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Bench power supply from pc's power supplyAuthor
Panagiotis Kalogeris
January 29, 2012

Hello to all...

Well in this project i will introduce you a bench power supply from pc's power supply that i made few months ago.I have a variable power supply made by me but sometimes you need to work with more than one voltage.So the pc's power supply can give us 5 voltages which are the +3.3 , +5 , +12 , -5 , -12 .These are the most common voltages that electronics work.Also pc's power supplies have great amount of amperaze which make them versatile to lot of uses.In the photos below you will see that i have added a regulator (7809) to have this voltage also to my power supply.Another intresting thing is that i have added a connector (green one)to connect the antistatic bracelet when i prototyping with microcontrollers or chips which are sensitive to static electricity.Also a fuse cable case was necessary where has been placed to the positive cable of the power supply.All the info i needed can be found here ....


Finally i would like to THANK Kam for info and his power supply donation....

Hope you like it and built one for your own.ANY COMMENTS OR IMPROVEMENTS ARE WELCOMED.





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  • At 25 July 2012, 17:40:29 user Ned wrote:   [reply @ Ned]
    • Yes I'll be sure to don my safety goggles and ear plugs before flipping the ON switch.

  • At 24 July 2012, 19:29:10 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @Ned Just keep in mind that the power you're dealing with is very high for a supply, and if you make a mistake (like a short-circuit or something similar), you'll have a small-scale big-bang :D :D :D

  • At 24 July 2012, 0:11:38 user Ned wrote:   [reply @ Ned]
    • Hi, thanks for your reply. I have several projects/uses in mind. Firstly I want a power supply for an RC brushless motor. I wanted to try making my own vacuum pump using an RC style ducted fan and a 2 or 3 stage venturi which I would blow out of glass. I also have an idea for a mini compressor. The other thing I wanted to try down the track was electrolysis (and possibly electroplating/anodizing). With electrolysis, there is a (normally fairly low) voltage at which the process will run. The speed at which the process runs is limited by the amperage - increasing the voltage tends to just heat up the electrolyte.
      I remember reading about using capacitors to smooth things out somewhere else. I'll have to research it some more. My knowledge of electronics is not the greatest - I can follow a set of plans or instructions but am not confident in coming up with my own circuitry except for the very basics. Anyhow thanks for your reply. There's some nice little projects on here. I'll hopefully get around to trying some of them. Cheers

  • At 23 July 2012, 19:40:11 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @Ned to tell you the truth, i have never connect two smps in series, so i do not have an experience on this. I also do not have an experience in SMPS design as well. i suppose though that a large set of capacitors to smooth the output would help to connect them in series.

      What are you trying to power with 1500 Watts?????? This is not a bench power supply, this is a toaster! For me, best bench power supply is made with a transformer and a linear regulator, if of course your power requirements allow that...

  • At 20 July 2012, 1:18:32 user Ned wrote:   [reply @ Ned]
    • Hi there, I am wondering whether you could help with some questions I have. I have been wanting to build a large-ish bench power supply with variable voltage adjustment rather than fixed steps. I was also wondering about connecting the outputs in series and or in parallel on both one unit, but also two separate PSU's in order to get more wattage. I have read about this being done on another forum but I've also read elsewhere that connecting switching power supplies together is not recommended. http://www.rcgroups.com/forums/showthread.php?t=1005309&page=50 (hope you dont mind the link) this guy has what appears to be 6x DPS-600 connected together. I have 2x DPS-700 (750watts ea) earmarked for my project 'if it's safe to do so'. I would really appreciate your comments. The guys on the forum I linked to do a lot of trial and error and I'm not sure they really know their stuff. I don't want to burn my hou8se down LOL

  • At 20 May 2012, 20:57:10 user Panagiotis Kalogeris wrote:   [reply @ Panagiotis Kalogeris]
    • hello Adam sorry for late reply

      1.Of course you connect the 7809 to 12 because this chip is a linear regulator which means that you need to have higher voltage than its voltage output,in order to produce 9 volts.

      2.Look closer on the second photo i've attached.You will see what i have used for isolation....Look ON the heatsink

  • At 25 April 2012, 8:47:34 user Adam wrote:   [reply @ Adam]
    • Hi Giorgos,

      I had a PS lying around just for this purpose. Thanx for pointing me in the right direction. I have 2 questions.

      1. How (and where) do you connect the 7809 ( 12V?)
      2. What chassis parts do I need (or did you use) to prevent 'm from touching Ground


  • At 12 March 2012, 16:37:31 user Ted Harrell wrote:   [reply @ Ted Harrell]
    • I was thinking about doing this, but had no idea on how to procede. Thanks for your information and helping me come a step closer to getting my project underway.

  • At 30 January 2012, 15:02:58 user Georgi Hadzhigeorgiev wrote:   [reply @ Georgi Hadzhigeorgiev]
    • Great! I shall made one of these for me too :)

  • At 29 January 2012, 17:23:58 user Panagiotis Kalogeris wrote:   [reply @ Panagiotis Kalogeris]
    • Thank you George for your good comments.Yes i agree that a step-up supply would be a nice addition to my project....Maybe when i find some time to make a "renovation" to my supply!!!! :-)

  • At 29 January 2012, 13:07:13 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • You could also add a 0-30 step-up supply (1-2A) with display. This is something that i always want to add to my bench supply, but i always forget to start. I remember this every time i miss some strange voltage...

  • At 29 January 2012, 12:48:06 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • This is the first DIY PSU that i see with connector for anti-static wrist wrap. Taking into account that you have this bad habit to grasp those poor PICs bare-handed, it is a feature that will certainly save you some money. My next PSU will have this as well. Great idea.

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