Single Output Variable Power Supply

This is my Single Output Variable Power Supply Project Page

 

Project

Build a Single Output Variable Power Supply with a voltage output of 1.2 Volts to 20 Volts. The front facing digital LED voltage gauge will show the voltage output which can be adjusted by the middle potentiometer knob. A fan will be added with 2 speed settings to keep the regular cool and efficient.

 

Parts & Supplies List

  • 1x White Power Cord
  • 2x SPST 5A Power Switch
  • 1x 1.5A Fuse
  • 1x Fuse Holder
  • 1x Power Transformer with 20V Output
  • 1x M4C51 5A Bridge Rectifier
  • 1x 1000uF Electrolytic Capacitor
  • 1x 3.9k Resistor
  • 1x Green LED
  • 2x .01uF Capacitor
  • LM317 TO-2 Adjustable 1.5A Regulator
  • LM317 TO-220 Adjustable 1.5A Regulator
  • 2x 240 Ohm Resistors
  • 1x 2.2K Ohm Resistor
  • 1x 1K Ohm Resistor
  • 2x 1uF Electrolytic Capacitors
  • 1x 5K Potentiometer
  • 1x Potentiometer Knob
  • 1x Black Banana Socket
  • 1x Red Banana Socket
  • Mini Voltage Gauge
  • 12V computer Colling Fan
  • 3x Heatsinks
  • Wood for Enclosure
  • Blue Paint
  • Screws
  • 18 Gauge Wire
  • Shrink tubing

 

Circuit Schematic

Revision 1.0

 

Revision 2.0

Above is my second revision of my schematic as I added in a second LM317 circuit for my Hi and Low fan speed. I also changed my fuse to 1.5A to protect my regulators in case of over current in the circuit.

 

Power Supply Front Panel Design Mockup

 

Power Supply Pictures



Demonstration Video

 

Project Updates

Aug 6, 15 – Single Output Variable Power Supply – Build Part 1
Aug 7, 15 – Single Output Variable Power Supply – Build Part 2
Aug 8, 15 – Single Output Variable Power Supply – Build Part 3
Aug 9, 15 – Single Output Variable Power Supply – Build Part 4
Aug 23, 15 – Single Output Variable Power Supply – Build Part 5
Aug 25, 15 – Single Output Variable Power Supply – Build Part 6
Sept 3, 15 – Single Output Variable Power Supply – Build Part 7
Sept 22, 15 – Single Output Variable Power Supply Demonstration Video

 

Completed Date

Project Completed On September 3, 2015

 

Link to Share bit.ly/1JD9SnG

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