80 Comments

  1. October 25, 2011 at 6:28 am

    Arash Toudeshki

    Reply
  2. June 26, 2012 at 5:47 pm

    lukeypoop1

    ny1 spot the MR T at 40 seconds

    Reply
  3. August 8, 2012 at 12:06 pm

    Rogier Willems

    Any suggestions on how to remove any ripples and noise from the power? I
    need clean power for my audio.

    Reply
  4. August 26, 2012 at 12:49 pm

    kyle biskup

    if i wanted to turn 24v, to around 3.5v…..what resistors would i need?

    Reply
  5. September 7, 2012 at 10:22 pm

    sharpbiohazard

    I loled at 2:12

    Reply
  6. September 12, 2012 at 2:26 am

    Luthmark Manuel

    i would like to create voltage regulator of 0-50v range…can i use the
    lm317?? and do you know any software wherein i can check it,,i use circuit
    wizard but i can’t find the lm317 on the software

    Reply
  7. October 18, 2012 at 4:40 pm

    FLORINMX

    Nice tutorial and very well explained.

    Reply
  8. November 3, 2012 at 8:22 am

    Krocko2233

    Can I use 2 SMD electrolytic capacitors with these ratings (0.1 and 1)
    instead of one ceramic and one standard electrolytic? Thanks for your
    answer.

    Reply
  9. November 3, 2012 at 10:42 am

    Krocko2233

    He multiplied R2 by 1.25 to get rid of the latter, which gives
    4700*1.25=5875

    Reply
  10. December 28, 2012 at 4:52 pm

    haineux

    Google “LM317 datasheet.” The datasheet says that the maximum input voltage
    is 40V, so nope.

    Reply
  11. December 28, 2012 at 4:57 pm

    haineux

    If you want the cleanest “audiophile” power, run off batteries. If you want
    to make this circuit have minimal noise, increase C2 to 1000µF or more.
    (Note, if you increase it a LOT, the output voltage will take a while to
    get from 0V up to the set voltage. This MIGHT cause unusual sounds during
    power on. I don’t think it will ruin your device, but I won’t guarantee
    that!)

    Reply
  12. December 30, 2012 at 1:20 am

    Harshal Sarode

    sir i have one question i got something like a potentiometer from a mouse
    it was placed in the mouse wheel can you tell me if that is a potentiometer
    or is that any other device

    Reply
  13. January 13, 2013 at 10:50 pm

    Víctor Gibrán Moreno Zárate

    Is there any way to create an adjustable voltage supply from 0 to 25V ?
    Because I had a teacher who told us that is possible, but he never showed
    us how…. (sorry about my bad english)

    Reply
  14. February 10, 2013 at 7:53 pm

    Oeurn Many

    LM317 Adjustable Voltage Regulator Tutorial

    Reply
  15. February 24, 2013 at 10:49 am

    nurul rashid

    is there any way to split a dc source. like making two 5 and 7 volt sources
    form a 12 volt source. and thanks a lot for these awesome vids… you rock
    m/

    Reply
  16. March 14, 2013 at 9:59 pm

    rayray novak

    is that the 1.25 is the constant value? in the formula

    Reply
  17. May 23, 2013 at 8:53 am

    Munky332

    whats the maximum amperage rating for this? I need to convert 12v (or
    rather, ~13.6v) DC to 16-18V @ 18-20amp max. how do i increase the maximum
    amperage rating? the input voltage would be off a car battery/running car
    voltage.

    Reply
  18. May 28, 2013 at 7:47 am

    The Phanotm

    0:40 right side of video 🙂

    Reply
  19. June 13, 2013 at 9:28 am

    Mohamed Bouhrid

    LM317 Adjustable Voltage Regulator Tutorial

    Reply
  20. June 18, 2013 at 2:16 pm

    lookkool3

    i dont understand the math … =( do you know of any books where i can
    learn the basic formulas? cause right now i just been getting schematics
    and putting things together but i have no understanding of the math behind
    any of the project i do

    Reply
  21. June 21, 2013 at 11:52 pm

    Meorasaruddin Asaruddinahmad

    ASARUDDINAHMAD TERENGGANU

    Reply
  22. July 2, 2013 at 2:44 pm

    Afrotechmods

    Yup

    Reply
  23. July 29, 2013 at 6:06 pm

    Afrotechmods

    Kinda. What you really want to do is have 1 transformer with multiple
    windings on the secondary side to give you the multiple voltages.

