What is the best Reverse Voltage Protection Circuit? || Repairing a Lab Bench Power Supply

[@ElectroBOOM]

I feel ... included! :D

[@RustieShackleFord]

ElectroBOOM where them free oscilloscopes at 👀

[@Guilherme_Parreira]

ElectroBOOM FUUULLLLBRIIIDGEEEETEKKTIFAIAAAAA

[@tesseract342]

so few seem to have seen this comment

[@johndah4x0r21]

Vodka + The smartest EE (electrical engineer) = *Bang!* [F--k! Sh--! What is this!? Ahh-F--k!]

[@BadMax02_VR]

so few saw it because the video was posted yesterday and only today he wrote a comment when the majority of the active subscribers have already watched the video

[@Kalvinjj]

That power supply has the weirdest heatsink I've ever seen and I love it

[@GrafRucola]

It’s so cool! BTW it’s common in other ELV LabPSUs as well :)

[@bretsutherlandsterriblemem8439]

Xbox One heatsinks are kinda strange too lol

[@daleburrell6273]

@@bretsutherlandsterriblemem8439 YOU BETCHER LIFESAVERS-!!!

[@ejezragaming2187]

Maybe the power supply gets hot quickly. So the big heat sink is used to make it cool. Why am I so nerd😂

[@mikeguy1899]

@@ejezragaming2187 very clever observation

[@ahndeux]

Scott always impresses me with his soldering skills. Amazing as always.

[@superdupergrover9857]

is it just me or is that the coolest looking heatsink? (1:33)

[@h3Xh3Xh3X]

It's either that or the most intense fleshlight...

[@pwnmeisterage]

Looks kinda mean. But also doesn't look very efficient, probably why it's an uncommon design, lol.

[@iblesbosuok]

Jealuosy

[@hariharanb785]

It'd nice if you could run a high static pressure fan sealed on that.

[@sebagomez4647]

It is indeed the coolest looking heatsink

[@paundra-lw1up]

If Tesla hired Electroboom... *car exploded* "NO REVERSE POLARITY PROTECTION, WHO DESIGN THIS SH*T?!"

[@prasana4047]

This cmt should go for 100 of likes

[@GRBtutorials]

At first I thought you meant Nikola Tesla and I was confused...

[@BruceNitroxpro]

paundra0217 , Really very funny because I don't own an electric car!

[@MohitSharmaxp]

Hi from 2021 Electroboom bought a Tesla

[@mircoheitmann]

remember kids, don't drink and charge

[@windshield11]

I bet that happens much more than you'd think. Especially if you're flying drones with the boys, then want to open some cold ones.

[@dj_paultuk7052]

Thanks, there will be a new EU law out next week now.

[@confusedwolf7157]

oooh harsh

[@paundra-lw1up]

Hahaha

[@gorillaau]

And be careful where you discharge... and never in a public place.

[@PelDaddy]

You might throw in a warning to test this out with a lower current battery rather than a high current SLA battery. A 12V SLA battery can easily dump enough current to fry decent sized wires and start fires. Don't ask me how I know. Always use a fuse with such batteries.

[@klong4128]

Very good scott ! I recalled 10 years ago when I taught industrial technicians/engineers ElectroPneumatics .The new laymen/greenHorn always causing 24v 10A power supply burnt. When I open out the CE or Industrial Professional power supply : The fast blown fuse never burn but others components burnt. Later I change the Fastest-fuse.Yet the same history happening .The last resort are buying two diodes lm4002. Same situation occuring.Finally I had to use lm4007 diodes, each connected inseries with + terminal and -terminal respectively. Good luck ,for more than ten years nothing Power Supply will ever burnt occuring !

[@nautitard]

I see it was an easy repair this time, but I would love to see you reverse engineer things and general repair tips and tricks. Maybe this isn't your cup of tea, but if it is, it'd be very interesting. I got into electronics largely because I like transforming what other people see as waste, into useful resources again. I've spent many hundred hours in my garbage room, salvaging parts, working electronic gadgets and also repairing and giving away or selling cheap. Through your channel, I started building things from scratch, but I would also like to develop my repairing skills. So I'd love to see more of you, repairing things and describing the most common causes of modern electronic devices failing :)

[@TheRainHarvester]

Torgny Nordén I just fixed a cheap multimeter on video. It's so satisfying to repair trash.

