LM317 Adjustable Voltage Regulator complete Tutorial with Practical Experiments

In this video, I have discussed all the features of LM 317 Adjustable Voltage Regulator with different Practical Experiments, like motor speed controller, LED dimmer, variable DC power supply etc.
I will request you to watch the complete tutorial video of LM317 but you can also jump to any topic by click on the following Time Stamps:
00:26 Operating Condition of LM317 from Datasheet [voltage, current, temperature rating etc]
01:28 Explained how the LM317t circuit works with voltage equation [ use of capacitors, resistors in circuit]
02:12 Pinout of LM317t ic [Adjust pin, output pin & input pin]
03:20 How to make variable dc power supply circuit with LM317t on breadboard
04:21 LM 317 circuit analysis [ input and output voltage measurement with multimeter]
05:55 How to use LM317 as a fixed voltage regulator [LM317t as 7806]
09:33 How to calculate power dissipation in LM 317 [ When heat sink should be used with LM 317]
11:26 Protections for LM 317 circuit for different applications from LM317 datasheet
In this video, I have used LM317t which is the TO-220 type and most common type LM317 IC. With a very simple circuit, the Output voltage can be varied from 1.25V to 37V with current rating 0.01A to 1.5A
As lm317 is a linear voltage regulator so it is not so efficient but the circuit is very simple. so it is widely used in different applications like adjustable DC power supply, fan speed controller, LED dimmer etc.
By solving a simple LM317 output voltage equation you can easily use LM317 as any fixed voltage regulator of 78XX series.
It better to use a heat sink with LM317t ic for higher power dissipation.
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[@RuwanX]

Must say you've spent quite a good bit of time in preparation for this video and It gets noticed. All the clear diagrams, properly focused camera where necessary all pays off. Very informative and very well done.

[@TechStudyCell]

Thank you for your feedback.

[@giantgigante7725]

💯⚡🎥🙇

[@guadalupecuenca5009]

@@TechStudyCell gf

[@enalisemelbye9244]

Just would like to thank you, for your videos. As a entry level "love electronics" guy, I watch them with great interest. So thank you, and youtube,, for make it possible, for me to learn more about electronic. It is very important to me, to have access to tutorials like this. I have learned a lot. Jens from Denmark

[@TechStudyCell]

Thank you enalise melbye for your feedback. There are many other electronics tutorials on different topics available on our channel, Hope you will find those video helpful, let us know your feedback.

[@chandrashekharratnakarjosh8500]

Easy language made hobbiest like me, to continue learning such a difficult subject. Thanking you.

[@TechStudyCell]

+Chandrashekhar Ratnakar Joshi Thank you for the feedback..

[@muvirimig]

you have answered my question, even if you increase the input voltage, the output voltage remains the same, thanks my search is over😊

[@axedoc2010]

Excellent video! Thank you.

[@TechStudyCell]

you are welcome...

[@michaelthibault7930]

Yes, excellent -- obvious consideration for presentation of theoretical, schematic, layout, and measurement/testing aspects, all in relation to the visual 'real estate' of the chosen medium. Kudos on this formula!

[@yeasinali7599]

6

[@yeasinali7599]

axedoc2010 the

[@rahuldey2780]

Truly .. excellent video!

[@agstechnicalsupport]

Thank you for posting such an instructive video on LM 317 Adjustable Voltage Regulator.

[@TechStudyCell]

Thanks for your feedback...

[@beautifulworld1491]

Very tasty explaination.

[@mtrandom4540]

great and precise video, excellently prepared with both theoretical and practical approach

[@TechStudyCell]

Thanks for your feedback 👍

[@dman2993]

Very Helpful....thank you!

[@TechStudyCell]

you are welcome...

[@krishnaman9864]

Very clearly described thanks a lot

[@emmanuelsheshi1553]

thanks so much. very clear and precise explanation

[@TechStudyCell]

Thanks for the feedback...

