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Adjustable high current ATX Lab Power supply - Test video

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Test video of my instructable over hacking a standard ATX Power supply into a high current adjustable bench supply. Please click the link to view the detailed step-by-step guide on Instructables.com http://www.instructables.com/id/Adjustable-High-Current-Lab-SMPS-Out-of-a-Standard/
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Text Comments (8)
TheJavaSync (1 year ago)
can I use atmega 328 to replace atiny45?
Stephan C (1 year ago)
Dear +Gabs'e Thank you for sharing this info. I was lucky enough to have a PSU that corresponded 100% with yours, even the component numbers. Therefore it was fairly easy to follow your instructions. I got mine to work!!!! Thank you. I would like to add current control to PSU. Do you have any ideas? I found this schematic: http://320volt.com/wp-content/uploads/2010/10/atolye-tl494-modiye-atx-smps-devre-semasi-2.jpg From this it looks as if it should be possible. I would like to improve on the non-linear scale i'm getting from the potentiometer. Do you have any suggestions? I'm using a multi-turn potentiometer that works fine on the lower end (3V) of V-out, but it becomes very course at higher V-out (20V). If we can get this right, this old PSU will become a very usefull bench power supply. Kind regards Stephan
Stephan C (1 year ago)
Dear +Gabs'e I found a schematic that helped me a bit. You probably already know this, but here it is. http://www.chirio.com/IMAGES/atx_psp_lab_schema_01_2011.gif from http://www.chirio.com/switching_power_supply_atx.htm Manipulating the LT494 is interesting. Most people (videos) use the 3.3V, 5V and 12 V as it comes out of the original PSU, or at best, uses a type of controller on the output of the PSU. Therefore i thought that controlling the TL494 directly would be interesting. Thank you for your regular feedback. I didn't get any response from any of the other people I messaged. I must say: I have quite a bit of ripple on the output (100mV @ 180hz (I dont know why it is 180hz, The PSU runs at about 33kHz, mains 50Hz)). I would like the reduce that in future. I retained the use of the TL494's internal 5v reference. PS: i'm only an electronics hobbyist and no pro. Most knowledge came from tinkering and this is by far the most challenging project to date I've attempted. Kind regards PS: you need to make more videos! PPS: May i ask. Why do you use Instructables?
Gabs'e (1 year ago)
Hi Stephan C, Nice to hear that I could help you. I already planned to add constant current, measuring the voltage drop over the shunt and feed it to the second, unused differential amplifier of the TL494. I already took the PS A part again and replaced the potentiomers, but in the meantime I made a few other Projects so the Power supply Remained behind. GreetingsGabs'e
Stephan C (1 year ago)
Very nicely done I'm going to try this!!!!
Paras Chauhan (1 year ago)
were is installation video?????
ahmed sayed (7 months ago)
Gabs'e url please
Gabs'e (1 year ago)
There is no video, but a complete step by step guide at Instructables.com

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