DIY Bench Power Supply Question

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  • Hachune
    Member
    • Sep 2022
    • 10
    • IN
    #1

    DIY Bench Power Supply Question

    Hi,
    I really need a bench power supply for finding shorts. I am a hobbyist and never had one before, I still plan to buy one in the future but will this setup work for the time being?



    1. ATX PSU - I have multiple of them lying around (albeit old stuff), I believe they can provide pretty high amps on 12v rail.
    2. Buck converter with variable voltage and amp control with a volt/amp meter. Link to the product : https://robu.in/product/5a-cnc-dc-dc...supply-module/
    3. A multimeter probe at the output.

    I plan to desolder all other voltage wires except +12v, a ground wire and PSON (green wire). But I have no idea if it will work as intended. I have no other plans of usage except for finding shorts in a mostly a PC motherboard and graphics card.

    Please help me out. Thanks.
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    • harp
      Badcaps Veteran
      • Jun 2022
      • 596
      • Planet Earth
      #2
      Re: DIY Bench Power Supply Question

      The ATX PSU for most short finding is overkill.
      I use the common small wall adapter 12v/1A with similar module setup, current limit, v addjust and display...

      But, it nice to have proper linear bench psu

      BTW, what is your prefered plan/method to find shorts component?
      Last edited by harp; 02-23-2023, 06:49 PM.

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        • sam_sam_sam
          Badcaps Legend
          • Jul 2011
          • 6030
          • USA
          #3
          Re: DIY Bench Power Supply Question

          My preference is to use the 3.3 volt rail and maybe the 5 volt rail and use a lm317 in the current mode you could even use the 12 volt rail but only after you determine whether or not you actually have a short

          But if go with a lm317 regular in the current mode please use a good size heat sink for this application

          Or you use something like a buck converter for this

          https://www.ebay.com/itm/224143044400

          If use this type of buck converter please make sure that you can turn the current all way down to about 50 milliamperes or so “0” milliamperes some of these boards are not going to work properly

          Case in point I bought 5 of them and one of them the current section did not work correctly but the meter section did it was a good thing that I had bought 5 more of them but without the meter

          If you decide to go with this idea do yourself a favor and replace the pot controls with something that can stand to be moved up and down repeatedly because the pot controls that are on there are not meant to be used that way
          Last edited by sam_sam_sam; 02-23-2023, 08:35 PM.

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