[@gabrielquarshie94]

Very interesting to know these things

[@bprasadsinha9740]

IT IS VERY GOOD USE Oic 317.Pleas write full details about 1.volume contrle wire type or simple 2.resistance wattes. 3. ic 317: voltage range,current etc when any electronic circuit is shown on u tube, full specifications r to be given on ckt diagram

[@amitkanani9596]

nice video with proper description.

[@TechStudyCell]

Thanks for the feedback

[@pacerodi]

The basics, but, a very good explanation of what it is possible of doing so, by itself. But, you didn't mentioned the LM317 with a bypass transistor.

[@girish9449971]

Best video.

[@tayyabmughal2415]

Excellent

[@brahimabdelsadek5815]

thanx very much.keep going man

[@tanchewcharn3882]

Nice Demonstration.

[@TechStudyCell]

Thanks...

[@abeditani8293]

excellent. yes it is exactly as you describe the electronic material ( 10K VR \ 220 R \ 10 muF C 50v \ i use 1muf in the input 50V \ and LM317T .

[@TechStudyCell]

Thanks for your feedback.

[@muhammadrafiqulislamkhan6994]

Your home work was good . thank you.

[@TechStudyCell]

You are welcome

[@Omni-Kriss]

Thank you for making this video!

[@alibulhasan3935]

Sir you are a Good teacher, thanks

[@TechStudyCell]

Thanks for your feedback...

[@billybonewhacker]

Great job and your English is better than most.. 👌

[@TechStudyCell]

Thanks, I try my best to make quality content.

[@alikaampo9370]

Thank, I tried it worked but I didn't use capacitors though I didn't understand what are they here for, the calculation is of fixed voltage it's bit missing if you can explain please. Many thanks.

[@alikaampo9370]

Seriously your theory and practice are straightforward clear. Many thanks.

[@kennmossman8701]

re the caps do read the datasheet

[@vensmurali2330]

super............

[@debashisroy8265]

GOOD TO UNDERSTAND AND EASY TO IMPLEMENT

[@TechStudyCell]

Thanks for the feedback

[@ningdeloy6342]

nice video sir thanks,

[@TechStudyCell]

You are welcome.

[@alikaampo9370]

Hi, it very helpful video once I tried with 2 multimeter to measure with Vcc=13v input the output of 7v (1.25×(1+1k¤ ohm/220 ohms) =6.83v. Therefore the answer 7v from input and 3v from output as I know 3v is dropouts. My question is there connection problem? I was expecting to get 13v input and 6.93v output permanent. Many thanks.

[@richardhamm2535]

Great job!

[@TechStudyCell]

Thanks

[@thegreatttc8627]

Excelent!

[@TechStudyCell]

Thanks

[@shankaranseshan3263]

Very good description. Request for some Audio amplifier ckts with explanation. Thanks.

[@TechStudyCell]

Ok

[@SaranyaSaranya-uj3um]

Very useful video.. can u plzzzzz tell me 1 school level project related to health or cleaning

[@ModifywithManoj]

Nice video and informative. Can we use small size potentiometer, since I want to make one circuit by adjusting the voltage and seal inside shrink tube.

[@TechStudyCell]

Yes. but you have to use a heat sink if the temperature increases above the specified limit.

[@abriwin]

best video I have seen on the subject to date, explained everything clearly, show the circuit layout as well as what it looks like on a bread board, great, however I got a bit confused when you used a similar circuit to create a fixed voltage. Anyhow mmust try to build it now using an old 30v computer supply although I should really use a 12v supply like you did. What would be the calculation if I still only wanted 3v to 12 v using the 30v supply or could I continue to use the same values as you did?

[@TechStudyCell]

Thank you for your feedback...

[@amitghosh6966]

A larger heatsink will be needed I think as when you use 3 volt at 1 Ampere current suppose a large voltage drop will be there and so lot of heat in Ic so large heatsink. But I don't know how to calculate correct heatsink size

[@vicjames2743]

VERY good video... Thank you sir...

[@AjayGupta-vu9nx]

very good explanation.

[@TechStudyCell]

Thanks for the feedback

[@dilkashaikh]

Hi Sir, VEry helpful BUt I would suggest that give the referenece book in pdf formate of every lectures Thank u :)

[@TheSummersilk]

Just google for data-sheet.