[@manuel_elor]

X2

[@charyenne]

The same happened to my power supply, I wanted to charge a RC car race pack with 7.2 volts and the output of the supply was shorted. You and Electoboom helped me to repair it. The revers protection circuit in a labory power supply is like this, because it dont has any effect on the current and voltage output and vorsmall loads (inductive spikes, capacitors) this version is perfect. Its not made to protect against big current and voltages.

[@evgerven1]

Inspite your explanation, I would still go for the reversed diode but added with a (reachable!) fuse. As in a good PSU design, the sensewires should be connected as close as possible to the load. The fuse can be quite overdimensioned compared to the PSU maximum current as the PSU has its own short circuit protection.

[@junuhunuproductions]

GREAT video! It was a little tricky to understand why fuse kept blowing & mosfet kept conducting currents when reverse-battery-voltage was applied, but all in all, great!

[@TheHeretic2011]

The best reverse polarity safety is a full wave rectifier.

[@backdoornutzer4461]

*BRIDGE

[@Eratas1]

FUULLLLLLLLL...

[@satibel]

FOOOOOOOOOOOOOL BRIDGE RECTI-FIRE!

[@jayzo]

Although you might have issues with higher loads. I put reverse current protection diodes on an LED driver I build with a dual power supply to stop each supply trying to force current through the other supply in reverse and tried forcing 5A through it (current required by the LEDs). Despite being rated for 10A a LOT of smoke came out of them and they exceeded 100C by the time I'd noticed.

[@johndah4x0r21]

+ElectroBOOM FOOL BRIDGE REKTIFAIIA!

[@thesneakinspider3193]

I began watching you clueless to the technical side. Now with you and some other instruction I am beginning to grasp this

[@m4gmu5hell]

Wow. Very nice to see a new GreatScott video on Friday ^^ I actually destroied a power supply at work also by connecting a big 12V Lead acid battery the wrong way around. Should have used this circuit ^^ Thanks for the advice!

[@renatoturkovic4299]

How Friday?Its uploaded on sunday!10 minutes ago!How is this comment old 2 days?ARE YOU TIME TRAVELING!!!

[@luongmaihunggia]

*destroyed

[@m4gmu5hell]

@@renatoturkovic4299 Patreon ma boiis ^^

[@ahmedsiddiqui9515]

How your comment is 2 days old ?

[@m4gmu5hell]

@@ahmedsiddiqui9515 Patreon ma boii ^^

[@boblewis5558]

There is another use to which an FET switch maybe used to good effect (no pun intended) and that is where you have a backup battery connecting to a circuit powered normally by an external source e.g. mains derived supply and where you want the battery to take over instantly on input power failure such as a bulkhead emergency light, especially as where I have one - above the fuseboard! An N-Channel FET can be used so that while the input source is present no battery current is used and no reverse current is possible either. Once the mains supply drops, the light turns on. Quite often, in fact usually, such lights are ALWAYS on and the battery constantly on charge and it just takes over on power fail. Not always what is required. Another similar usage is when an external charging voltage/current is going to be used to deliver charge current via an internally fitted DC-DC converter. e.g. external charge voltage of say 16 volts via a buck converter providing a 12.6 volt charging voltage to a 3S battery pack. In such cases the output of the charger (DC-DC Buck converter) cannot be left connected permanently to the battery since it will be receiving reverse voltage from the battery when the device is switched off and no external charge voltage is present. Fitting a single N-Channel FET with its Gate tied LOW to ground via say a 10k resistor i.e. turning off the gate, BUT a second gate resistor of 100k is connected to the INPUT charge voltage point of the buck converter. The output of the buck converter connected to the Drain, and the Source to the battery to be charged. When the charge voltage is present and the device turned off, the FET will turn on provided the input voltage of the buck converter is such that the difference between it and the output voltage is higher than the FET gate threshold, the output turns on and starts charging. I have recently used this exact technique to replace the old NiMh cells with Liion cells of TWO Dustbuster hand held vacuums and fitted internal charge circuits to them instead that operate in exactly this way so that when they are off and placed in their charge cradles (which can now be powered by ANY convenient 16-35 volt DC supply) they charge fine. As soon as they are unplugged the FET switches off and prevents the battery from reverse connection to the output of the buck converter which would otherwise drain the battery and also turn on the converter's output LED via the back-fed current!! This works GREAT. Especially as all the components needed were recovered from motherboards and suchlike! I included a BMS of course but also a battery status display with a button to manually show the state of charge when required but also it's auto switched by another FET when connected to the charge power.

