Introduction: LM317T Variable Voltage Power Supply

Picture of LM317T Variable Voltage Power Supply

After searching on internet for a nice power variable power supply based on LM317T voltage regulator i decided to design one of my own. Because i don't find a good pcb design. All the files are uploaded so you can download them. PCB is designed in Eagle Cad.



I used toner transfer method. Soldermask is made by painting the pcb with glass paint.



Parts list:
10uF, 1uF, 2200uF polarized electrolyte capacitor
220ohms, 1k both 1/4 watt resistors
LM317T Voltage regulator and heatsink
3mm led
1N4007, 1N5406 Diodes
Two pin screw terminal


BadD2 (author)2016-11-27

There are 3 caps on the parts list but there are 4 on the actual PCB on the last pic?

shafayetr (author)2016-07-02

What is the output current
What is the output voltage
Can i use volt meter and ampmetar in output
What is the input voltage

AMIN72 (author)2016-06-03

4-20 mA current output?
How is how to connect elements?
Please guide me

BahgatH (author)2015-12-26

its not working the 10 k potentiometer goes bom

DIshendra (author)BahgatH2015-12-26

Hello friend. I suggest you to check the wiring again and use a 5k potentiometer instead of 10k. However 10k pot works fine. i have used 10k pot int my construction and it is working great.

BahgatH (author)DIshendra2015-12-26

Umm , I think there is no ground in the circuit and I have tried the 5k potentiometer and its not working and my transformer is working great and thanks for the reply

harischandraprasad (author)2015-05-16

Glass paint as solder mask looks interesting.

tunanghertztein made it! (author)2014-09-07

I just finished this PSU regulator, and it's working fine. I am using it to power my other circuit, a LED strobe. Thank you for the schematic! By the way, what type of pots do you use? Linear or taper?

congo buddy you have added a new self-made tool to your kit. I have used a shaft potentiometer.

tunanghertztein made it! (author)2014-09-07

Another angle of my regulated PSU, out is 12v DC.

dudes (author)2014-04-13

perhaps i'm missing something, but what is the input and output voltage and current?

also, it would be nice to have a schematic for those of us who are unable to etch a pcb.

mikeeve (author)dudes2014-04-13

The schematic is in the Eagle CAC file (Power Supply.rar). You can open it with the free version of Eagle.

isnacku (author)2014-04-02

hi Dishendra, nice project... can you please upload the schematic. cheers

alter2000 (author)2014-03-22

but, how's the etching carried out?

DIshendra (author)alter20002014-03-22

i used a mix of two chemicals in ratio 2:1 H2O2 and HCl.

alter2000 (author)DIshendra2014-03-22

Do they have to be pure(I doubt about HCl, though) or not? Sorry for such questions, I have almost no experience whatsoever in electronics. And thanks for replying.

DIshendra (author)alter20002014-03-22

No problem bro! If you don't ask questions then you will not learn anything. Yeah it's good keep asking questions. Thankyou for viewing my instructable.

For etching kindly refer to this instructables, in fact i learned from it.

About This Instructable




Bio: Pursuing B.Sc. in Computer Science from Delhi University at SSCBS.
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