[@aigleblanc3966]

Yes YES oki vous êtes tous des tricheurs dans ce domaines hi !!!!!!

[@dazai7669]

I have 100k variable resistor what changes do I make in the following circuit? Excellent video BTW

[@YNGBLD80]

Hi very detailed explanation, my question if the pot is connected to ground (i see you have connected ground to the wiper), how does the current flow through both resistors wouldn't the adjust pin just ground i dont understand how the current flows from Vin through both resistors then back out to Vout, where am i losing my thought process :( ?

[@glennkrieger]

Great job dude!!

[@TechStudyCell]

Thanks

[@smart_programmer]

nice video Tech StudyCell. Can i know the limitation input voltage for this LM317? is it when i consume voltage up to 40V, the output voltage can remain constant at 12v for 8 hours operation? I think the regulator will blow right?

[@TechStudyCell]

Thank you for your feedback. input voltage can be maximum 40volt [TO 220 type] You have to calculate total power dissipation in LM317 as I have discussed in the video. you have not mentioned the ampere value in your question. If power dissipation is high then use a proper heat sink, it will work fine.

[@smart_programmer]

Thank you for your response and your awesome video.

[@williamguillen4113]

Tech StudyCell The LM317 have no maximun voltage, is floating regulator . 40 volts is the maximun input-output differencial voltage. The máximun power dissipation is 20 watts, after that the protection circuit shut down the regulator.

[@radharamanan5003]

very nice

[@TechStudyCell]

thanks

[@DennisMurphey]

i like that you diagrammed the circuit physically mapping to the actual pin outs. But i have a problem. I want to regulate a heater that creates smoke by boiling oil in my Model Train. Steam Engine. I have built this circuit and tested many times. It only works correctly if i put the NTC thermistor as the R1 variable value with the R2 as a fixed Resistance. As the heater increases past 140C i need to reduce Voltage to lower heat to prevent over heating. I can never get the NTC as the R2 to lower Voltage as it lowers Resistance, is that right?

[@UnauthorisedService]

first class tutorial .. thankyou !

[@TechStudyCell]

You are welcome 😊

[@shahabuddin8893]

Good

[@vinodnadoni5047]

Sir , instead of connecting LM317 & resistors to input, can we connect a potentiometer directly to a input right? Will it work to get adjustable output voltage?

[@satishsanhotra4391]

Like and subscribed. Great way of giving information

[@TechStudyCell]

Thanks for your support :-)

[@satishsanhotra4391]

@@TechStudyCell can we extend this circuit and also add ampere regulation?

[@satishsanhotra4391]

Hi. I make same circuit but unable to adjust the voltage. Please help

[@melplishka5978]

Nice job , well done. Ty.

[@TechStudyCell]

Thanks

[@amantechnicalgyan]

Very good explain

[@TechStudyCell]

Thanks

[@alikaampo9370]

Thanks for your tutorial, where 4.8 value came from. While the output voltage is 6? Thank you.

[@emmettlewis8293]

Very helpful. Thanks

[@TechStudyCell]

Welcome

[@farooqalikhan7126]

Very excellent explanation can you upload 12volt auto cut off battery charger

[@TechStudyCell]

Ok and Thanks for the feedback.

[@juliusvalentinas]

Any way to control the LM338 Constant Current Regulator Circuit digitally using arduino?

[@bioeswaran01]

I like this videos

[@TechStudyCell]

Thank you...

[@haxxy40]

Finally, a good Indian youtube channel. Subscribed!

[@TechStudyCell]

Thanks for your support.😀

[@falsehood3314]

Very well Explained, thanks bro

[@TechStudyCell]

Welcome

[@mujahidbadarpura3100]

Sir it is was an excellent video and that much mirror concept u used,the way of used equation mind blowng.any source for finding data sheet like this lm317 of any component?

[@markschuurman4000]

Try googling 'datasheet lm317' and you'll find tons of datasheets.

[@gabrielquarshie94]

Super....

[@TechStudyCell]

Thanks

[@BikeFinancePoint]

Sir can we use 1uf capacitor at output??

