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Registered Member #314
Joined: Mon Mar 13 2006, 03:12AM
Location:
Posts: 52
Well i was originally going to mod an ATX power supply for a benchtop one. I need a power supply to run the PIC microcontrollers which require 5 volts. But after talking with some guys in the High voltage chatroom i decided to use the power supply for coilgun parts. So i went on a quest for a cheap variable power supply. I finally decided on the 0-12 volt one from Chaney electronics. It was small, and reliable. ( here are some pics of the build. you can get an idea of what the finished thing looks like so i dind't include a final pic. I had a problem with the fan though, it was a 12 volt fan and i tied the power leads to the binding posts for the output. only problem was that at around 5 volts it would start to draw power. and would make the output voltage oscilate from 5 to 4.3 volts. If that happened while working ona pic the Pic would brownout every time the voltage dropped below 5 volts. so i had to add a switch to turn off the fan while working on PIC microcontroller. I'm not too worried about overheating the power transistor at 5 volts, but it starts to get hot at around 8 volts.
mockup of holes, left to right: switch, LED, last 2 are for potentometer mockup of parts makeshift vent ghetto fabulous way of makeing a large hole :) soldering the connections
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
My psu started out as a bunch of transformers on a piece of fiber-board when I was 16. It has evolved a lot over the years, and even sports 4 continuous readouts!
It still has one last generation yet to come. An improvement which will let me pull a lot more current then I can now.
The present supply is pretty expensive and packed with electronics everywhere. The next one I will probably have to have a toroid made for it because I need a specific VA and lots of taps.
Registered Member #314
Joined: Mon Mar 13 2006, 03:12AM
Location:
Posts: 52
Hmm, i guess i could do that. but i wanted to put those A/D converters i have to good use. I just gatta scavenge some 7 segment LED displays and i should be able to make one. I also need to change the fan thats on the power supply, it draws too much current, not to mention it has toner caked on it so whenever i touch it i get toner all over my hands.
Geometrically Frustrated Registered Member #6
Joined: Thu Feb 02 2006, 04:18AM
Location: Bowdoin, Maine
Posts: 373
Sounds like a neat project, but I've got two things to point out: 1) The images on your page don't load. 2) From the Project Board rules: Be thorough. A link to a website isn't appropriate, neither is a short paragraph. When possible, include images and other media.
Registered Member #314
Joined: Mon Mar 13 2006, 03:12AM
Location:
Posts: 52
Oh, sorry, i dind't read the rules . I'll try to fix the pictures and i'll be more thorough next time. . but where would we have a conversation about the project?
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Variable power supply
. I'll try to fix the pictures and i'll be more thorough next time. 
. but where would we have a conversation about the project?