Re: Bought this (Modern) hardware today

Posted on 2022-02-21, 20:58

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by wiretap

in Milliways

in Milliways

Grabbed a Gigabyte G1.Assassin 2 this morning. I still feel it is modern, even at roughly 10 years old. Filename Screenshot_20220221-112715~2.png File size 1.07 MiB Views 1287 views

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Re: AT pico psu.

Posted on 2022-02-21, 18:55

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

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 …

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Re: FD-505 drive 5.25 not recognized

Posted on 2022-02-21, 18:33

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here's mine. Looks completely different though. Filename PXL_20220221_182949947.jpg File size 1.28 MiB Views 1137 views Filename PXL_20220221_182854983.jpg File size 1.09 MiB Views 1137 views Filename PXL_20220221_182814236.jpg File size 1.17 MiB Views 1137 views

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Re: AT pico psu.

Posted on 2022-02-21, 18:12

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I ordered some PCB's and parts this morning, so I will be able to test it when they arrive.

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Re: AT pico psu.

Posted on 2022-02-21, 13:40

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

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 …

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Re: AT pico psu.

Posted on 2022-02-21, 03:09

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yea, don't buy the Chinese knockoff Pico PSU's. The real PicoPSU can output roughly the same amount of amps on both the 12V and 5V rails. They obviously shouldn't be used in late AT systems, but rather for Pentium MMX and prior AT or SBC systems.

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Re: Found my Viper 770 Ultra! But there's a problem.

Posted on 2022-02-21, 01:24

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just found the datasheet for that series tantalum. It is a 10V/220uF. Just need to measure it to get the case size, then you can order a replacement. https://www.mouser.com/datasheet/2/40/TPS-2066671.pdf

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Re: Found my Viper 770 Ultra! But there's a problem.

Posted on 2022-02-21, 00:41

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like a 16V 220uF tantalum capacitor. If the leg or trace isn't ripped off, you can just solder it back down. As for the other part completely broken off, it is a decoupling capacitor, likely the same as the others between the ends of the vram. You can take one off the other spot to measure it …

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Re: AT pico psu.

Posted on 2022-02-21, 00:25

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

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 …

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Re: AT pico psu.

Posted on 2022-02-20, 22:33

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

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 …

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Re: AT pico psu.

Posted on 2022-02-20, 21:45

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

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/ …

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Re: AT pico psu.

Posted on 2022-02-20, 21:02

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

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 …

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Re: AT pico psu.

Posted on 2022-02-20, 20:55

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

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 ( …

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Re: AT pico psu.

Posted on 2022-02-20, 20:31

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

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 ( …

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Re: AT pico psu.

Posted on 2022-02-20, 20:01

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

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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Re: AT pico psu.

Posted on 2022-02-20, 19:39

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

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. Filename front-3d.png File size 61.65 KiB Views 3967 views Filename back-3d.png File size 73.11 KiB Views 3967 views

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Re: Please Identify this AT-case: need drive mounting rails for this special AT case

Posted on 2022-02-13, 13:37

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Once you make something that fits, draw it out with all the correct dimensions. There are tons of companies online that can waterjet/laser cut your design out of metal. I've used this company before for metal keyboard plates, and they're reasonably priced. https://www.bigbluesaw.com/ edit: they're …

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Re: Is this a good deal? (find used/new parts online, ask opinion before buy - The Thread)

Posted on 2022-02-13, 13:30

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Seems like an ok deal, if it works. Just be aware that posting stuff before you buy is a good way for lurkers to snipe a good deal from you..

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Re: Is there such a thing as a usb-to-serial mouse converter?

Posted on 2022-02-13, 11:27

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

(PCB factories do NOT make these at cheap prices for small quantities). You're right, $7 is pretty expensive for a production run of five 4-layer PCBs. Surely out of my reach. https://i.imgur.com/E7yHCUU.png $7 is a "special price" it says. That's just to sucker you in to using their service. Most …

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Re: Please Identify this AT-case: need drive mounting rails for this special AT case

Posted on 2022-02-12, 10:04

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by wiretap

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks easy enough to mock up a design using sheet metal. Cut out thin sheet metal with some nibblers to the size and shape it needs to be, bent over with the ears to secure it to the front. Then put it in Sketchup or another CAD software to account for the thickness it needs to be and have some …

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