    Reply
  24. August 3, 2013 at 2:23 pm

    Brian Chrismon

    Hey, great video. I have a question you may be able to help with. I’m doing
    an RC wheel chair mod and I need to get a 6v power supply to output 2.5v
    positive AND 2.5v negative. Using the LM317 and various resistors i’m able
    to get the positive current right in the butter zone but the negative is
    always around -3.8 or so. Would you have any suggestions on what I would
    need to regulate the negative current and how to do that? Thanks!

    Reply
  25. August 4, 2013 at 8:23 am

    Joshua Dumbleton

    MR. T

    Reply
  26. August 6, 2013 at 11:26 pm

    ThunderWiring

    can you use a non-adjustable regulator(like L7809) with the potentiometer
    to get variety of output voltages?!

    Reply
  27. August 11, 2013 at 6:15 pm

    Keith Lau

    I pity the poor fool that didn’t catch the Easter egg!

    Reply
  28. August 26, 2013 at 6:27 am

    mulu hailu

    Thanks.

    Reply
  29. October 26, 2013 at 4:21 pm

    John Wayne

    Great vid, but you can avoid using thi specialty reg and use regular 7805,
    7809, 7812, 7815…..etc. You use the same potentiometer trick and this
    creates a floating ground circuit so the IC still ‘thinks’ it is regulating
    a lower voltage. These are generally good to about 35 volts DC output max.
    But a great set of videos overall. Say, what brand of O scope would you
    recommend if one does not want spend top dollar ( i’d rather have more
    frequency in exchange! ) thanks

    Reply
  30. November 11, 2013 at 12:14 pm

    Angel Farrera

    thanks it help out with my homework XD, great videos

    Reply
  31. November 30, 2013 at 8:20 pm

    Marco Castillo

    thank you so much 🙂

    Reply
  32. December 10, 2013 at 11:27 am

    Rob H

    Those LM317, I pay 24 cents.

    Reply
  33. December 25, 2013 at 5:30 am

    Billy .Rice

    Could could help me with a voltage regulator that will run off of 120 v AC
    and be adjustable to 1.5-37 volts DC?

    Reply
  34. December 27, 2013 at 6:15 pm

    Supijah armini

    can i use ka317?

    Reply
  35. January 4, 2014 at 2:03 pm

    zacisyahu

    Can i use a LM1117 in place of the 317 ?

    Reply
  36. January 20, 2014 at 11:05 pm

    Mike Novo

    how and where would someone hook up the rheostat to just limit current.
    Racking my brain and hoping not to burn the house.

    Reply
  37. January 21, 2014 at 2:02 pm

    Open Source Hardware Group

    Awesome and clear – Thanks!

    Reply
  38. January 22, 2014 at 10:56 am

    matthew Kubiak

    what would be a 3 or 6 amp version of the LM317??

    Reply
  39. January 28, 2014 at 3:35 am

    SVAFnemesis

    You didn’t say you used 12V as input and I had to guess

    Reply
  40. February 28, 2014 at 8:14 pm

    Ibend Wires

    Awesome video Sir. Thank you 🙂

    Reply
  41. March 6, 2014 at 10:28 pm

    compwolf2

    this may sound weird, but I have a similar adjustable regulator that I used
    and it runs along the same base as the LM317. The AMS 1117 ADJ is set up
    the same way, however the formula has nothing to do with it at all what so
    ever. It turns up, it only needs a resistor on the Adj/Grd pin to positive
    and use the ground as normal and I can adjust to any voltage I want. If
    the out pin is connected in any way, the voltage is not regulated (i.e 5
    volts in, 5 volts out if the out pin is connected to anything in any way.)
    I’ve tried extremes for resistance on either R1 or R2, 10 Mohms, 30 Mohms,
    etc…. nothing, even connecting things to purposely short out the OUT from
    the adjust pin. if the out pin is connected it wont bother going through
    anything else it will be what ever the input is. Any ideas?