[@melissacoleman9633]

This is one of the best channels on KZbin and because I watch this channel my electronics ability has soared. Thx

[@greatscottlab]

Nice. Glad you like it.

[@ZenPanda2023]

Finally. We'll be able to see what's inside after so many long years and countless videos in attendance.

[@BharatMohanty]

I guess this topic belongs to #electroboom 😀

[@omhekde]

Lol...

[@paundra-lw1up]

If Tesla hired Electroboom... *car exploded* "Damn, I put the electrolyte capacitor in the wrong way!"

[@BharatMohanty]

@@paundra-lw1up if Tesla hires electroboom he will electrify that factory's environment and that will be a shocking experience for all workers.

[@paundra-lw1up]

@@BharatMohanty LMAO

[@bkzzzzz]

yea with SHUNT and FULL BRIDGE :)

[@hqiu6828]

Just made the same mistake and blew my small 30V DC-DC module. I will try this Reverse Voltage Protection method. Many thanks!

[@ugetridofit]

There are circuits that use a relay in line with the load. The coil is driven by a circuit that detects very low reverse voltage and opens the relay.

[@FantaBH]

At first was thinking same video as many before but after watching you came to problem well known to me and as well finally someone who made video complete by showing right circuit at the end which will protect power supply on right way.

[@eformance]

Doesn't the cut-in voltage of the MOSFET limit the minimum voltage you can output from the power supply? It would seem to me that a virtual zener that drives a N channel MOSFET, via a proper driver chip, would be another solution with fewer drawbacks. N-channel MOSFETs tend to have a lower resistance too.

[@packratswhatif.3990]

Haha, been there - none it (blowing up my power supply). But you do have to love the power mosfet versions ! Just build it into your power supply and change the point where your power supply monitors the output voltage to the output of the mosfet protection circuit.

[@vedant3321]

You mentioned electroboom finally 😍

[@tf3confirmedbuthv54]

Your videos got me into this kinda thing and ended up convincing me to get a career in electrical engineering. Thank you

[@dawnminilla9299]

the circuit you found is a poor solution because after it is used once you have to remove the gate charge as the fet will stay conducting and when you try to hook a battery backwards it will be a short for a moment until the gate capacitance is discharged and the current can well exceed the maximum allowed by the fet. This generally will not fail right away but it does as I've built this exact circuit years ago for a charger we use at work and they fail about every 6 to 8 months. After an exhaustive look into the failure mechanism this is what I found. I measured sharp spikes in the 1000's amps using an irl60b216 once conducting and hooked up in reverse to a car battery

[@tannimkyraxx]

Failing to add some reverse polarity protection to my bitx40 ham radio, and subsequently figuring out how to stuff all the magic smoke inside sucked, but actually advanced my skills quite a bit.

[@kardeef33317]

I don't know if its just me, but the whole video from start to finish seemed like it was running 10% faster then normal. Awesome video and thanks again for sharing your knowledge.

[@Jindraxx20]

Thank you Scot for this content. It was very interesting the part regarding voltage vs current source protection.

[@Shocker99]

7:45 This isn't a new design. I've seen this circuit 15+ years ago. Depending on how you design it, it can also double a basic step down regulator.

