/diy/ - Do It Yourself

>>2792398
>>2792338
>>2792280
update on this, the ground pin was not connected between the external inputs board and the main board of the PSU (see pic), so I did not bother adding the diodes. I would have needed to measure if there was any difference between the main board and the sub board, but I don't want to do that on a live circuit that is also powering my PC. Now the fan is hooked up directly to the external input and nothing else, and will not even spin up without external input.

one problem that still persists is that the rpm pin does not show anything. I remember there being some resistors on that line which may have affected it, I'll have to inspect and clean that up. would be nice to get that working.

PSU has been going for half an hour so far and did not burn down, so I'm guessing I did not fuck it up. I also had to change the non-standard 135mm fan to a standard 120mm one, but the 3d printed spacer added so much extra height that the fan is not pushing on the transformer, hopefully it won't cause a problem (fan has a tiny magnet in the middle too). I could remove the fan grill and then it would fit but I want to keep that for safety.
up side is that the replacement 120mm fan can spin up at a lower voltage and runs quieter at low rpms (noctua s12b vs no-name nr135l).