Questions tagged [atx]

ATX is the standard for PC power supplies. It has +3.3 V, +5 V, and +12 V. They share a common ground. It has a PS_ON# signal which needs to be grounded to turn it on. Don't open power supplies that run on line voltage (AC). They have dangerous voltages and currents inside

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ATX power supply doesn't cut the current after being turned off

I made a power supply for my electronic projects using a ATX power supply of a older computer and used a button connecting the black and green wires to turn it on/off. I noticed that sometimes when I ...
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696 views

Advanced ATX Power Supply Modifications

I know there are multiple tutorials and questions regarding converting an ATX power supply, new or old, to a benchtop power supply for projects. I'm fully aware of how to make the basic conversion to ...
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60 views

Computer power supply outputs 5.20 volts at 3.3 volts rail

I got an old 420 watt Tagan power supply. It seems pretty good quality. I wanted to convert it into a bench power supply. It worked fine until I THINK I messed things up. I’m not sure if i actually ...
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105 views

ATX Power Supply Pin Material? (gold or tin)

I'm planning to use an ATX power supply to power a small set of 12v devices. I've read plenty of guides about adapting ATX -> bench supply, but I can't seem to find any mention of the connector ...
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1answer
98 views

Is it bad to load one rail of a power supply vastly more than the other?

I am trying to modify a Delta DPS-400AB-17 server 1U power supply to support a desktop motherboard and graphics card. The power supply has an 8 pin 12V EPS connector attached to a 21A 12V (252W) rail. ...
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311 views

EPS12V 8pin from ATX PSU with two separate 12V rails

This is your standard EPS/ATX12V connector used for feeding the main processor VRM on a computer motherboard. The two 4pin connectors can be attached together to create an 8pin connector. The top four ...
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114 views

Molex 5556 vs. 44476 Terminals for ATX / EPS connectors

I'm looking into terminating a custom-length power supply extension cable to make everything look nice / fit in an awkward case. While researching parts I noticed that the EPS12V v2.0 specification ...
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1answer
184 views

Is it safe to toggle a led strip powered with 12v ATX PSU line?

I connected a segment of a led strip (12v) to a line coming from a standard ATX PSU (12v line, of course). I just wonder if it is safe to put a toggle switch to turn on/off the led strip, or may be ...
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159 views

ATX power supply only 0.1A from 12V rail?

I have a project which requires a high current output (potentially 60A). Rather than get a lab bench supply, I got hold of a Corsair ATX AX1200i that can supply a max of 100.4A on the 12V wire. I've ...
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31 views

15v from 20pin and/or 24pin ATX Power Supply. Connecting PSU circuits in series

I have a portable 12v car battery charger, jumper, maintainer, and inverter with integrated USB ports, 12v car adapter slot, jumper clamps, emergency LED light, and a 3 prong 110v/60hz wall outlet. It ...
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32 views

Grouping 12V ATX lines for measurements

I'd like to measure the power draw of my CPU. The way that seems the most straightforward to me is to cut into the ATX12V cable and put a shunt based sensor in the middle of the 12V line. Now in the 4 ...
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1answer
81 views

ATX PSU turns off under heavy 12V load, unless increased gradually

Following the well known instructions I've built the PSU from a spare 500W ATX. I've used 10 Ohm resistor for artificial load on 5V line. When I connect 1A load to 12V line, the ATX shuts off. I need ...
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58 views

Figuring out ATX Power Supply max output

I have a Delta DPS-400AB-17B power supply, and I am planning to change over some of the connectors to different ones. I want to make sure I don't overload any of the 12v 18awg wires, so I am figuring ...
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144 views

How to calculate the average current

I have an ATX which the yellow wire is "+ 12 v ,18 amp" and "blue is -12v , 1 amp". When I use them together I got 24 v but I am confused how to calculate the max ampere. How to ...
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93 views

ATX power supply turns off when used with DIY boost converter

I am trying to build my own step-up boost converter. I have my connections as shown in the following schematic (except for the one circled in red.) First I powered up my step-up module with a ...
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65 views

Windshield motor with ATX power supply keeps shutting down

I need to connect my windshield motor (12V) to my ATX power supply from old computer. I've tested the motor on my bench power supply and i draws around 1,5A @ 12V, so it should be well in range of the ...
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68 views

Reason for capacitor on ATX 12V+ wire

I'm using a computer PSU to power several controller boards and sensors. To be more precise, I'm using the 24pin ATX connector wires to power everything. There are two 12V+ wires coming from the ...
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90 views

Abusing EPS connector to power LED's?

I'm working on the wiring harness for a PC build that's going to include a bunch of (5050) LED strip lights. The strips will be wired to fan connectors (more details at end). For testing, I've been ...
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62 views

Water pump, PSU and surges

I've got a home-built watercooler that I've been using for more than a decade on my personal PC. The unit has a single switch for the AC mains (120V 60hz) that splits to power both the AC waterpump, ...
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190 views

Why does the output voltage from 180W ATX PSU on +12V rail deliver only +9.6V to +9.7V?

I recently got three ATX PSUs which I plan to use as bench supplies. I've successfully managed to get one of them (250W) converted and running as bench supply. But the other two a 150W and 180W. The ...
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2k views

Is this resistor sufficient as dummy load in an ATX 250W Dell PSU?

I have attached a 20 Ohm resistor to my Dell PSU on the 5V rail since its a 2004 PSU and most of the current is on the +3.3V & +5V rail. I have seen on most youtube videos where they mention using ...
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72 views

Does ATX specify the load currents?

I find it difficult to see the elecrtical specs of ATX PSU. You can, for instance, have this cheap block or another one but their homepages just say that PSUs are ATX-2.2/2.31 compliant and I see no ...
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280 views

Converting ATX PSU to lab bench PSU

I am currently trying to convert my ATX PSU to lab bench PSU. But I ran into a problem. I want to attach a dummy load, but I am not sure if I should use 12V or 5V. On label it says that ...
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264 views

Center tap transformer pairing with ATX PSU

I'd like to use both a beefy center tap transformer (220v to 24-0-24, 1000VA) and an ATX PSU togheter, to power some lab equipment. So I isolated from case the ATX GND on DC side as the case is earth ...