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You can install your SE board in your SE/30. They‘re compatible with one another. In fact my SE/30 was originally an SE FDHD that was treated to the Apple upgrade plan in late 90.  The way the SE deals with video is way less complicated compared to the SE/30. RAM plays a big role here. I see...

I wonder how much it would cost to have brand new CRTs made... @maceffects ? https://www.thomaselectronics.com/faq/

Update: Load resistors installed and booting for the first time since the explosion. I used Mpegdec (https://macintoshgarden.org/apps/mpegdec) to benchmark the system: 040s weren't really meant for decoding mp3s... Loading the Apple System Profiler caused it to hang for a second. That being...

Mode32 has always been quite buggy for me (SE/30, 7.5.1). Maybe this had to do with the fact that the wrong version was installed when I got the machine (I haven’t reinstalled the OS, and you’re supposed to do that if you’ve got the wrong version. Also why is that necessary?). Even after the...

Indeed! I was pretty stoked to hear it wasn't dead after that last PSU explosion. And thankfully, nothing bad happened this time!  Nice! I still need to test the AC part (will do last, after the stress/endurance tests) but I might have bought enough to do a second set of AC cables (QuadrATX AC...

IT LIVES After months of hibernation, an elusive Quadra 950 emerges from its sleep. But there's still a small problem... Since most modern ATX PSUs regulate themselves based on what they see on the 12V rail, it is important to get it right. - Without the load resistors, the 12V rail was...

Sorry for the lack of updates, the last puzzle piece (the 24 pin plug) is taking A WHILE to arrive. But I should have a functioning 950 by the end of the week! Edit: Also, I just bought my first vintage LCD monitor, a Fujitsu-Siemens X17-2 from 2003. Should work with the 950's internal video...

Of course. You won’t be using more than 40W so 160 is more than enough! Take your multimeter and check on the logic board’s PSU connector if there are any direct shorts to ground (and to other rails). Don’t use continuity mode. Anything above 3-5ohms is fine but your multimeter might beep for...

Or for a mAcTX... A PicoPSU-80 (the cheapest and least powerful one in the lineup) is beefier than the original PSU used in the Q605/LC475, and no soldering is required  :)  

I haven't followed this thread as much as I should/would have wanted to so pardon my ignorance, but wouldn't it be possible to design a small daughterboard with a SOIC attiny85 and a 32.768kHz crystal?  A bit like this: If all we need is to remove the 10/33pF cap, it's not too much of a...

The high amperage ones (Mini-Fit Jr headers). The rest's fine. For example: I set the thermal spoke (select copper zones and hit E for properties) to 1.4mm on mine.  I'm definitely not that either. Just happy to help. I learned A LOT these last few months and the QuadrATX 9x0 is my first...

Small update:  - Fan controller works. - The diode on the AC board should be reversed. The relay didn't work at first until I removed it. Not a big deal though. It's only silkscreen. Just place it backwards...

The wiring diagram looks correct for the 840. I just downloaded your project files, it's looking really good for a first draft! A few comments/suggestions, nothing critical: 1/ Is there a specific reason you chose an ATX20 header over a 24 pin one? PSUs with that kind of connector are getting...

Hi there I can’t download your gerbers right now. I’ll have a look later today. But be careful with those pinouts... The Q900 and its derivatives (950, WGS95 and WGS9150) all use a 24 pin connector (not 22!) and the pinout on this site is completely off! Please double check on your PSU before...

I'm not a fuse expert, so I went with a 5A 250V 5x20 fast fuse. What do you think? https://www.arrow.com/en/products/bk-s500-5-r/eaton 

And here's a picture of the AC board. Almost finished, I have unfortunately ordered the wrong header for the monitor out plug... I'll have to solder that later. As far as the DC board is concerned, I'll test the fan controller this evening and I've already updated the footprint for the...

UPDATE: The DC board is ready! There are two small issues with it: 1/ The footprint for the Softpower transistor is a PITA. Thank Kicad for this. I should have used the 'universal' wide NPN footprint instead of the built in BC547 one...  Unless you have pro equipment (which I don't)...

Look what arrived today! Initial multimeter tests show that there are no shorts, great! I kinda regret not using a different footprint for the Softpower transistor...oh well it's just going to be a tad more complicated to solder. Dimensions and screw holes look all right too! All the...

@robbo007 Anything above 12V will be fine. 

Thanks Compgeke! And yes you are correct! On that note I think I'll just go ahead and order those boards. I've done enough quadrUPLE checks ;)