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

Поделиться
HTML-код
  • Опубликовано: 2 фев 2025

Комментарии • 945

  • @ElectroBOOM
    @ElectroBOOM 6 лет назад +2535

    I feel ... included! :D

    • @RustieShackleFord
      @RustieShackleFord 6 лет назад +110

      ElectroBOOM where them free oscilloscopes at 👀

    • @Guilherme_Parreira
      @Guilherme_Parreira 6 лет назад +136

      ElectroBOOM FUUULLLLBRIIIDGEEEETEKKTIFAIAAAAA

    • @tesseract342
      @tesseract342 6 лет назад +23

      so few seem to have seen this comment

    • @johndah4x0r21
      @johndah4x0r21 6 лет назад +40

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

    • @BadMax02_VR
      @BadMax02_VR 6 лет назад +8

      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
    @Kalvinjj 4 года назад +126

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

    • @GrafRucola
      @GrafRucola 4 года назад +5

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

    • @bretsutherlandsterriblemem8439
      @bretsutherlandsterriblemem8439 4 года назад

      Xbox One heatsinks are kinda strange too lol

    • @daleburrell6273
      @daleburrell6273 4 года назад

      @@bretsutherlandsterriblemem8439 YOU BETCHER LIFESAVERS-!!!

    • @ejezragaming2187
      @ejezragaming2187 3 года назад +1

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

    • @mikeguy1899
      @mikeguy1899 3 года назад +3

      @@ejezragaming2187 very clever observation

  • @mircoheitmann
    @mircoheitmann 6 лет назад +755

    remember kids, don't drink and charge

    • @windshield11
      @windshield11 6 лет назад +7

      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.

    • @TheSaabClinicUK
      @TheSaabClinicUK 6 лет назад +18

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

    • @confusedwolf7157
      @confusedwolf7157 6 лет назад +1

      oooh harsh

    • @paundra-lw1up
      @paundra-lw1up 6 лет назад +1

      Hahaha

    • @gorillaau
      @gorillaau 6 лет назад +4

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

  • @klong4128
    @klong4128 4 года назад +2

    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 !

  • @ahndeux
    @ahndeux 3 года назад +26

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

  • @paundra-lw1up
    @paundra-lw1up 6 лет назад +178

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

    • @prasana4047
      @prasana4047 4 года назад +3

      This cmt should go for 100 of likes

    • @GRBtutorials
      @GRBtutorials 4 года назад +3

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

    • @BruceNitroxpro
      @BruceNitroxpro 4 года назад +1

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

    • @MohitSharmaxp
      @MohitSharmaxp 3 года назад +1

      Hi from 2021 Electroboom bought a Tesla

    • @Splarkszter
      @Splarkszter 2 месяца назад

      Same thought about the PSU on the video lmao

  • @superdupergrover9857
    @superdupergrover9857 6 лет назад +257

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

    • @h3Xh3Xh3X
      @h3Xh3Xh3X 6 лет назад +66

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

    • @pwnmeisterage
      @pwnmeisterage 6 лет назад +19

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

    • @iblesbosuok
      @iblesbosuok 5 лет назад +1

      Jealuosy

    • @hariharanb785
      @hariharanb785 5 лет назад +4

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

    • @sebagomez4647
      @sebagomez4647 5 лет назад +3

      It is indeed the coolest looking heatsink

  • @charyenne
    @charyenne 4 года назад +2

    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.

  • @nautitard
    @nautitard 6 лет назад +6

    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
      @TheRainHarvester 6 лет назад +1

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

    • @manuel_elor
      @manuel_elor Год назад

      X2

  • @ZenPanda2023
    @ZenPanda2023 6 лет назад +1

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

  • @melissacoleman9633
    @melissacoleman9633 6 лет назад +6

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

  • @thesneakinspider3193
    @thesneakinspider3193 6 лет назад

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

  • @PelDaddy
    @PelDaddy 6 лет назад +20

    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.

    • @dwikey_98
      @dwikey_98 Месяц назад

      in fact, he used not only the fuse..
      in the video, the fuse is not popped because the mosfet stays off while reverse voltage and current happens..
      so the fuse only is not enough.. because the reverse voltage and current is already flows to the circuit before the fuse popped.. even the diode can blown up if that matter happens..
      but many electronics has no fully proper reverse polarity protection.. fuse and diode can prevent this..
      but, the diode can be very hot while reverse polarity happens.. and waste the power in form of heat, and even can blown up the diode if the voltages and current was too big..
      so the fuse is the last defender.. and mostly the current surge was already flowing to the circuit with harmful amount of current before the fuse is blown.. and the electronics circuits may already broken if that happens..
      so, the video is describing the whole point of this matters..

