ATX Benchtop Power Supply Refined

500W, 12V variable, custom laser cut panels, dual panel meters for each voltage line, Arduino friendly DC jack sockets, sleek design

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I had originally set out to simply add a few terminal posts to an existing ATX PSU, however, having searched around for various tutorials, and having done much reading I decided to take it a step further, and thought it would be pretty neat to utilize as many of the features as possible.

This PSU features custom laser cut perspex front and rear panels (the only 'non standard') item in the build).

I used DC-DC converters to power the panel meters from the 12V line on a custom PCB.

A 12V variable section was added for those times when you just need to test something quickly.

I have used 2 x 60mm fans mounted in the rear panel to replace the 120mm fan that came with the original PSU as it was 2mm (yes, just 2mm) too tall to fit inside the case.

This is my first major (ish) project having tinkered with Arduinos for a few months, and not knowing much about electronics in general. I guess this was somewhat of a baptism of fire.

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zakqwy wrote 04/16/2015 at 15:42 point

Sure beats the hell out of my version! Great work!

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Mark Cambridge wrote 04/16/2015 at 16:05 point

haha, if yours fits your need then it's perfect for you! Thanks for the positivity though. The actual cost was £149 ($220) with the project cost at £127 ($187). Actual cost is higher than the project costwith having to purchase packs of items when only 1 or 2 being in the actual project. 

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Winston wrote 04/16/2015 at 15:19 point

Very cool. What model digital displays are those? Source for them? What did you use in the adjustable section? LM317 or equivalent?

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Mark Cambridge wrote 04/16/2015 at 15:37 point

hi bigbazinga, the panel meters can be found on eBay here:

Yeah the variable voltage is indeed an LM317. I have plans for a version 2 of this PSU with some nifty upgrades (including the higher current LM). I'll write the project up properly later tonight or in the morning, with schematics and more images etc.

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suicidal.banana wrote 04/16/2015 at 10:46 point

Very nice end result, id love to have that on my desk!

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Mark Cambridge wrote 04/16/2015 at 11:43 point

Many thanks for the positive comment! I will post more images of the inside soon.

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suicidal.banana wrote 04/16/2015 at 12:21 point

Cool, please do, i actually have a few ATX PSU's laying around collecting dust, and i do sorta need a benchtop powersupply, so i should prolly look into making something similar :) (though i doubt ill get it looking that fancy/professional!)

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