[@abeditani8293]

and you can add 2 diode silicon in serial. they can eat 1.4v up to 1.8v during the current increases. and by that you get output from 0 to 35V

[@informalgaming2576]

Can you explain to me what each component serves to do in this schematic?

[@demodelbouwloods987]

Great video but still have one question, does the resistor R1 also make the lm317 react to a voltage drop on the output side because of heavy load. For example, if the output voltage is set to 10V with one motor connected to the output. If you suddenly connect a second motor in parallel with the first motor, wil the circuit respond to the voltage drop and and still be regulating to 10 volt? My goal is to run an modeltrain (electric motor) at a desired speed and switch other trains (motors) on the same layout on and off without changing the speed of the first train. With regular power supply deliverd with trainsets you see the voltage drop if you add a extra train on the track and the trains slow down. Thank you in advance.

[@kennmossman8701]

wil the circuit respond to the voltage drop and and still be regulating to 10 volt? YES

[@dazai7669]

i have a 24 volt 1 amp powersupply and a 50 k pot what changes should i make i want to power 40 8mm white leds thx

[@daisym6503]

Hi, I made it on the breadboard for the test. It works fine. After soldering, the output voltage remains the same. (Ex: input 12v, output 11v). Could you please help me? Thank you.

[@TechStudyCell]

Check for any losses connection or wrong polarity. You can refer the blog for the circuit. easyelectronicsproject.com/mini-projects/lm317-voltage-regulator-circuit-1/

[@zeetech2024]

Another superb video... Could you guide me or make a video on how to get 24V 8amps OUTPUT from a 12V Car Battery?

[@TechStudyCell]

you can a boost converter

[@zeetech2024]

​@@TechStudyCell I am confuse about these Converters because there are many Boost Converter but mostly are 5/6Amps ones and require 28/30V input for a 24V Output, can you suggest me one which would work with 12V input?

[@srikanta_maharana]

Brother please say the uses of the voltage ragulation

[@muvirimig]

thanks

[@petrdefeld4501]

Thanks for the video. I need to advise what to do when the LED output 130V for a while, it will flash the image with the logo but it will go out and the Volt output will drop to 58V, the Required 130V will not hold me. Please, give me an advice.. My model 42LA620S. Thanks

[@TechStudyCell]

Sorry. your question is not clear...

[@lydiakmetikova6995]

O K Je to fajn.

[@khatridigitalelectronic6595]

Hy I make this type circuit Using verible resistance are 10 k, 1k resistance connect with vout and adj, then I give 19 voltage input and out put found max voltage is 13.89.. What I do output voltage near 17 to 18 v

[@mobinahmed1975]

Make step up buck booster module. It far better than old one.

[@tommyfournier7028]

Where did you get the datasheet with section directory...?

[@dhruvpalia2876]

Sir can I use this same circuit for my jhonson motor and input is 12v, actually I want speed control for 4 motors simultaneously,single controller for 4 motors.....can I use this same circuit??

[@charipvr]

can u pl explain the dif type of led with working voltage, amps wattage.

[@TechStudyCell]

I am planning to make a video on LED, where I will discuss those point in details. Thank you.

[@brycejcox]

Great vid but I didn’t understand one part. At 1:41 you said using the 2 caps was optional but using them would do what exactly?

[@TechStudyCell]

Thanks, If you connect the caps then it will eliminate the AC ripple so you will get constant DC voltage at the output. I said optional as if you don't use those caps still the circuit will works. But it better to use caps to increase the stability.

[@brycejcox]

Thank you! Completely makes sense now. Sorry for the rookie question, never had any formal electrical education, just trying to learn what I can online as i find it interesting.

[@Ravikumar-pd7lr]

Happy day

[@joao5769]

to 3.3 vols? . muito agradecido

[@amitghosh6966]

How much should be voltage and Ampere of transformer if we want to use this Ic for 1.2 to 18 Volt , 1 Ampere current and what should be size of heatsink for this as it gets very hot ?