[@tameralsebaee1433]

Thanks for video We can use a relay with a diode to protect from wrong polarity without voltage drop But must use same voltage for relay coil and for the load

[@runforitman]

No power supplies were harmed during the making of this video

[@brunobastos5533]

Fuses is probably another story

[@freevbucks8019]

Actually 1 power supply was repaired

[@hannes7893]

hey that's such a coincidence. I did the same a week ago and now am able to repair mine as well, thanks a lot

[@GRBtutorials]

And that's what "ideal diodes" are made of.

[@zeljkovelikipopovic]

Hvala Vam puno na korisnim savetima na vašem kanalu. Thank you very much for the helpful tips on your channel.

[@petzi8695]

Make a tube amplifier

[@InFAMOUSPS4_19]

When are we going to see a collaboration video between these 2? I know the distance is pretty great but still something I'd love to see in the future.

[@sergeantseven4240]

This is probably why using a lab power supply to charge a battery is not recommended. Battery charging circuits have protections built in for this reason.

[@GrulbGL]

Yeah... just a diode in series, than compensate the voltage...

[@monkeymanstones1]

I always check each and every connection with my multimeter before plugging power in and I check the battery terminals for current directivity before plugging anything in. Quick, easy and as safe as you can hope for (unless you're wearing jewelry - Example if you have a ratchet/socket in your Right hand and touch your socket to either terminal and don't realize you're touching your Left hand's wedding ring to the other terminal you instantly die as the power moves straight across your heart [it's right between your 2 arms & hands!] but good luck convincing anyone to remove their wedding rings when doing such work!).

[@rafgaming709]

Make a tube amp please! I know it is easier with solid state stuff but transistors will never beat the warm sound of tubes!

[@nerfinator03]

Lel

[@spu3]

Thank you for your time and effort to produce these excellent videos! You appear well versed in MOSFET selection. I have a reverse voltage polarity 6 - 8 VDC, 15 AMP (max) application I am evaluating that will require a low side N-Channel MOSFET. Any initial suggestions?

[@pauljackson2126]

What if I add a FULL BRIDGE REKTIFIYAA.......?

[@S1278-q9f]

FOOL BRIDGE*

[@sonicunleashedfan124]

God dammit

[@caua737]

Electroboom hahahaha

[@MrBobman49]

Zen you vill haf 1.4V drop across it and you missed the point.

[@josefaschwanden1502]

Voltage drop, but it would work

[@Krunalbhongade]

The diode in parallel is added generally to damp transient voltages which might happen during inductive loads... This parallel diode also happens to act as a reverse polarity protection. That parallel diode might be a TVS or a schottky diode.

[@ponchov.9116]

"It is bastards" - 0:38 (Enable automatic subtitles)

[@BHAVYAMATHURBEE]

Amazing video man! However you should have gone with the N-Channel MOSFET. N-Channel MOSFETs are generally way more cheaper, has a lower Rds(on) and gate junction capacitance. Means its cheap and power efficient. Keep making these videos man. I'm totally a fan. And I will see you next time!

[@QLTD]

I prefer sticking with the original method to get accurate voltage also mistakes happen once I don't think I will blow the diode again in the future 🙂

[@magicianofelectronics951]

I have destroyed one of my boost converter(bought after seeing on your channel), by connecting 3.7V 18650 battery in reverse, that is why I'm here, but in my case, diode will be good as I want to operate a solenoid mechanism for approximate 2 seconds, thank you

[@Dr.Mrugendra]

Best way for Reverse Voltage protection is DO NOT MESS WITH ELECTRONICS WHILE YOU R DRUNKED...!!! ;P ●●●●●●●●●●●●●●●●●●●●●●●

[@freevbucks8019]

no shit sherlock

[@rhogan88]

NFETs are better when it comes to low RDSon values because they are better carrier mobility. ~3 for the same given area. PFETs will also work but if we are optimizing...

[@lbgstzockt8493]

this system wouldnt be as bad if the diode could be swapped more easily

[@slrn832472577]

Maybe mounting a perf board on the back of the power supply that contains the diode on the outside of the power supply for ease of replacement.

