VOGONS


First post, by stopi

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Hello! Where can I find AT power plug in Europe? I need the connector only for making AT power supply from standard ATX unit. I wasn't able to find it in my country Poland. I can see only full ATX->AT adapters but it's little expensive here.

Reply 1 of 11, by PC Hoarder Patrol

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Try searching online for the Molex crimp housing part number (link below) - you may find ir or an equivalent locally or thru eBay (far east?)

https://www.molex.com/molex/products/part-det … ings/0903311003

Reply 4 of 11, by ahyeadude

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I recommend buying a converter that also supplies the -5V that ATX does not supply. I believe it was used by certain ISA cards. Also, one with a dummy load on the 3.3V rail since AT doesn't use it. Leaving it floating could cause stability issues in the ATX power supply.

ATX to AT adapters, which one do I need and why?

Reply 6 of 11, by SETBLASTER

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i bought the -5v version on ebay like 3 years ago
I wish i bought more, but only got 1, i cant find those anymore

the difference is just a couple cables that are connected to a white plastic square and another round component, that in terms of electronics i have no idea of what its name is.

Last edited by SETBLASTER on 2020-06-30, 20:58. Edited 1 time in total.

Reply 7 of 11, by SETBLASTER

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this is the one i bought
in case you want to modify one of the non -5v available even on china sites like aliexpress.

but i dont know what are these 2 components, maybe someone on vogons has a clear idea of what they are :

1) white rectangle; (searched the words on google and found nothing)
2)black circle covered with rubber (wich connects to the white wire that makes -5v), i dont want to take the rubber out to look whats inside because i could need to cut it.

DtphHyoWoAI6DWc.jpg

Reply 9 of 11, by ykot

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Curiously, up until now I have been using ATX power supplies (mostly mid-end to high-end versions) wired to AT connector without any load on 3.3V rail and no issues whatsoever.

But I am curious about the dummy load: on the photo I can see a 20 Ohm resistor rated for 10W, which at 3.3V would correspond to 165 mA of current and ~0.5W of power. The load seems to be very small and resistor seems to be rated for much higher wattage, so what is the deal? Would a 20 Ohm / 2W resistor be sufficient for that purpose?

Reply 10 of 11, by cyclone3d

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The white thing is the dummy load. It is a ceramic resistor.

The other thing is a shrink tube wrapped circuit that provides the -5v for power supplies that don't supply -5v by themselves. It is actually a pretty simple circuit.

See here for more info:
https://forum.allaboutcircuits.com/threads/pc … mputers.128266/

It is a shame that the eBay seller antronst is no longer selling them as there is a definite market for them. Maybe they weren't making enough money or were not able to source some of the needed parts anymore.

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