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I had few old computers that I had to recycle. Because I’m a sentimental guy (or just stingy?) I didn’t wanted to throw them out through the window so I began to collect everything that I could use later in some DIY projects.
Today I found that it would be nice to have a variable bench power supply. One could get one for twenty bucks plus shipping from eBay or if you want something fancy you could pay like one hundred bucks for something like this.
Question: is it complicated to convert an ATX power supply to a bench variable PSU?
Answer: No. I’m not an electrician nor I’m working on electronics branch, in fact I started with small projects just few months ago. With proper tools and patient this task is a breeze.
- an (old) working ATX PSU
- heat shrinking tubes (preferably different colours and sizes)
- 1 x main switch (rocker power switch 4-pins)
- 1 x load current switch (toggle switch 6-pins)
- 6 x binding posts (1 black for ground and 3/5 red for loads)
- 2 x dummy load resistor (5W 10Ω ceramic resistor)
- 2 x 330Ω resistors
- 2 x light emitting diode 5mm LED (1 red, 1 green)
- 1 x prototype paper PCB
Although I followed the video tutorial step by step I wasn’t able to succeed replicating that project. The problem was that the ATX PSU started for 1-2 seconds than stopped unexpectedly. By checking the circuit diagram from the other tutorial I made a small change in the project’s design by adapting its circuit diagram (excepting the fuses which by the way are a very good idea):
I have taken few photos so that you can see how things works: