow. Most circuits utilize a MOSFET configuration with current being blocked by the internal diode. In this circuit you want it configured such that when the battery polarity is correct the current would flow through the internal diode (if the gate was not energized) because in case of reverse battery polarity ( an undesirable error ) you certainly do not want any current flowing. So, you Then have to connect the PMOS in reverse, which is totally allowed according a MOSFET specification sheet. Once the battery is connected properly the internal diode will bring the Source to a higher potential then the Gate ( even if the Drain is of higher potential, it's not prohibited) you now have a Gate that could be connected to a voltage potential lower than the Source ( a condition to turn ON the PMOS) . Once the Gate is put to a lower potential it turns ON the PMOS and the voltage lost in the internal diode becomes almost zero because you now have a PMOS turned ON ( a short circuit ). Hope that make any sense to you. At least, that is how I see it.
sony10 , the short version. A MOSFET can be utilized both polarities. As long as the Gate is at lower voltage then the Source you have a ON (short) MOSFET , which is what you want here in this circuit. D higher voltage than S is totally allowed if you do not exceed the forward internal diode maximum current mentioned in the specification sheet of your device.
Very nice introduction to reverse battery protection technics. You also could have mentioned the use of NMOS (and its associated charge-pump circuit) if you are in the case of very high drain current (NMOS tends to have better Rdson characteristics than PMOS). But this method requires more complex circuitry of course ...
Excellent explanation! There could be just one minor improvement - the contradiction proves the transistor cannot *stay* ON but it does *not* prove it wouldn't start to conduct from the initial state when it is still OFF. In other words, without proving the process of conducting could never *start* we cannot be sure if there aren't oscillations. Because, *if* in the initial moment the transistor was starting to conduct, we proved only it will turn OFF once after it *already* was turned ON. If the tranistor would then (when it is OFF) be able to start conducting (again) the process would repeat again and again. I am aware these conditional sentences are not grammatically 100% correct but I hope it could be understood what I wanted to say.
If the battery is connected in reverse as in 3:21 then the Drain of PFET is below ground, then the Source pin doesn't have much chance of ever going above ground so PFET should never turn on.
Honestly, the only thing I really understood was at the very very end when u said "You are now hereby granted with powers of reverse voltage protection!" 😬👍
1. schematic called "ideal diode". 2. n-mosfet better then p-mosfet (cuz Ron is smaller). it have simmetrical schematic but inserted to ground wire . 3. nice video :) best regards
Use a charge pump on the gate. Really simple to implement because its not drawing any current. You can buy a small IC that provides the voltage you need. To protect the charge pump IC you can just implement pMOS or a simple diode on its VCC terminal. Since it draws current in the uA range, the losses are negligible. The losses in implementing the charge pump to have a high side nMOS is usually much lower than using a pMOS
@@ericcartmann true but look at the datasheet again, it's spec'd at 0.026 ohms @ ~24 amps/10 volts, ( heat sunk to 25 deg C of course ) in any case at 2.0 amps it's much much less. personally i prefer Geranium diodes over Si... lower Voltage drop . . . & i have a ton of those laying around in metal cases.
@@robozstarrr8930 The problem with those metal cases is they are made of zinc, and zinc whiskers. Most of them have already shorted themselves out and they are no longer manufactured.
Be _very_ careful about that on a complex system (with multiple boards, for example) because you may short the "Protected" Ground with the real ground over multiple boards and fry them all T.T
If you think of protective fet as of part of the battery, it doesn't make any difference, is it pfet at positive battery terminal, or a nfet at negative one. In other words, just assume your ground and positive rail after fet, and never think of reaching battery's terminals, and you are good. So I would think of using nfet at bottom always, they often go under 10 mOhm of rds on. Also, nfet is very convenient when you want to control its gate with a MCU for soft on-off feature.
I know this works, but one thing is bugging me: if you are using a PMOS, the normal current flow should be from source to drain, and not the other way around. This should be OK if you had the symmetrical component (like JFET), but this is not the case. Can you explain this a bit?
Milan Lukic In fact, for PMOS, if Vds>0.7 or so, it just turn on and act as a diode (no matter what the voltage is on the Gate). you can get this info. from it's symbol...
Milan Lukic MOSFETs generally work on the fact that a channel is created between drain and source when the gate charge attracts charges into the channel, reversing its behavior. When a channel is created, it doesn't matter which way the electrons flow in it.
