1. October 25, 2011 at 6:28 am

    Arash Toudeshki

  2. June 26, 2012 at 5:47 pm


    ny1 spot the MR T at 40 seconds

  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.

  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?

  5. September 7, 2012 at 10:22 pm


    I loled at 2:12

  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

  7. October 18, 2012 at 4:40 pm


    Nice tutorial and very well explained.

  8. November 3, 2012 at 8:22 am


    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

  9. November 3, 2012 at 10:42 am


    He multiplied R2 by 1.25 to get rid of the latter, which gives

  10. December 28, 2012 at 4:52 pm


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

  11. December 28, 2012 at 4:57 pm


    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

  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

  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)

  14. February 10, 2013 at 7:53 pm

    Oeurn Many

    LM317 Adjustable Voltage Regulator Tutorial

  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

  16. March 14, 2013 at 9:59 pm

    rayray novak

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

  17. May 23, 2013 at 8:53 am


    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

  18. May 28, 2013 at 7:47 am

    The Phanotm

    0:40 right side of video 🙂

  19. June 13, 2013 at 9:28 am

    Mohamed Bouhrid

    LM317 Adjustable Voltage Regulator Tutorial

  20. June 18, 2013 at 2:16 pm


    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

  21. June 21, 2013 at 11:52 pm

    Meorasaruddin Asaruddinahmad


  22. July 2, 2013 at 2:44 pm



  23. July 29, 2013 at 6:06 pm


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

  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!

  25. August 4, 2013 at 8:23 am

    Joshua Dumbleton

    MR. T

  26. August 6, 2013 at 11:26 pm


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

  27. August 11, 2013 at 6:15 pm

    Keith Lau

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

  28. August 26, 2013 at 6:27 am

    mulu hailu


  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

  30. November 11, 2013 at 12:14 pm

    Angel Farrera

    thanks it help out with my homework XD, great videos

  31. November 30, 2013 at 8:20 pm

    Marco Castillo

    thank you so much 🙂

  32. December 10, 2013 at 11:27 am

    Rob H

    Those LM317, I pay 24 cents.

  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?

  34. December 27, 2013 at 6:15 pm

    Supijah armini

    can i use ka317?

  35. January 4, 2014 at 2:03 pm


    Can i use a LM1117 in place of the 317 ?

  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.

  37. January 21, 2014 at 2:02 pm

    Open Source Hardware Group

    Awesome and clear – Thanks!

  38. January 22, 2014 at 10:56 am

    matthew Kubiak

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

  39. January 28, 2014 at 3:35 am


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

  40. February 28, 2014 at 8:14 pm

    Ibend Wires

    Awesome video Sir. Thank you 🙂

  41. March 6, 2014 at 10:28 pm


    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?

  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?

  43. March 21, 2014 at 5:49 pm


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

  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.

  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?

  46. May 12, 2014 at 3:10 pm


    This is cool 😛

  47. May 17, 2014 at 11:55 am


    Durasmell xD

  48. May 19, 2014 at 9:40 pm


    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
    O*F=v, V/F=O…
    200o*3F=600V, 600v/3F=200o/600v=3f


  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?

  50. May 30, 2014 at 2:58 pm

    Daniel Roberto Íñiguez Villa

    Thanks a lot! This is great!!

  51. June 2, 2014 at 3:55 pm


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

  52. June 5, 2014 at 6:14 pm

    Aidan Gieg

    Anyone else like the durasmell joke? 😀

  53. June 7, 2014 at 2:03 pm


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

  54. June 8, 2014 at 10:27 am


  55. June 8, 2014 at 10:31 am

    Iain Geoghan

  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 ?

  57. June 27, 2014 at 1:25 pm


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

  58. July 3, 2014 at 12:10 am

    John Kerley

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

  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

  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

  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

  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 😀

  63. July 26, 2014 at 7:34 am


    Useful tutorial on how to use the LM317 voltage regulator

  64. July 29, 2014 at 12:45 pm


    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?

  65. July 31, 2014 at 2:37 pm


    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

  66. August 9, 2014 at 12:38 pm

    Krisztián Szirtes

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

  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?

  68. August 20, 2014 at 11:48 am

    José Ramón Bracamonte

    Thanks dude, really helped me!

  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?

  70. September 21, 2014 at 3:02 pm


    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?

  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 ?

  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

  73. October 12, 2014 at 1:03 pm

    Gord Slater

    “Durasmell” – love it 🙂

  74. October 20, 2014 at 9:11 pm

    Stephen Jones

    Do It !

  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,

  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

  77. November 24, 2014 at 2:58 pm


    Can LM317 use to replace car alternator voltage regulator?

  78. November 30, 2014 at 10:02 am

    Kavindu Gilshan

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

  79. November 30, 2014 at 8:46 pm


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

  80. December 1, 2014 at 3:08 am


    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 .


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