[@davey2k12]

Could protect diode with a heavy latch relay on a separate power source disconnect the output when polarity is reversed or shorted

[@johnfrancisdoe1563]

Eric Daniels Just put the diode in a fuse holder. But encouraging internal repair of lab equipment is good outside the calibration industry.

[@davidjames1684]

I was testing 2 different 13.8V power supplies to pump up an air mattress and by accident, I forgot to disconnect one of them while energizing the other that was also connected, I guess it didn't like backfeeding power that way as it damage BOTH of the power supplies. Do you think I should try a similar fix (replace diodes) as you illustrated here?

[@doufasmilz485]

Can you do an ups?

[@JBPerformanceTV]

Up

[@Samuel-km5yf]

This is great! I just permanently modified my power supply by putting one of these circuits inside it. Now I’ll never have to worry about connecting it in reverse again!

[@johnavonvincentius1884]

What kind of power supply is it? What is the Max Voltage,Current and power.

[@greatscottlab]

ELV DPS5315 0-30V 0-3A

[@МаксимГрищенко-н1с]

An IRL5602S transistor can be used to protect a circuit with low power - 3.8 - 5 volts. It opens completely from the logic level of the signal (2-4 volts).

[@paundra-lw1up]

Ft. Electroboom

[@nassimkoubeissi5814]

Great tutorial You can use a thyristor with a relay When a reverse voltage detected by thyrisyor it triggers the relay and opens its switch note to use a Fast acting relay .

[@Asu01]

Pfft, reverse polarity protection is only for the weak.

[@MCsCreations]

😂

[@HobkinBoi]

Yep. Once you blow something up, you almost always remember to make sure you set up correctly.

[@BadMax02_VR]

if you work at a atomreactor you also dont a second chance yo make sure to always connect correctly or just thing that your city will blow up xD

[@domino52o26]

@@BadMax02_VR Technically not true but it was good humor. 7/10

[@confusedwolf7157]

quick...lets get to the chopper

[@ACTlVISION]

Can you make a video for "fast" charging multiple LiPo/18650s in parallel with parallel TP4056s and maybe polarity and overcurrent protection? Would be cool to see an alternative to buying a BMS and having a regulated charge voltage for "simpler" projects, since it's quite a bit cheaper. Keep up the awesome videos!

[@mattv9989]

uploaded 52 seconds ago, a comment from 2 days ago..........

[@greatscottlab]

Patreon supporters can watch earlier.

[@mattv9989]

oh that makes much more sense :D

[@beedslolkuntus2070]

@@greatscottlab Do you have patrons plans like rewards electroboom has 6 reward types....

[@Dust599]

the privilege of wealth...

[@confusedwolf7157]

that...is...sooooo specific

[@sudipbabudhakal7236]

We can use bridge rectifier as well, if drop of 2*0.7 voltage is acceptable with some power loss as well. Afterall device is protected as well, We can power up with any type of connection, either reverse or forward, and it work flawlessly for small power circuit.

[@Loundre3]

Or using something like this: www.ti.com/tool/tida-00858?keyMatch=smart%20bridge%20rectifier&tisearch=Search-EN-Everything

[@noweare1]

Loundre3 Nice, thanks for that.

[@renatoturkovic4299]

I never had problem with reverse voltage

[@danfishermen5362]

I had

[@RyutakuZaki]

1) you are starting with electronics 2) you’re a liar

[@andrewkieran8942]

There only two kinds of electronics hobbyists, those that have done this and those that will.

[@roygalaasen]

Until one day you had a problem with reverse voltage.

[@renatoturkovic4299]

@@RyutakuZaki Every time when I make circuit I always double check or triple check circuit for reverse polarity supply or capacitors

[@arphyl2815]

Quick question: Why not use an H-bridge config at the output rails? To make sure that the + and - rails remains as is. We used that in our project. 🤔 Although I see that the power efficiency and voltage drops will be some considerations.

[@gonun69]

Didn't watch the video yet. But... FULL BRIDGE RECTIFIER!

