Instructables
Picture of ATX power supply to benchtop power supply
i would like to start off by saying this is my very first instructable.
This projects was started by me looking for something to do with an old computer i have that is out dated and virtual useless. I saw a few PSU (power supply unit) to bench top power supplies on youtube and decided that this was a good idea.
Planned Uses:
A source of power i may need for future projects the deeper i get into electronic prototyping/engineering/fiddling
a gift for my Dad to replace his older louder bench top supply



*I claim no responcibility for personal property damage or damage of ones person by following this instructable*
Tools Needed:
Screw Driver(Philips), Dremel with abrasion grinding disk, Metal File,Wire Strippers, Soldering iron+solder and stand, EYE PROTECTION

This power supply will have 3.3v,5v,12v,-12v,& Ground, with a well placed illuminated power switch.
Bill Of Materials:Working PSU, 5 banana jack binding posts($3.19 per pair of 2), (optional test/jumper leads $7.49 for a 6 pack, project enclosure 7x5x3" $8.99)
 
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Step 1:

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PSU from the ribbon cable era. i will not be going into spec. details because i feel that there is little to no need. Small differences may exist between different manufactures but for the most part all PSU's are the same

Step 2:

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open your PSU after waiting 10-15 minutes after being plugged into wall. Clean out all dust and computer nastiness

Step 3:

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I apologize for skipping a step but. Grind out hole with Dremel for switch. Place switch into hole

Step 4:

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Grind out spaces for banana plug posts. You do not need to use ventilation grate for mounting for components. This is the only place where i had room internal to mount and wire everything.

Step 5:

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Grind out as many holes as needed. i had planned for a sixth post but i didn't have enough space (six holes, only five posts)

Step 7:

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Cut off all pin connectors. in this project i only used wires from the 24 pin connector but if u wanted or needed more binding posts all wires are usable for their ratings.
Gelfling61 year ago
One minor suggestion, if the fan is facing to push air into the supply, it should have enough room (& wire) to reverse to draw air OUT (through) the supply case.. I ran across this quite awhile back, even with an old computer I had, which someone made an add-on cooling fan, but it forced air into the case, keeping it warm.. (Less points to escape from).. But, reversing the flow to draw the air out, the machine ran cooler.
gman1881 (author)  Gelfling611 months ago
that actually makes a ton of sense. may have to crack that bad boy open
i c wat he means by sloppy work man ship
or use a step drill to make correct sized hole?
Welcome here!
Good project, good descriptions, look forward to seeing more form you!
gman1881 (author)  arkangel19751 year ago
Thanks! Plan on making a whole lot more for my hobbies. Stay tuned!
pfred21 year ago
What kind of noise does your dad's old power supply make? Like what is making the noise? If it is a fan you can usually quiet those up with some oil. Look under the center hub sticker of the blades for where to access the axle that needs some lubrication.

How come all of your pictures are mirrored? I almost thought you wrapped the wires around your banana jacks the wrong way. I still think you need to get all of your stranded wire under those jack lugs. Try twisting the wire and tinning it lightly with some solder to hold the strands together for you. For that to work good though you have to twist the wire neatly, not put too much solder on it, and bend the end in a hook that goes around the stud.
gman1881 (author)  pfred21 year ago
The old power supplies noise is probably just the fan now that u say that. I did take your advice with soldering the wire tips knowing they are just kind of sloppily in there was starting to bug me. With future instructables I plan on mirroring them to be correct (for perspective) but I didn't realize until u made the comment. Thank you for the constructive comment :)