  • @hqiu6828
    @hqiu6828 3 года назад +1

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

  • @BharatMohanty
    @BharatMohanty 6 лет назад +334

    I guess this topic belongs to #electroboom 😀

    • @omhekde
      @omhekde 6 лет назад +1

      Lol...

    • @paundra-lw1up
      @paundra-lw1up 6 лет назад +45

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

    • @BharatMohanty
      @BharatMohanty 6 лет назад +5

      @@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
      @paundra-lw1up 6 лет назад

      @@BharatMohanty LMAO

    • @bkzzzzz
      @bkzzzzz 6 лет назад +6

      yea with SHUNT and FULL BRIDGE :)

  • @FantaBH
    @FantaBH 6 лет назад

    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.

  • @TheHeretic2011
    @TheHeretic2011 6 лет назад +215

    The best reverse polarity safety is a full wave rectifier.

    • @backdoornutzer4461
      @backdoornutzer4461 6 лет назад +52

      *BRIDGE

    • @Eratas1
      @Eratas1 6 лет назад +17

      FUULLLLLLLLL...

    • @satibel
      @satibel 6 лет назад +64

      FOOOOOOOOOOOOOL BRIDGE RECTI-FIRE!

    • @jayzo
      @jayzo 6 лет назад +11

      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
      @johndah4x0r21 6 лет назад +13

      +ElectroBOOM FOOL BRIDGE REKTIFAIIA!

  • @tf3confirmedbuthv54
    @tf3confirmedbuthv54 6 лет назад +1

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

  • @m4gmu5hell
    @m4gmu5hell 6 лет назад +10

    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
      @renatoturkovic4299 6 лет назад +5

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

    • @luongmaihunggia
      @luongmaihunggia 6 лет назад

      *destroyed

    • @m4gmu5hell
      @m4gmu5hell 6 лет назад +6

      @@renatoturkovic4299 Patreon ma boiis ^^

    • @ahmedsiddiqui9515
      @ahmedsiddiqui9515 6 лет назад

      How your comment is 2 days old ?

    • @m4gmu5hell
      @m4gmu5hell 6 лет назад +1

      @@ahmedsiddiqui9515 Patreon ma boii ^^

  • @hannes7893
    @hannes7893 6 лет назад +1

    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

  • @evgerven1
    @evgerven1 6 лет назад +9

    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
    @junuhunuproductions 6 лет назад +2

    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!

  • @eformance
    @eformance 6 лет назад +8

    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.

  • @boblewis5558
    @boblewis5558 4 года назад +1

    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.

  • @vedant3321
    @vedant3321 6 лет назад +30

    You mentioned electroboom finally 😍

  • @zeljkovelikipopovic
    @zeljkovelikipopovic 6 лет назад

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

  • @ugetridofit
    @ugetridofit 6 лет назад +3

    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.

  • @Jindraxx20
    @Jindraxx20 5 месяцев назад

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

  • @kardeef33317
    @kardeef33317 6 лет назад +4

    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.

  • @packratswhatif.3990
    @packratswhatif.3990 6 лет назад +1

    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.

  • @runforitman
    @runforitman 6 лет назад +7

    No power supplies were harmed during the making of this video

  • @Samuel-km5yf
    @Samuel-km5yf 5 лет назад +1

    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!

  • @GRBtutorials
    @GRBtutorials 6 лет назад +7

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

  • @monkeymanstones1
    @monkeymanstones1 6 лет назад +1

    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!).

  • @Shocker99
    @Shocker99 5 лет назад +3

    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.

  • @mupschiplayz1802
    @mupschiplayz1802 6 лет назад +1

    FINALLY a new video from Scott

    • @greatscottlab
      @greatscottlab  6 лет назад +1

      Every Sunday ;-)

    • @mupschiplayz1802
      @mupschiplayz1802 6 лет назад

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

  • @dawnminilla9299
    @dawnminilla9299 4 года назад +4

    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

  • @kepi765
    @kepi765 6 лет назад

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

  • @rich1051414
    @rich1051414 6 лет назад +3

    Why use a silicone solution when you can use a relay for reverse voltage protection? Pricey, but you get no voltage drop, no heat generation. It surprises me how so few people show using a relay to make a truly ideal diode.

  • @tameralsebaee1433
    @tameralsebaee1433 6 лет назад +1

    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

  • @pauljackson2126
    @pauljackson2126 6 лет назад +37

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

  • @bjl1000
    @bjl1000 4 года назад

    I can't believe you spent almost 9 minutes on this!

  • @ponchov.9116
    @ponchov.9116 5 лет назад +12

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

  • @arphyl2815
    @arphyl2815 4 года назад +1

    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.