Milan, you’re right. The Drain-Source should be swaped. MOSFET has a internal diode that points from source to drain in N channel devices and drain to source in P channel devices. Therefore in a PMOS current flows from Source to drain not the other way around.
Thank you very much, someone FINALLY!!! did a video on this. I've been looking for this particular answer for a week or two by now. First one was the SINE WAVE-MADE PURE was my first & of coarse the second one fell right into order with what I needed. I subscribed so hopefully I'll get any new ones on these subjects. Thanks again, Tom.
I have the best and simpliest solution to this( without any wasted energy) Get yourself a some round connector, that you cant plug in reversed ! It's drunk proof, dumb proof...... :D
That's funny. That is until I started to really thinking about it, it's not such a bad idea after all. If we made the whole world with drunk proof electricity then no more Boo Boo's with all of that going on No More, No More, as the Raven said, LOL.
Think of a little guy inside with a voltmeter and a rheostat. The voltmeter measures the voltage between the gate and source. As that voltage increases, he turns the resistance down on the rheostat. It's the same as the model for a BJT, except that the little guy there has an ammeter instead of a voltmeter.
love ur sense of humor. great vid too! I love to blow things up. ran 5v through a 3v led, lens cap got hot, exploded sending the cap through the ceiling tile AUSOME!!!!!!
Please, please make more vids! I have learnt more from you than any other. You have ultimate teachers talent. Use it to fulfill child's dream of better world.
@CoolDudeClem I implied several times in the video that if Vgs is 0V the FET would be off. It needs -4V or less to turn on. The circuit at the end of the video with the zener diode will clamp a large gate voltage down to the zener voltage.
I can't for the life of me figure out how I only now discovered your channel... CZcams recommendations are lacking! I've been watching EEVBlog and W2AEW for years, but only found your channel recently.
Thank you for this video. I have watched numerous videos all talking about reverse polarity and showing you a generic circuit. But very few bother to comment on how to choose your parts. Again, thank you.
Handy to know tip! In certain cases where you're not bothered about power efficiency, just use a bridge rectifier then you can connect your power leads which ever way you like and it'll always work!
This has made everything so clear, I have been trying to figure out p-channel mosfets for months now in a circuit simulator circuit simulator and getting really confused as to why things were not working the way I thought they would, and that's all because it doesn't show the ''parasitic diode'' in the mosfet.
This one is really good for me as I have just finished making my 0v to 27 v regulated discreet power supply with variable current . The lecture is very clear and precise.Very good video
@Afrotechmods Thank you very much! Yes, that was my mistake! And as a result I though that ground "had to" be something specific. I owe you one :P Everything crystal clear now! Keep up the great work with your videos!
Awesome explanation, we do this at work but many an engineer just take it as tribal knowledge, it is refreshing to have the principal explained as the teacher would explain it to the pupil.
THANK YOU. CLEAR. EXACTLY WHAT WE WERE TALKING ABOUT AT BREAKFAST; AND YOU'VE ALREADY DONE IT !!! I WAS USING THIS IN SOLAR PANEL DESIGN ELIMINATING DIODE LOSS. LOOKING AT N CHANNEL FOR LOWER RDSS. NICE TUTORIAL, THANKS AGAIN.
@colt4547 You absolutely can. But the downside is that you introduce a few milliohms of resistance on your ground rail, which may or may not be a problem depending on what you are doing.
Interested in learning about wireless power? Subscribers can get up to 80% off Wireless Power to the People - Wireless Charging 101 on udemy using the coupon code "CZcams"
www.udemy.com/wireless-power-to-the-people-wireless-charging-101/?couponCode=CZcams
thank you for this very usefull video. I know what to do with all those useless mosfets I got on dead PC motherboards
What if my load is a battery? Will PMOSFET also protect me from plugging the charger to the battery the wrong way? Or will the voltage from battery keep PMOSFET open and everything will go in flames?
@@niceshotapps1233 The charger already provides a diode bridge rectifier and a fuse. Plug it the wrong way a the fuse will simply blow
@@CaptainDangeax Aparently when the load can provide its own voltage, one mosfet is not enuough. You need at least two and two resistors to avoid blowing fuses or something more valuable. www.analog.com/media/en/technical-documentation/application-notes/AN-171_AN-1568.pdf
@@niceshotapps1233 My point is why would you use such a protection on a battery charger ? Of course it's perfectly fit for any electronic appliance with external power supply, but for a battery charger, I don't see the point as I already wrote
2023, 11 years on and this still helps a lot of us. Just dropping this comment to wish you well, and hope that you're living your best live. Warm regards from Manila, PH
This series is excellent. Easily the best electronics tutorials on CZcams that I've run across. Someone please give this man an award.