[@kennmossman8701]

GOOD question that is all to o often not covered perhaps because it is rather complex. If you are using a bridge rectifier as a full wave rectifier then the transfomer should be at least 1.4 times the desired output current. In your case rated at at least 1.5A I forget the channel but there is a very good video on HS. For 1.2V yould need a MASSIVE HS. I would have a swtch to select say 1.2 to 8V or 9V to 18V with a pre-regulator for the lower range to spread the heat dissipation

[@abeditani8293]

in the output . 2 in serial . in the positive output pin

[@costa29554]

Hi Sir, if i want to get fixed output voltage of 24volt which resistance should I be using lm317 for my amplifier what would u suggest

[@abhishekkumar-mm6bt]

Mene input 18v liya hai resistor value ? Out put is 13.5

[@blackburnmichelson6189]

hey i need more amps 20 or 15 a

[@JBattler]

What is NOT complete about this tutorial is the 1.25 in the formula...where does that come from?? How does the Adjust terminal work - a need to know to figure out values I would think...otherwise it seems to be trial and error. so,...not "complete", but pretty good for what it is.

[@mmzhr]

indians are clever peopls 👌👌👌

[@manishrajput7309]

What will we do if we require fi 1amp currently . Please reply me asap

[@TechStudyCell]

The circuit can handle up to 1.5 Amps. It's better to use a heatsink with the IC and if the difference between input and output voltage more the circuit is inefficient.

[@panchalTechnicalguru]

मेरे पास एक सोलर प्लेट है जिससे 10volt 0.15 amp. निकल रहे हैं और मुझको मोबाइल चार्ज करने के लिए 5 बोल्ट 1 एंपियर चाहिए कृपया मुझे बताएं यह कैसे होगा

[@frostknight7659]

can i know how can i get a output range between 5 v to 15 v ? please reply me i need help for my project T.T

[@frostknight7659]

can i initially put a fixed output voltage like 5v, after that i add a potentiometer to adjust my voltage to maximum 15v ?

[@haravindaravind6029]

How to regulate the 230v to 50v to 60v can u help me fr ths

[@TechStudyCell]

try switch mode power supply

[@Mrprabhakar6584]

What would be it's price sir ?

[@TechStudyCell]

Rs 18 to 24/ in India.

[@dennismcintosh1816]

Need help on how can I generator 5 v output from 8mV input

[@kennmossman8701]

8 milli-Volts???? if its 8V use a 7805

[@melplishka5978]

How can you make a variable voltage and currrant supply ?.

[@kennmossman8701]

currants are sometrhing you eat it would be a current LIMITER and NOT a regulator

[@cristiancristir1]

you need a big capacitor at the input. at least 4700 u.

[@TechStudyCell]

If the input voltage is fluctuating then you should use high capacitance before LM317. here I have used a stable DC input so I have not used such capacitor.

[@abeditani8293]

USE 1n5400 (DO-27) Axial 3 Amp 50V or 1n5401 (DO-27) Axial 3 Amp 100V

[@chatiq7863]

sir mujhy ap ki help chahiya mujy lm317 voltage regulator bnaty howy taqreebaan 1 year ho gya ha lakin har bar main fail ho jata ho please ap mujhy thora sa guaid kr dain

[@jansterenborg]

How to come from 25 to 30 volt to 19 volt?

[@kayesbinyousuf1157]

If I use two 100 uf,25V capacitor(both in i/p and output side),i/p voltage 18 V and 100k potentiometer,220 ohm resistance.. then the circuit will work or not?

[@shilpimondol4009]

Can I use 3A transformer

[@TechStudyCell]

You can use 3A transformer but the max current limit of the circuit is 1.5 A. So current should not be more than 1.5A. please refer the datasheet

[@shilpimondol4009]

How to do that

[@shilpimondol4009]

Please please please......... tell me

[@Electromechanic1993]

Can I use 24v on the input???

[@TechStudyCell]

Yes.. but use heat sink

[@Electromechanic1993]

@@TechStudyCell I mean 24v transformer

[@TechStudyCell]

24dc.. use bridge rectifier to convert Ac to DC.

[@Electromechanic1993]

@@TechStudyCell yes that's for sure thank you