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Posts Tagged ‘supply’

Power Supply – Case Completion

November 26, 2010 13 comments


I’ve finished most of the construction and i decided that this project has taken longer than i’d hoped. I wanted to finish it so here is the final build and assembly in one huge post.

Parts Used:

  • My Adjustable Voltage Circuit
  • My Panel Meter Circuit
  • My Aluminium Supply Case (Labelled)
  • 2x DPDT switch
  • Green Binding Post
  • 4x Red Binding Post
  • 4x Black Binding Post
  • 3mm Red LED
  • 6x 3mm Green LED
  • 7x 3mm LED panel clips
  • 4P2T rotary switch
  • Amp Panel Meter
  • Voltage Panel Meter
  • Red Multimeter Lead
  • 2x 6mm knobs
  • ~20cm of 3mm 3:1 Heatshrink
  • 2x TO-220 heasinks
  • ~50 Crimp terminals
  • Lead Free Solder
  • 3x 47 KΩ resistors
  • 3x 5.6 KΩ resistors
  • 3.9 KΩ resistor
  • 820 Ω resistor
  • 12 KΩ resistor
  • 1.8 KΩ resistor

Tools Used:

  • Soldering Iron
  • Crimping tool
  • Snipe nosed pliers
  • Wire cutters
  • Glue Gun
  • Phillips screwdriver
  • 2mm Allen key

For most of this it should be clear how it goes together. The circuit construction just followed my power supply schematic. If there is anything that needs explaining further then feel free to ask. Unfortunately i got a bit carried away at some parts and forgot to take photos, I’m still learning to take my time.

Read more…

Bench Power Supply Schematic

September 14, 2010 1 comment

Note: There is an updated version of this schematic here

I’ve been unable to get to the tools lately to finish off the bench power supply case, so thought i would do an update for people looking to do a similar project.

I’ve drawn up the circuit schematic for the bench power supply. I’ve given colour coded labels for the cables coming from the ATX power supply (correct according to wikipedia at time of publication) and shown all the circuits that are needed, including all component values that I’ve so far decided on. The resistors attached to the LEDs will be chosen at  later date, hence those have no values in this schematic.

I hope you find it useful

edit: I should add that i have some planned upgrades to this, such as relays to switch the binding post outputs based on the state of the power good line. This should protect any equipment from unstable voltages when the supply is first turned on. Also I would like to put resettable fuses in line with the outputs to prevent over loading any of the components. These are complications that can wait though. For now i just want to get the basics working.

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