ATX power supplies are great for spare parts, and fantastic project boxes for mains projects

Also the colorful wiring that comes with a ATX psu is a pretty useful since its a decent thickness and comes in so many colors.

From the pile the most usefull things id say are the output rectifier diodes, input bridge rectifier and the heatsink.

I found the transistors not that great for reuse because they are high voltage parts that don't perform that great for low voltage high current use. And i don't find myself using the high voltage caps that much (Or when i do i needed much bigger caps than this) and these caps almost never fail in PSUs.

As for the magnetics components yeah the transformer could certainly be reused, but will have a pretty high winding ratio. The transformer that is used for gate drive is likely more useful as those have winding ratios closer to 1 and so can be used to make low voltage isolated supplies. The chokes need to be used with care tho, some of them are made from lossy ferrite material on purpose to help them damp out noise. Those are not so good as inductors in switching supplies as they soak up some power rather than storing it as they are supposed to.

I did kept those wires too for future use. I did salvage input bridge rectifier, but didn't bother with output diode since it was in really hard place to de-solder, making it not that worth it. Not to mention i have a lot of low-voltage schottky diode laying around. They're rated only for about 5 Amps though.

But transformers were worth it , as when i tried to find products that are sold in small quantities, they were ridiculously expensive and hard to get one i like. The PSU is designed for 220/230VAC 60Hz, I think i might know what ratio is. ( If i'm correct, 220 VAC is about 310 VDC Rectified, so to get 12 volts, probably 310:12 ? )

I do agree on other parts. I did saw Transistor's pricing on part seller i use frequently and they were not -that- expensive. But since those heatsink and transistor bunch was blocking me from accessing some other components, i de-soldered them as well.

The diodes that are on the heatsink are the nice ones that handle a lot of current for making those high power output rails. Tho the double diode arrangement is not that often used, but you can just use the two diodes in parallel get more current rating out of it, And the heatsink itself is one of the most useful parts so i always keep it. Not only is it a decent sized heatsink, but it already has threaded holes put into it (tapping these small diameter threads into aluminium by hand is annoying as hell) and you even get insulating washers and pads included too. So even if the transistors are not interesting the hetasink definitely is.

As for the transformer the winding ratio will be smaller than that. I haven't measured one but the ratio is probably more like 300:25 for the 12V rail since it needs enough regulation headroom for losses that add up along the whole chain and for dips in the input voltage. The actual turns are probably not 300 turns for 300V input because you can usually get away with less turns due to the operating frequency being so high (But other factors affect the turns number too). Its easy to measure the turns ratio if you have a signal generator and oscilloscope, but with a bit of creativity the open terminal inductance can also be measured with those.

Yeah high frequency ferrite transformers are a bit harder to buy new due to how very application specific they are, but you can get some free samples of them from CoilCraft or you can buy transformer components for a reasonable price (bare ferrite core and empty bobin) and wind your own custom transformer to the exact specifications you want.

Capacitors, transistors, coils, maybe a few resistor packs and what looks like a flyback transformer. Nice haul!

Actually no resistor is in this picture. I did salvage one thermistor though.

But other than that, i have a lot of SMD Resistor either way.

Good load of power magnetics there! One of the smaller transformers looks like it has a burnt winding (above bottom right) or is that just adhesive residue? Even so, the core and bobbin are still useful ;)

It's actually adhesive residue. The windings are fine since the power supply did get power to some degree, and that's the common mode choke for 220VAC.

From what i see is that it does filtering but it also provides a bit of isolation from mains before going into fuse, and then bridge rectifier.