[@hedgehogthesonic3181]

And what is a *FULL BRIDGE RECTIFIER!* ?!?!?!?!?!?!?! I know it have some capacitors and stuffs but the function of it is unknown for me...

[@DFX2KX]

@@hedgehogthesonic3181 It's an arrangement of diodes that turns A/C current (which goes back and forth both ways) into DC current. It's not efficient however.

[@hedgehogthesonic3181]

@@DFX2KX DC only moves in one direction right ?

[@intheshell35ify]

"Horrible, inefficient, and useless" But tell us, how do you really feel?!? Love it.

[@DrHarryT]

"What is the best Reverse Voltage Protection Circuit?" As it has been for years...A diode and a fuse.

[@bjtaudio]

Try a SUP53P06-20 its on resistance is only 0.02Ohm for even less voltage drop. I would suggest mosfet protection, using a 10K resistor between the gate and -ve and strap a 12V Zener to clamp the gate voltage.

[@beedslolkuntus2070]

someone say hi to me.... Hi you person reading the comments!! have a good day

[@MRA_3]

Hello,how are you ?

[@satibel]

hi to me....

[@araigumakiruno]

hi from malaysia

[@sam_8a]

hi to me

[@dalenassar9152]

Greetings and salutations from way down south in Amite, Louisiana. Where are you?

[@nigeljohnson9820]

Some power supplies do not like power being supplied from the battery when the power supply is off. The old kings hill bench power supplies were damaged if the power supply was turned off with the battery still connected. My colleagues and I discovered this when the lab earth leakage circuit breaker was tripped while charging some lead acid batteries. I would be interested to know if your PSU suffers the same problem. As I recall the fault was the result of latch up in the voltage control op amp circuit when mains supply was restored with the battery still connected. As far as I can tell the MOSFET circuit does not resolve this problem, as current can flow through the intrinsic reverse diode between drain and source. In the preferred circuit, would it have not been better to run the driver transistor as an emitter follower to limit the MOSFET gate voltage to Vz-vbe..

[@hrishikeshgawas4579]

Hey nice video. I want to protect my power supply from reverse voltage when i am charging my batteries. I dont want to make a circuit and stick to adding a diode. Now I am not an electronic engineer so sorry in advance if I made a mistake but what I found for 1N5822 is max rectified forward current is 3A so it means that max curent that can go through it is 3A but my power supply delivers upto 8A so can I add 3 diodes in parallel?

[@sigilvii]

I've been working on a guitar effects pedal project and it needs reverse protection polarity. Some designs I've seen use the parallel diode setup like in your power supply but I've read a series diode is better. Planning to use a NTE585. The mosfet design is also out there and I'm considering it, but I think the diode is easier to implement.

[@zarielandaluz7710]

Excellent solution, regardless of the voltage dropping which can be calibrated with a predefined fine tuning and clear the offset. Can you make a video about charging/discharging super capacitors?

[@EGoksy]

Cool .. i just wondered what to do with my Arduino 20x Charger/Discharger-Tester for 18650 .. that i keep destroying (TP4056 burns out, and Arduino behaves strange :) ) by accident. I thought to use some mosfets too. Good video ;)

[@kwazar6725]

When charging batteries use a proper charger. My icharger detects all sorts of misconfigurations and as scotty said prevents fire..... you can get ics spevially made for a multitude of reverse current reverse polarity short cct and more.....

[@kwazar6725]

Scott . Maybe build an external all singing and dancing super protector with meters and leds. Maybe use the ltc devices or whatever...

[@chrismofer]

you could put a latching relay and diode to have close to no voltage loss and still a fiarly fast decoupling on reverse voltages

[@kepi765]

Genau mir ist auch leider der selbe Fehler passiert, aber gut dass es GreatScott gibt!

[@Zebra_Paw]

You should charge it to 13.8V. It says cyclic use, but you that's not what you are doing! For the protection, do it the other way with an N-channel mosfet, because they tend to have much lower resistance, like the IRF3205 (55V 0.008 ohm 110A)

[@freda5344]

sense the reverse current and mod the psu voltage f/b circuit - best way to fix this problem. Just a resistor/bjt sense on the reverse diode circuit.