    Reply
  42. March 11, 2014 at 9:58 am

    Daniel Kimbril

    i am wanting to use a -12v rail and a 12v rail and use the potentiometer to
    adjust between 3.3v and 24v. is the LM317 ok to handle this?

    Reply
  43. March 21, 2014 at 5:49 pm

    NZHorizones

    When you are talking about the resulting heat created can we add this value
    to the total consumption of the device we are powering?

    Reply
  44. March 30, 2014 at 6:40 pm

    Joe Blow

    Thanks! Works great with a computer power supply. Since a cpu power supply
    has -12v and +12v and voltage is equal to the difference, you can use the
    -12v as the ground instead of a 0v ground and get a variable 24v.

    Reply
  45. May 6, 2014 at 1:48 am

    Dust Devil

    Let’s say that I have a wide-range input voltage (say, 1-volt to 20 volts),
    but I want to use a fixed output voltage of 13.7 volts. Can the LM317T
    accept that much power without smoking it, if I give it a large enough
    heat-sink? I am wanting to build a custom voltage regulator to work for a
    remote DC gen to lead-acid storage cell system, where the charge is
    supplied by a windmill. In theory, this is the same circuit used in older
    cars (voltage regulator preventing overcharge from alternator). Am I
    missing something, or is the voltage regulator on an older automobile not a
    similar circuit?

    Reply
  46. May 12, 2014 at 3:10 pm

    Flofy387

    This is cool 😛

    Reply
  47. May 17, 2014 at 11:55 am

    GameCyborg

    Durasmell xD

    Reply
  48. May 19, 2014 at 9:40 pm

    Coughtry

    Can someone explain to me how 50farad*4.7Kohms=0.485+1V=1.485v.
    I’m a bit rusty on my conversions, but I tried converting Farads to ohms*R2
    then convert to volts and did not get what I was displayed in this
    presentation.
    O*F=v, V/F=O…
    200o*3F=600V, 600v/3F=200o/600v=3f

    Thanks

    Reply
  49. May 21, 2014 at 4:49 pm

    Archie Quinones

    i tried wiring the circuit with the potentiometer… i checked my design
    but i keep burning the potentiometer… why is that?

    Reply
  50. May 30, 2014 at 2:58 pm

    Daniel Roberto Íñiguez Villa

    Thanks a lot! This is great!!

    Reply
  51. June 2, 2014 at 3:55 pm

    leviterande

    im so goddamn inlove with transistors, but tubes got it still thou

    Reply
  52. June 5, 2014 at 6:14 pm

    Aidan Gieg

    Anyone else like the durasmell joke? 😀

    Reply
  53. June 7, 2014 at 2:03 pm

    175griffin

    so if i have a 3 volt input and a 2 volt output, what will my current be
    limited to?

    Reply
  54. June 8, 2014 at 10:27 am

    Toadsb

    Reply
  55. June 8, 2014 at 10:31 am

    Iain Geoghan

    Reply
  56. June 15, 2014 at 1:29 pm

    Sanczo Pan

    And How do we do to have the proper current ? Does it adjust by itself ?

    Reply
  57. June 27, 2014 at 1:25 pm

    MrZabazuba

    lol anyone noticed Mr. Ts face pop up when he said “LM317T or LM317AT”

    Reply
  58. July 3, 2014 at 12:10 am

    John Kerley

    I did not get that ” 50u ” part of the equation either!

    Reply
  59. July 4, 2014 at 12:00 pm

    John Kerley

    Thanks, I really should have known that,I saw that later also explained on
    another video. Most videos neglect that part of the equation, they say
    because the difference it makes to the outcome in most instances is
    miniscule.