  • @petzi8695
    @petzi8695 6 лет назад +32

    Make a tube amplifier

  • @davidjames1684
    @davidjames1684 5 лет назад +1

    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?

  • @sergeantseven4240
    @sergeantseven4240 6 лет назад +5

    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
      @GrulbGL 5 лет назад +1

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

  • @magicianofelectronics951
    @magicianofelectronics951 4 года назад

    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

  • @lbgstzockt8493
    @lbgstzockt8493 6 лет назад +10

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

    • @slrn832472577
      @slrn832472577 6 лет назад +2

      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
      @davey2k12 6 лет назад

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

    • @johnfrancisdoe1563
      @johnfrancisdoe1563 5 лет назад +1

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

  • @tannimkyraxx
    @tannimkyraxx 6 лет назад +1

    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.

  • @Asu01
    @Asu01 6 лет назад +107

    Pfft, reverse polarity protection is only for the weak.

    • @MCsCreations
      @MCsCreations 6 лет назад

      😂

    • @HobkinBoi
      @HobkinBoi 6 лет назад +11

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

    • @BadMax02_VR
      @BadMax02_VR 6 лет назад +4

      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
      @domino52o26 6 лет назад +6

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

    • @confusedwolf7157
      @confusedwolf7157 6 лет назад

      quick...lets get to the chopper

  • @fredrickrari9338
    @fredrickrari9338 6 лет назад +1

    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?

  • @rafgaming709
    @rafgaming709 6 лет назад +4

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

  • @xero110
    @xero110 6 лет назад

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

  • @Mrugendraa
    @Mrugendraa 6 лет назад +10

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

  • @nigeljohnson9820
    @nigeljohnson9820 6 лет назад +1

    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..

  • @doufasmilz485
    @doufasmilz485 6 лет назад +5

    Can you do an ups?

  • @nasimakhanam2445
    @nasimakhanam2445 6 лет назад +1

    This is really a useful video

  • @QLTD
    @QLTD 6 лет назад +3

    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 🙂

  • @Krunalbhongade
    @Krunalbhongade 6 лет назад +1

    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.

  • @paundra-lw1up
    @paundra-lw1up 6 лет назад +28

    Ft. Electroboom

  • @BHAVYAMATHURBEE
    @BHAVYAMATHURBEE 6 лет назад +1

    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!

  • @johnavonvincentius1884
    @johnavonvincentius1884 6 лет назад +3

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

  • @Albert-fe1xn
    @Albert-fe1xn 4 года назад

    I almost watched all of your videos, Not knowing Im not yet subscribe, and Now I subscribed that's why I made a Comment. HAHAHA. GREAT VIDEOS VERY INFORMATIVE AND HELPFUL. WATCHING FROM THE PHILIPPINES 😂

  • @mattv9989
    @mattv9989 6 лет назад +15

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

    • @greatscottlab
      @greatscottlab  6 лет назад +28

      Patreon supporters can watch earlier.

    • @mattv9989
      @mattv9989 6 лет назад +5

      oh that makes much more sense :D

    • @beedslolkuntus2070
      @beedslolkuntus2070 6 лет назад

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

    • @Dust599
      @Dust599 6 лет назад +2

      the privilege of wealth...

    • @confusedwolf7157
      @confusedwolf7157 6 лет назад +1

      that...is...sooooo specific

  • @RyutakuZaki
    @RyutakuZaki 6 лет назад +2

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

  • @beedslolkuntus2070
    @beedslolkuntus2070 6 лет назад +12

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

    • @MRA_3
      @MRA_3 6 лет назад +1

      Hello,how are you ?

    • @satibel
      @satibel 6 лет назад +2

      hi to me....

    • @araigumakiruno
      @araigumakiruno 6 лет назад +1

      hi from malaysia

    • @sam_8a
      @sam_8a 6 лет назад +1

      hi to me

    • @dalenassar9152
      @dalenassar9152 6 лет назад

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

  • @hrishikeshgawas4579
    @hrishikeshgawas4579 3 года назад +1

    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?

  • @renatoturkovic4299
    @renatoturkovic4299 6 лет назад +7

    I never had problem with reverse voltage

    • @danfishermen5362
      @danfishermen5362 6 лет назад +1

      I had

    • @RyutakuZaki
      @RyutakuZaki 6 лет назад +7

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

    • @andrewkieran8942
      @andrewkieran8942 6 лет назад +6

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

    • @roygalaasen
      @roygalaasen 6 лет назад +3

      Until one day you had a problem with reverse voltage.