Ok, I’m here. Sorry for the 4 year delay but please understand there’s a major backlog for CZcams commenters requesting awards. With that being said...
Hear Ye Hear Ye! We gather here today to recognize Afrotechmods for his stellar video tutorials that have gone above and beyond in helping others. His no bullshit approach combined with clear and concise dialogue alone was far more than his competition could come up with yet even that wasn’t enough for Afrotechmods. In a game changing manner, Afrotechmods set the bar higher than Willie Nelson at Snoop Doggs pool party by making a video without a single fucking digression, a feat many CZcams viewers believed to be impossible. We Salute you, Afrotechmods!
True
Why dont YOU give him an award?? Allways the others should do it...
Here's the award : 🏅🏆
Just wanted to say you make the best tutorials !!!!!!
+George Kot Thanks!
Agreed!
or use a diode on the + and - backwards so that it will short circuit ur power supply if connected backwards for dirt cheap and effective reverse polarity protection :)
If your 'power supply' is a non protected lithium polymer battery, that's not going to be pretty
With a proper rated fuse or polyfuse this could work
Yours is a much better video for newbies like me, than the other popular channels which actually just zoom past the descriptions. Your formula and circuit descriptions were very lucid. Thank u..
Props to you for making electronics understandable to the rookie. Years ago, I took an electronics class at the college. First off, I didn't understand jack about what was really going on.... with a few exceptions. But I knew how to calculate stuff, and if I built the schematic right, it worked. Thus I got an A. Boy did I fool them. Later in life I'm exploring electronics again, and I'm pleased that there's lots of good videos that explain this stuff in a less technical fashion... so a rookie can get it.
Wow. It is something awesome and cool. Great work uploaded.
Thanks for taking the extra time and effort to make your videos concise and succinct.
in a book i am reading, we just got from diodes to transistors and semitransistors and so i am glad to see this video from you. you can be a very great teacher for me to learn from
Just as your other videos, a clear and concise explanation of an electronics concept. Thank you.
Very intuitive explanation. You make excellent videos!! Please make more! One of the channels on CZcams that does make sense and is very educational down to the point you want. Lots of good examples and case scenarios.
In the past, mosfets and co. was black magic for me. When I saw your tutorial videos, I understood it + the datasheets of mosfets make sense now.
I really appreciate your time spending such good clips and hope to see more of them.
@Afrotechmods that is exactly what I saw in the sim, and would expect. Thanks for the videos. Your time and effort making these videos are greatly appreciated. Thank you.
Thanks man, I always learn something watching your vids
amazing tutorial. thank you very much for the fine explanation. thoroughly clear
Thank you. You explained this really well! I like how you don't gloss over any of the important details and how you work up from a simple solution to a more complex one and explain all the hows and whys. Really excellent video!!
Good stuff. I've seen a few of your videos like this one. You don't overload them with information the average hobbyist doesn't need, but you don't leave it so vague that a part timer might still get it wrong.
I've been doing electronics for 50 odd years and how that simple trick evaded me I'll never know. Well presented.
lol
Please continue to make videos!
ONE of the BEST videos .Crisp and Clean.. Well done
This channel is a Carrier and by extension life saver,tons of credit to you Boss.
@mediaguardian Above -2V, (i.e. -1V, 0V, +2V etc.) the mosfet is in cutoff mode ("off"). Between -2V and -4V (specified min and max) the behaviour could easily vary from batch to batch and you could end up in the linear region where the Rds is several ohms to several kilohms. Then -4V or less (-5V, -6V etc) you enter saturation mode ("on") with lower resistance as you approach -25V. So in a switching application the designer knows to stay well beyond the -2...-4V range
Thanks for the video. But when choosing the right MOSFET for some application, I think that the choice must also take in consideration the maximum current allowed through the transistor.
I love coming to your channel and videos to "wrap up" my understanding of various topics. I'm newbie and just getting back into using p-channel mosfets. I had an ok understanding of how to read the p-channel data sheet to choose the correct transistor for my app however after listening to this it makes complete sense - I wish all my teachers were like you "back in the day" (or at least I wish they had youtube when I was in college lol) - thank you!
