LM317T Variable Voltage Power Supply
Intro: 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.
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
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
14 Comments
BadD2 7 years ago
There are 3 caps on the parts list but there are 4 on the actual PCB on the last pic?
shafayetr 7 years ago
What is the output voltage
Can i use volt meter and ampmetar in output
What is the input voltage
AMIN72 7 years ago
Hello
4-20 mA current output?
How is how to connect elements?
Please guide me
BahgatH 8 years ago
its not working the 10 k potentiometer goes bom
DIshendra 8 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.
BahgatH 8 years ago
harischandraprasad 9 years ago
Glass paint as solder mask looks interesting.
dudes 10 years ago
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 10 years ago
The schematic is in the Eagle CAC file (Power Supply.rar). You can open it with the free version of Eagle.
isnacku 10 years ago
alter2000 10 years ago
DIshendra 10 years ago
i used a mix of two chemicals in ratio 2:1 H2O2 and HCl.
alter2000 10 years ago
DIshendra 10 years ago
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.
https://www.instructables.com/id/Stop-using-Ferric-...