LM317T Variable Voltage Power Supply

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

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.

Step 1: MAKING THE PCB

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

Step 2: SOLDERING THE COMPONENTS

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

2 People Made This Project!

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14 Discussions

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BadD2

1 year ago

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

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shafayetr

2 years ago

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

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AMIN72

2 years ago

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

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BahgatH

2 years ago

its not working the 10 k potentiometer goes bom

2 replies
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DIshendraBahgatH

Reply 2 years ago

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.

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BahgatHDIshendra

Reply 2 years ago

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

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dudes

4 years ago on Introduction

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.

1 reply
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mikeevedudes

Reply 4 years ago on Introduction

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

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isnacku

4 years ago

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

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alter2000DIshendra

Reply 4 years ago

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.