Awesome tutorial, very clear and definitely not a waste of time, like many others out there! Thanks a million!
Am I glad I stumbled on this tutorial! What a great trick. I never thought about that one. Furthermore, one could do the same with an N type MOSFET by just connecting the drain on the minus side of the power source.
Hey man. The circuit in this video. Why does D and S revesed?
Usually, PMosfet, S to + and D to load!!! This is crazy
Plz help 😣
sony10 , yes , I agree that at first glance, the circuit appear quite weird. But when you look closely pay attention to the polarity of a P channel Gate compare to Source. Keep in mind that a MOSFET is a variable resistor ( at least when utilized at low voltage ) . This means that , when ON, (short) , you can feed current both polarities, it still will act as a short circuit. This is why it appear weird when you look at a circuit that show a P channel connected as if it was a N channel. In this circuit the PMOS is utilized in reverse polarity. It need to be this way because of the internal inevitable substrate intrinsic diode that would be turned ON if you were to use an N channel and made a mistake of reversing polarity. You don't want any current circulating if in reverse battery connection. Hence, wether using a P or NMOS you want the internal diode in the direction of the current flow. Most circuits utilize a MOSFET configuration with current being blocked by the internal diode. In this circuit you want it configured such that when the battery polarity is correct the current would flow through the internal diode (if the gate was not energized) because in case of reverse battery polarity ( an undesirable error ) you certainly do not want any current flowing. So, you Then have to connect the PMOS in reverse, which is totally allowed according a MOSFET specification sheet. Once the battery is connected properly the internal diode will bring the Source to a higher potential then the Gate ( even if the Drain is of higher potential, it's not prohibited) you now have a Gate that could be connected to a voltage potential lower than the Source ( a condition to turn ON the PMOS) . Once the Gate is put to a lower potential it turns ON the PMOS and the voltage lost in the internal diode becomes almost zero because you now have a PMOS turned ON ( a short circuit ). Hope that make any sense to you. At least, that is how I see it.
sony10 , the short version. A MOSFET can be utilized both polarities. As long as the Gate is at lower voltage then the Source you have a ON (short) MOSFET , which is what you want here in this circuit. D higher voltage than S is totally allowed if you do not exceed the forward internal diode maximum current mentioned in the specification sheet of your device.
@@jimviau327 tks alot
And tks again!!!
Im thinking.... This one is crazy
@@jimviau327 now I can die in peace ✌️
Very nice introduction to reverse battery protection technics. You also could have mentioned the use of NMOS (and its associated charge-pump circuit) if you are in the case of very high drain current (NMOS tends to have better Rdson characteristics than PMOS). But this method requires more complex circuitry of course ...
If your battery is isolated from 0V a N MOSFET on the negative works just as well😊
You do such a great job with the presentation: comprehensive and thorough.
Great video! I like how you were descriptive as possible, while creating an interesting video.
Excellent explanation! There could be just one minor improvement - the contradiction proves the transistor cannot *stay* ON but it does *not* prove it wouldn't start to conduct from the initial state when it is still OFF. In other words, without proving the process of conducting could never *start* we cannot be sure if there aren't oscillations. Because, *if* in the initial moment the transistor was starting to conduct, we proved only it will turn OFF once after it *already* was turned ON. If the tranistor would then (when it is OFF) be able to start conducting (again) the process would repeat again and again. I am aware these conditional sentences are not grammatically 100% correct but I hope it could be understood what I wanted to say.
If the battery is connected in reverse as in 3:21 then the Drain of PFET is below ground, then the Source pin doesn't have much chance of ever going above ground so PFET should never turn on.
Honestly, the only thing I really understood was at the very very end when u said "You are now hereby granted with powers of reverse voltage protection!" 😬👍
You're born to be a teacher! The explanation is easy to follow
Thanks for covering the P-MOSFET VGS part as well. I corrected my design at the last moment. Thanks again.
1. schematic called "ideal diode".
2. n-mosfet better then p-mosfet (cuz Ron is smaller). it have simmetrical schematic but inserted to ground wire .
3. nice video :) best regards
+nRADRUS 2. True, but we want a common ground, if somehow possible.
lg, couka
Use a charge pump on the gate. Really simple to implement because its not drawing any current. You can buy a small IC that provides the voltage you need.
To protect the charge pump IC you can just implement pMOS or a simple diode on its VCC terminal. Since it draws current in the uA range, the losses are negligible.