    • @renatoturkovic4299
      @renatoturkovic4299 6 лет назад +1

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

  • @intheshell35ify
    @intheshell35ify 6 лет назад +2

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

  • @DrHarryT
    @DrHarryT 6 лет назад +3

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

  • @kenmore01
    @kenmore01 3 года назад

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

  • @gonun69
    @gonun69 6 лет назад +3

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

    • @hedgehogthesonic3181
      @hedgehogthesonic3181 6 лет назад

      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
      @DFX2KX 6 лет назад

      @@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
      @hedgehogthesonic3181 6 лет назад

      @@DFX2KX DC only moves in one direction right ?

  • @Detonador7G
    @Detonador7G 4 года назад

    Hey, I might be a bit late but at 5:27 the mosfet in ON so the diode is shortened, and therefore you don't have that 1.3V drop.

  • @freddymercury8556
    @freddymercury8556 6 лет назад +2

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

  • @sudipbabudhakal7236
    @sudipbabudhakal7236 6 лет назад

    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
      @Loundre3 6 лет назад

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

    • @noweare1
      @noweare1 6 лет назад

      Loundre3 Nice, thanks for that.

  • @chrismofer
    @chrismofer 6 лет назад +2

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

  • @BjornV78
    @BjornV78 4 года назад

    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.

  • @nassimkoubeissi5814
    @nassimkoubeissi5814 5 лет назад

    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 .

  • @InFAMOUSPS4_19
    @InFAMOUSPS4_19 2 года назад +2

    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.

  • @ShomiTheGreat
    @ShomiTheGreat 6 лет назад

    Back to jlcpcb advertising. Cool.

  • @nil3010
    @nil3010 3 года назад

    That heat sink looks Dope

  • @agstechnicalsupport
    @agstechnicalsupport 5 лет назад

    Thank you for posting such an instructive and practical video on reverse voltage protection circuits !

  • @Kaspar_NL
    @Kaspar_NL 6 лет назад

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

  • @МаксимГрищенко-н1с
    @МаксимГрищенко-н1с 3 года назад

    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).

  • @sylkelster
    @sylkelster 4 года назад +1

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

  • @jacobkransteiner6519
    @jacobkransteiner6519 6 лет назад +1

    Hey scott
    Do you have an idea to protect an electronic device which has to be kept right to a lightning protection device against "bad lightninh voltages"?
    I first thought about a tsv diode but i think affordable ones are not suitable for this task...

  • @tyttuut
    @tyttuut 6 лет назад

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

  • @naderhumood
    @naderhumood 5 лет назад +2

    Great vedio God bless you and your power supply. ....👍

  • @howardwang4348
    @howardwang4348 4 года назад +1

    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
      @greatscottlab  4 года назад

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

    • @MrAbrandao
      @MrAbrandao 4 года назад

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

  • @ytubeleo
    @ytubeleo 3 года назад

    In the circuit at 08:05, will the power supply be able to turn on to power external resistive loads (e.g., lightbulb)? And if so, why? It looks like it will be off all the time unless an external positive voltage supply/battery is connected. This could probably be fixed by using a resistor to pull up the MOSFET's drain to positive to use the internal power supply's voltage to turn on the circuit.

  • @JensHeuschkel
    @JensHeuschkel 3 года назад +1

    Is there a IC available for the circuit shown last ?

  • @rhogan88
    @rhogan88 6 лет назад +2

    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...

  • @bjtaudio
    @bjtaudio 5 лет назад

    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.

  • @Unmannedair
    @Unmannedair 6 лет назад

    Nice demo. Will probably use.

  • @xyzxyz-y1b
    @xyzxyz-y1b 9 месяцев назад +1

    you can use a simple full bridge rectifier

  • @KerbalLauncher
    @KerbalLauncher 6 лет назад +1

    What about using an ideal diode driver and nchannel mosfet, pchannel mosfet electrical characteristics are inferior and costly in the higher performance ranges.

  • @Niaiss
    @Niaiss 6 лет назад

    Интересное решение с минимум деталей.👍электронный предохранитель и блок защиты👍

  • @lazal3m
    @lazal3m 6 лет назад +1

    Will this reverse voltage protection circuitry affect the voltage and current readings when using on load?

    • @cbcdesign001
      @cbcdesign001 6 лет назад +1

      Yes it will affect the voltage regulation due to the drain to source resistance in the mosfet. A fuse to protect the diode is the simplest way to protect the PSU without affecting the voltage regulation.

    • @lazal3m
      @lazal3m 6 лет назад

      If the PSU can supply 10A, what amp rating of fuse would be optimal as reverse protection?

  • @trippy7415
    @trippy7415 Год назад

    Hey! Great Video! but I'm wondering what would happen if you were to connect the power supply backwards, would the circuit still protect against this type of reverse connection? is it even possible to create a circuit that would protect against both types of reverse connection?