Bench Power Supply / Voltage Regulator

Bench Power Supply / Voltage Regulator

Adjustable bench supply / linear voltage regulator based on the LM317T IC. Circuit design is based on the datasheet example.

The supply is intended to be used with low power projects but is capable of supplying a bit more current when required. I use one rail to power the microcontroller circuit and the other to supply 9V to the h-bridge of two small gear motors. I can pull upto 600mA @ 12V without the need for a fan but things get a bit hot after that.

The output voltage depends on main supply voltage. Try to keep your input voltage close to your max required output voltage since the extra is wasted as heat.

• Input: 6VDC Output (100mA load): 1,2V - 4,5V

• Input: 12VDC Output (100mA load): 1,2V - 10,4V
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  I will not grant Thingiverse any rights to my source files so please go here for the Solidworks part files
  https://github.com/KaiserSoft/3D-Printing

  Instructions

  Parts per Power Rail

  The following parts are required to build one power rail. Simply double every part for a dual rail supply.
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• 1x LM317T

• 1x 35V 100uF electrolytic capacitor
• 1x 35V 1uF electrolytic capacitor
• 1x 50V 100nF (1uF) ceramic capacitor
• 1x 220 Ohm 1/4W resistor
• 3x 1N4004 diode (two should be enough, keep across Vin and output pins)
• 1x 10K Ohm pot (adjustment very sensitive... 5K might be better)
• 1x 1K Ohm 1/4W resistor (LED)
• 1x 3mm LED
• 1x Heatsink
• 1x Silpad (between LM317T and heatsink)

• 2x female banana connectors with 4mm shaft (http://www.reichelt.de/Bananenstecker-Zwergstecker/BB-4-RT/3/index.html?ARTICLE=4896)
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  Case Assembly

  Print and use 4 x 3mm self tapping screws to secure the lid.

• Box Lower v1.STL
• Top Cover v1.STL

Category: Electronics