How to protect circuits from reversed voltage polarity!

How to use diodes, schottky diodes and P-FETs to protect your circuits from reversed voltage/power connections.

[Afrotechmods]

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[jomac_ph]

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

[universalsailor]

This series is excellent. Easily the best electronics tutorials on Youtube that I've run across. Someone please give this man an award.

[DeadKoby]

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.

[georgekot]

Just wanted to say you make the best tutorials

[appdev]

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..

[PeterScargill]

I've been doing electronics for 50 odd years and how that simple trick evaded me I'll never know. Well presented.

[arthurchassande]

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 ...

[lazzatehayat]

I am impressed by the clarity in your English and pronunciation.

[jimviau]

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.

[bovine]

Great video, no god-awful background music (which is always too loud), or sound effects. Thanks Afrotech, you do good work.

Very intuitive explanation. You make excellent videos!! Please make more! One of the channels on YouTube that does make sense and is very educational down to the point you want. Lots of good examples and case scenarios.

[JohnyDays]

The world needs tons of people like you Sir....!
very well detailed explained...!
Thanks..!

[ChupoCro]

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.

[alanstarkie]

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!

[PreludeSon]

Why does people thumbs down on this video? This is very informative and useful information.

[silasfatchett]

Just as your other videos, a clear and concise explanation of an electronics concept. Thank you.

[thangbanben]

You're born to be a teacher! The explanation is easy to follow

[djfahed]

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.

[strg]

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.