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
<p>There are 3 caps on the parts list but there are 4 on the actual PCB on the last pic?</p>
What is the output current<br>What is the output voltage<br>Can i use volt meter and ampmetar in output<br>What is the input voltage<br>
<p>Hello<br>4-20 mA current output?<br>How is how to connect elements?<br>Please guide me</p>
<p>its not working the 10 k potentiometer goes bom</p>
<p>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. </p>
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
<p>Glass paint as solder mask looks interesting.</p>
<p>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?</p>
<p>congo buddy you have added a new self-made tool to your kit. I have used a shaft potentiometer.</p>
<p>Another angle of my regulated PSU, out is 12v DC.</p>
<p>perhaps i'm missing something, but what is the input and output voltage and current?</p><p>also, it would be nice to have a schematic for those of us who are unable to etch a pcb.</p>
<p>The schematic is in the Eagle CAC file (Power Supply.rar). You can open it with the free version of Eagle.</p>
hi Dishendra, nice project... can you please upload the schematic. cheers
but, how's the etching carried out?
<p>i used a mix of two chemicals in ratio 2:1 H2O2 and HCl.</p>
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.
<p>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.</p><p>For etching kindly refer to this instructables, in fact i learned from it.</p><p><a href="https://www.instructables.com/id/Stop-using-Ferric-Chloride-etchant!--A-better-etc/" rel="nofollow">https://www.instructables.com/id/Stop-using-Ferric-...</a></p>

About This Instructable




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