The losses in implementing the charge pump to have a high side nMOS is usually much lower than using a pMOS
@@ericcartmann true but look at the datasheet again, it's spec'd at 0.026 ohms @ ~24 amps/10 volts, ( heat sunk to 25 deg C of course ) in any case at 2.0 amps it's much much less. personally i prefer Geranium diodes over Si... lower Voltage drop . . . & i have a ton of those laying around in metal cases.
@@robozstarrr8930 The problem with those metal cases is they are made of zinc, and zinc whiskers. Most of them have already shorted themselves out and they are no longer manufactured.
Be _very_ careful about that on a complex system (with multiple boards, for example) because you may short the "Protected" Ground with the real ground over multiple boards and fry them all T.T
I'm just starting to study electronics and these are some of the most fun vids on YT.
The world needs tons of people like you Sir....!
very well detailed explained...!
Thanks..!
Great video. It's much easier/cheaper to find low Rds on n-channel mosfet than p-channel. Once you get to
If you think of protective fet as of part of the battery, it doesn't make any difference, is it pfet at positive battery terminal, or a nfet at negative one. In other words, just assume your ground and positive rail after fet, and never think of reaching battery's terminals, and you are good.
So I would think of using nfet at bottom always, they often go under 10 mOhm of rds on. Also, nfet is very convenient when you want to control its gate with a MCU for soft on-off feature.
Thanks for the great video, now I can make a more efficient killing machine. :-)
I am impressed by the clarity in your English and pronunciation.
One of the best videos that I have seen about electronics in a while
Thanks
I know this works, but one thing is bugging me: if you are using a PMOS, the normal current flow should be from source to drain, and not the other way around. This should be OK if you had the symmetrical component (like JFET), but this is not the case. Can you explain this a bit?
Milan Lukic In fact, for PMOS, if Vds>0.7 or so, it just turn on and act as a diode (no matter what the voltage is on the Gate).
you can get this info. from it's symbol...
Milan Lukic MOSFETs generally work on the fact that a channel is created between drain and source when the gate charge attracts charges into the channel, reversing its behavior. When a channel is created, it doesn't matter which way the electrons flow in it.
Milan, you’re right. The Drain-Source should be swaped. MOSFET has a internal diode that points from source to drain in N channel devices and drain to source in P channel devices. Therefore in a PMOS current flows from Source to drain not the other way around.
ElectroBOOM Medhi! You are one of my heroes
@@SakarPudasaini10 you are a godsend
"...and you can be as drunk and irresponsible as you want." 😂
man your videos are allways awesome to watch!
i really look forward to watch more from you!
Thanks for this. I've been trying to figure this out and this video put all I have learn in place. Thanks for all the hard work.
"lol, typo" ha nice ^^
Still there
Great I am a master at this...now I just have to learn electricity in physics...lolz
Afrotechmods, you are truly a master!
Thank you very much, someone FINALLY!!! did a video on this. I've been looking for this particular answer for a week or two by now. First one was the SINE WAVE-MADE PURE was my first & of coarse the second one fell right into order with what I needed. I subscribed so hopefully I'll get any new ones on these subjects. Thanks again, Tom.
I have the best and simpliest solution to this( without any wasted energy) Get yourself a some round connector, that you cant plug in reversed ! It's drunk proof, dumb proof...... :D
That's funny. That is until I started to really thinking about it, it's not such a bad idea after all. If we made the whole world with drunk proof electricity then no more Boo Boo's with all of that going on No More, No More, as the Raven said, LOL.
Poka yoke, always best indeed. Thought a protection can't do any harm...
Until the drunk installs the batteries backwards.
Mosfets are soo strange
Think of a little guy inside with a voltmeter and a rheostat. The voltmeter measures the voltage between the gate and source. As that voltage increases, he turns the resistance down on the rheostat. It's the same as the model for a BJT, except that the little guy there has an ammeter instead of a voltmeter.
love ur sense of humor. great vid too! I love to blow things up. ran 5v through a 3v led, lens cap got hot, exploded sending the cap through the ceiling tile AUSOME!!!!!!
The greatest tutorial I have ever seen!
You are simply an AWSOME teacher. Fantastic work! Thank You.
Love it. Great video. Saves my circuits for 4 years, or so :)
Thanks man! you're videos are always solid!
Afrotechmods come back, I miss how informative and easy to follow your videos are for learning. :(
Keep on Afrotchmods you'r doing great.
