MultiSupply: For my Little ElexLab

Simple LM317 based Power Supply with: +12V, +9V, +5V, +3.3V DC output

Amar Potdar

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Description

Just a stupid idea. But Very handy for small testing and sort-of works.

Simple Power supply :
- Low Cost.
- Easy to Build.
- Easy to Use.
- Easy to Troubleshoot.

Details

My little lab needed little power supply. For testing and simple powering purpose. Main goal here is

Should be extremely low cost.

Should be Single layer, for DIY PCB Etchers.

Should use components, which are easily available.

Should be,
- Easy-to-Assemble
- Easy-to-Test
- Easy-To-Troubleshoot.

Circuit designed around:

LM317 Adjustable regulator. With Heat-sinks.

DC Socket at Input.
Low cost SMD 1206 Rs & Cs.
LED for POWER Indication.
Terminal Blocks for each Output.
Bonus USB-A-Female Connector [+5V],

Design Files are licensed under the CERN OHL v. 1.2.

You may redistribute and modify this documentation under the terms of the
CERN OHL v.1.2. (http://ohwr.org/cernohl). This documentation is distributed
WITHOUT ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING OF
MERCHANTABILITY, SATISFACTORY QUALITY AND FITNESS FOR A
PARTICULA.

Files

DipTrace PCB - MultiSupply_bot.pdf Adobe Portable Document Format - 19.75 kB - 03/20/2016 at 20:14		Preview

DipTrace PCB - MultiSupply_top.pdf Adobe Portable Document Format - 18.42 kB - 03/20/2016 at 20:14		Preview

multisupply BOM.csv ms-excel - 433.00 bytes - 03/20/2016 at 20:09		Download

Components

1 × LM317 Power Management ICs / Linear Voltage Regulators and LDOs
1 × Resistors SMD 1206
1 × Capacitors SMD 1206
1 × Electrolytic Capacitors
1 × USB Connector

View all 8 components

Project Logs

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PCB Design
Amar Potdar • 03/20/2016 at 20:30 • 0 comments

Well, As stated earlier, My goal is to design board such a that any DIY PCB etcher can do.
So, I gave special preference to net classes, by making all of them to 1 mm. [thicker traces are best in Iron based toner-transfer method]
I choose DipTrace PCB tool to design the board, It's really an easy tool to work with.
Speaking of placement, I followed K.I.S.S.[Keep it Smart & Simple] rule, and tried well for it.
Placement:
Routing:
Circuit Design
Amar Potdar • 03/20/2016 at 20:20 • 0 comments

LM317 being widely used regulator. It's circuit is straight forward and proven. It didn't take much time to put all the pieces together. And within no time I was ready with Schema.
5mm LEDs at the output end of each LM317, to indicate the ON/working status.