Psu pc hacking11/20/2022 ![]() ![]() First, the “TL494” chip is used in almost all of them, and the TI website has loads of helpful information. Just a quick look at this image will tell you a lot about how to mod the supply. This may not be the *exact* schematic of the supply you have, but I guarantee it’s probably close. Well, it turns out that getting a schematic is as easy as Googling “ATX power supply schematic”: One thing’s for sure: you’ll come away from the experience knowing a lot more about how switching supplies are designed! However, with a schematic and a will to tinker, anything is possible. These don’t make great adjustable supplies, as the output voltages are designed to be fixed, with varying loads. ![]() So, if you’re looking for precise voltage control, use the main outputs. The other voltages are designed to track the logic voltage and aren’t regulated themselves. The other tip is that usually, only the main logic voltage (3.3 or 5) is regulated (a sample of the output voltage is fed back to the regulator chip). Sometimes there are two of these, and you can combine the transformer secondary windings in series to boost the available output voltage. The key for getting high current output is to use the 5V or 3.3V output circuit. I discovered, though, that they are all basically the same design, and once you identify the regulator chip, you can find sample applications schematics on the chip manufacturer’s website. The hard part is finding a schematic, because it’s a lot easier than spending your time tracing the PCB etches and drawing your own. If you’re careful, you can get almost the rated power out of them. I modded a PC supply to create a high current 13.8V supply for a mobile radio. ![]()
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