[@BjornV78]

7:47 I think this is the type of protection that is used in modern commercial car batterychargers (trickle loader), they don't charge when the battery is below a certain voltage, and the + and - outputs are shortcircuit protected, because they don't carry a voltage when there is no battery connected.

[@xero110]

With this added information I’ll be making my own bench top power supply. Great video, thanks.

[@ronc1357]

Hello Great Scott: I don't know if this would interest you... I have an idea for a project for you... I am working on a wired remote control mini pontoon boat (wired so if something goes wrong I won't have to go swimming for it). What I want to do is make an ultrasound depth finder on it with an LCD display... It will all be controlled with an Arduion uno... The purpose for this is for fishing I would like to be able to drive the boat to where I intend to cast my line, and find the depth.

[@fredrickrari9338]

Would it be advisable to put a full bidge rectifier at the power input terminal so you wouldnt care too much which lead goes where?

[@ShomiTheGreat]

Back to jlcpcb advertising. Cool.

[@howardwang4348]

Add a relay and a shunt in series ,then use opamp to monitor the reverse voltage on the shunt, the opamp is triggered by reverse voltage and lock its output to trigger the relay to protect everything. I think my idea is the most efficient and reliable.

[@greatscottlab]

Yes, using a relay is always very power efficient......

[@MrAbrandao]

perheaps a comparator and a relay ? but will the relay be fast enough?

[@ARandomTroll]

you should do a video on active rectifiers and more "mosfet as diode" usecases. would be great for electrolysis power supplies.

[@WereReallyRelayCamping]

diodes against the reversed power supply were often fitted in equipment made for cars and trucks like cb radios, the diode was usually a 25a or 50a diode, and called in the repair trade as ''the idiot diode''

[@tyttuut]

I made a similar mistake with my $300 Rigol DP712. Fortunately their warranty is awesome.

[@peterdkay]

Interesting solution but it needs a battery connected to turn P-MOSFET on. So it will not work with passive loads. Maybe a 100k resistor from supply (+) to base of NPN to turn it ON with passive load. Any reverse connected battery will still switch NPN off.

[@sylkelster]

I have noticed an inverse relationship in bench power supplies between Chinesium and on-board circuit protection, with high accuracy.

[@ChristmasEve777]

I get the polarity right when I drink heavily. That only because I have Anderson powerpole connectors on all of my DC stuff so it's impossible for me to get it wrong :) I just can't crimp new Anderson connectors when I'm drinking.... oh, which I do!

[@freddymercury8556]

Coincidence......that happened to me a week ago as well. Feels like God answer my prayers!

[@nasimakhanam2445]

This is really a useful video

[@chrisakaschulbus4903]

i heard you will get the best results when you put your battery in the microwave... just multiply the Ah of the battery with the rated maximum voltage and you know how many watts your microwave should have for flawless charging. 10/10 totally recommended

[@damiandassen7763]

Can you do a video on your schematics drawing techniques. They are very neat and it would be nice to be able to draw them like yours.

[@kenmore01]

You had too much to drink. I applaude your candor!

[@Kaspar_NL]

Really great vid to show the 'flaw' of the design of your power supply including a fix!

[@mupschiplayz1802]

FINALLY a new video from Scott

[@greatscottlab]

Every Sunday ;-)

[@mupschiplayz1802]

Hey GreatScott, Could you give me the Amazon Link with i can support you?

[@Paul-gz5dp]

Simpler method is put a diode in parallel with the output terminals and a fuse in series with one of the terminals. Wrong voltage applied to the terminals causes the diode to conduct and blows the fuse, and in normal operation the fuse is the only thing in the circuit, as the forward voltage will only happen when reverse voltage is applied. That is cathode to positive and anode to negative terminal.

[@RyutakuZaki]

From the beginning Hehe I knew that you got inspired by electro boom. My two favorite channels :D