I love your sense of humor. Almost choked on my coffee watching this video, another great educational video.
Thanks very much, I've been looking for this information for a while.
It was very well explained, even for a beginner like me to understand.
Finally the physical explanation I was looking for. Many Thanks🙏
Great video, no god-awful background music (which is always too loud), or sound effects. Thanks Afrotech, you do good work.
Yeah Bob you're right for once somebody mentioned something about the crappy generic music that people put on these electronic videos..thanks :)
Brilliant videos.. practical, concise and clear... and love the bits of humour as well..
dazzling presentation. you're the electronics prof i never had. long line afrotechmods
Please, please make more vids! I have learnt more from you than any other. You have ultimate teachers talent. Use it to fulfill child's dream of better world.
Very clever design and an excellent lecture on how it all works!
@CoolDudeClem I implied several times in the video that if Vgs is 0V the FET would be off. It needs -4V or less to turn on. The circuit at the end of the video with the zener diode will clamp a large gate voltage down to the zener voltage.
I can't for the life of me figure out how I only now discovered your channel... CZcams recommendations are lacking! I've been watching EEVBlog and W2AEW for years, but only found your channel recently.
Excellent in all aspects. You have more than earned my admiration, and subscription.
I’ll be sure to include this neat trick into my next elerical projects, thanks !
Thank you for this video. I have watched numerous videos all talking about reverse polarity and showing you a generic circuit. But very few bother to comment on how to choose your parts.
Again, thank you.
Excellent video & description of MOSFET usage especially the Rds value
this was great, gave me a clear understanding of the P-FET
Handy to know tip! In certain cases where you're not bothered about power efficiency, just use a bridge rectifier then you can connect your power leads which ever way you like and it'll always work!
Amazing explanation, thanks for these tutorials!
that was so clearly and concisely explained, thank you so much!
Excellent solution, I was wondering about the wasted power of just using a diode. Thanks for a great answer at the right time
This has made everything so clear, I have been trying to figure out p-channel mosfets for months now in a circuit simulator circuit simulator and getting really confused as to why things were not working the way I thought they would, and that's all because it doesn't show the ''parasitic diode'' in the mosfet.
Dude, you re great. Am new to your channel but never too late to be a subscriber. Great contents out there. Thumbs up to
This one is really good for me as I have just finished making my 0v to 27 v regulated discreet power supply with variable current . The lecture is very clear and precise.Very good video
Maxx Smaxx the zip
what a gift to sell knowledge to others ! - world needs such teachers
Excellent video! Thank you! Look forward to more!
Excellent, easy to understand, very well designed presentation!
This is a wonderful tutorial! Bravo!
What a great teaching source! Thankyou👍
You are a really good instructor!
@Afrotechmods Thank you very much! Yes, that was my mistake! And as a result I though that ground "had to" be something specific.
I owe you one :P
Everything crystal clear now!
Keep up the great work with your videos!
Why does people thumbs down on this video? This is very informative and useful information.
I use this trick for all my portable projects. Excellent protection from the effects of alcohol.
Good demonstration. Nice clear voice that is easy to understand. Looking forward to more of your videos. You have a new subscriber.
Very interesting videos and very enjoyable. I learn more here and it’s better understood than the electronic 101 I took a few years ago.
very good video. Everything explained was to the point. You must be the expert in Electronics. Thanks
Thank you for the tutorial, it was very useful for me
Awesome explanation, we do this at work but many an engineer just take it as tribal knowledge, it is refreshing to have the principal explained as the teacher would explain it to the pupil.
Great vid, simple and informational as always :)
THANK YOU. CLEAR. EXACTLY WHAT WE WERE TALKING ABOUT AT BREAKFAST; AND YOU'VE ALREADY DONE IT !!!
I WAS USING THIS IN SOLAR PANEL DESIGN ELIMINATING DIODE LOSS.
LOOKING AT N CHANNEL FOR LOWER RDSS. NICE TUTORIAL, THANKS AGAIN.
Great video, came up on my page 9 years later!
@colt4547 You absolutely can. But the downside is that you introduce a few milliohms of resistance on your ground rail, which may or may not be a problem depending on what you are doing.
very concise, very to the point, very practical. love it. thanks
Damn, that was the clearest I have ever seen! You are awesome. Sub'd for sure. +1
This is an excellent video, I might incorporate a reverse polarity protection circuit into my next project