    Reply
  60. July 4, 2014 at 12:51 pm

    Sergio Aguilar

    The only fail I detect is that heat is a type of energy, not power

    Reply
  61. July 13, 2014 at 8:23 am

    Jay s

    Hi could you use an adjustable voltage regulator with two 12 volt
    batteries, so you could have adjustable power from 1 volt to 24 volts

    Reply
  62. July 23, 2014 at 1:59 am

    Krisztián Szirtes

    There’s a webpage in my country called hestore, and they sell the LM317T
    for 45 cents 😀

    Reply
  63. July 26, 2014 at 7:34 am

    LimeTrace

    Useful tutorial on how to use the LM317 voltage regulator

    Reply
  64. July 29, 2014 at 12:45 pm

    mantamihai1

    Can I use this to charge a battery via solar panel?I mean,if the solar
    panel produces 40 v can i use this setup to charge a 12v battery?

    Reply
  65. July 31, 2014 at 2:37 pm

    Gunhaver

    this is by far the best explanation of how to use a LM317. None of the
    other literature i found gave guidelines and explained what happens when
    the Vin and Vout are wildly different. This video was awesome

    Reply
  66. August 9, 2014 at 12:38 pm

    Krisztián Szirtes

    Am I the only one who notiiced Mr T at 0:40? 😀

    Reply
  67. August 19, 2014 at 1:36 pm

    Nolan Sandidge

    Let’s say I need 5V at up to 2A of current drawn. How big of a heatsink
    should I use, and what value resistors do I need?

    Reply
  68. August 20, 2014 at 11:48 am

    José Ramón Bracamonte

    Thanks dude, really helped me!

    Reply
  69. September 16, 2014 at 11:45 am

    Joshua Tulberg

    Awesome video!
    What would be the next-best alternative to a linear voltage regulator if
    you were looking for something more efficient?

    Reply
  70. September 21, 2014 at 3:02 pm

    Gurkdream

    Im a bit confused after opening up a high end power suply (advanced 19 volt
    6 amp SMPS) and finding loads of N channel mosfets. Googling these
    (“45nq10t” and “k3797”) says the application is dc to dc conversion and
    SMPS’s but what makes them different than Voltage regulators? Could they do
    the job?

    Reply
  71. September 24, 2014 at 2:13 am

    Nassir Daoud

    I would like to build this device for automotive usage. I would not need it
    to handle very much amperage. Since the range of usage would be from half a
    volt to 12 volts (with little to no amperage), I need to be able to
    determine how much output voltage is being supplied . If I were to place a
    digital volt meter on the output side of this device , would it affect the
    out put voltage ?

    Reply
  72. September 28, 2014 at 6:53 pm

    James Hanley

    the last power supply i built with lm317 gave an output of up to 40 volts

    Reply
  73. October 12, 2014 at 1:03 pm

    Gord Slater

    “Durasmell” – love it 🙂

    Reply
  74. October 20, 2014 at 9:11 pm

    Stephen Jones

    Do It !

    Reply
  75. November 10, 2014 at 10:22 am

    song ho the

    toi la nguoi sua chua,thong thuong bay gio toi rat thich mon dien tu,rat
    mong i kien dong gop tu cac ban,

    Reply
  76. November 18, 2014 at 9:53 am

    Jackz Gamer

    Does this circuit adjust amp?
    Because i’ve got a 24v 1.1ah power supply and i want to adjust voltage, but
    i also want to keep amp

    Reply
  77. November 24, 2014 at 2:58 pm

    MasterMind

    Can LM317 use to replace car alternator voltage regulator?

    Reply
  78. November 30, 2014 at 10:02 am

    Kavindu Gilshan

    please upload more videos about electronics …
    thank you very much 🙂

    Reply
  79. November 30, 2014 at 8:46 pm

    gregsbest

    Hi Afro, Great video and easy to learn with your clear straightforward
    videos.
    I will be sure to link to your Amazon.com page in the future. Glad to do it
    .!
    Cheers, G.

    Reply
  80. December 1, 2014 at 3:08 am

    abdoexa

    Lm317 has current limitation i think 1.5 A when i test it with big Rc Car
    7.5v , i put ,12v Lithium useless laptop battery it doesn’t work , i used
    L200.it works .

    Reply

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