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Re: AT pico psu.

I ordered some PCB's and parts this morning, so I will be able to test it when they arrive. Sweet! Whatcha think total cost will be? May snag some from ya :-) or make my own. Can there be a one click link to order them like a mouser? Project. They are around $13 each to build. There isn't a place …

Re: AT pico psu.

Smaller version.. this post contains rev 0.3. Same BOM is used as in this post: Re: AT pico psu. Just note the linear voltage regulator needs to be flush clipped and then soldered so the 24-pin ATX connector sits flat. Filename front-3d.png File size 48.28 KiB Views 1292 views Filename back-3d.png …

Re: AT pico psu.

If this design works out well, I can rev it again to do that. The caps for the 7905 are already SMD, but maybe they could be a little smaller physically. They have to be tantalum per the spec sheet. I also really wanted to use the Molex board lock 24-pin connector too, but it is sold out everywhere …

Re: AT pico psu.

Just noticed one improvement that could be made with this design.. at the P8/P9 connector, the PCB is wider than it needs to be. This can cause clearance issues with some motherboards that may have something right next to the power connector. I'll issue a rev0.2 with that fixed. edit: updated the …

Re: AT pico psu.

True, I thought about that when making it, lol. It could be a little more compact, but I stuck the L7905 between the two connectors. It could also go behind the ATX connector if the leads were clipped short. Anyway, here's the project files attached. (rev0.2) Mouser BOM link: https://www.mouser.com/ …

Re: AT pico psu.

It'd be three(?) extra components, but could maybe fudge it with a suitably debounced flip-flop running off +5SB, to make an ATX case switch act as a toggle on/off? It might need to switch via a FET to short PSON to GND, or might work directly off of the flip-flip output. I don't know what the …

Re: AT pico psu.

A regular ATX case switch wouldn't work since they are momentary. The power supply would turn on and back off the second you release the power button. The momentary switch works with an ATX motherboard since the motherboard logic holds the PS-ON signal to ground unless it gets a shutdown signal ( …

Re: AT pico psu.

A regular ATX case switch wouldn't work since they are momentary. The power supply would turn on and back off the second you release the power button. The momentary switch works with an ATX motherboard since the motherboard logic holds the PS-ON signal to ground unless it gets a shutdown signal ( …

Re: AT pico psu.

A simple adapter like this should work, and it provides -5V too. Just plug into the AT motherboard, and plug the PicoPSU in on top. front-3d.png back-3d.png Exactly that, nice! Does it have a header for the soft power switch though? Since it is AT, I have PS-ON and GND trace connected, and you'd …

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