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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Can I use ATX as a cell phone charge station? [closed]

Can I use ATX with few "DC-DC LM2596 Step-down Adjustable Power Supply Modules" to make a cell phone charge station?
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Few doubts about turning an atx psu into a bench lab power supply [closed]

First, thank you for your time of reading my questions. As the title suggested, my questions are about turning a computer power supply into a lab power supply. I already did my homework and read pages ...
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5V charging through ATX PSU? [closed]

I've an ATX power supply and I'm trying to charge my Nexus 5 phone. I connected USB female (from an old PC) to +5V and GND and shorted the DATA+ and DATA-. My multimeter shows 0.400A when I connect my ...
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Why do graphics card power cables (PCIe, etc) use more than two wires?

High-end graphics cards need more power than can be delivered through the PCI slot. One option would have been to deliver the extra power using a 4-pin Molex or SATA power connector, but recent ...
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215 views

Increasing 12V Rail current on power supply for mobile computing

I am building a miro-itx slimline pc for my mobile home that is powered by solar. I have selected a GPU with a rated TDP of 120 Watts and a CPU with a TDP of 53 Watts.I purchased a DC-DC buck ...
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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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Troubleshooting PCB of an ATX power supply? [closed]

Im new to PCBs, know the basics of electronics and testing of individual components. I have a PCB (of an ATX supply) that is not working when I power it, so I thought of testing each components like ...
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1answer
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How should I wire up ground when using an ATX power supply to power an Arduino and several LED strips which in return are controlled by the Arduino?

Forgive me if this seems like a basic question but I want to make sure I wire these things up correctly. Currently, I have several LED strips that I am controlling with an Arduino and they are ...
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484 views

Should I power my device using USB 5V or PC ATX PSU 5V? Crazy idea: use both?

I am designing a little device to use inside my PC. My circuit contains a microcontroller which needs to communicate with the host system, and I wanted to do that via a USB port. The microcontroller ...
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267 views

What is needed to power a netgear switch with an ATX style PSU?

I'm hoping to power a couple 8 port netgear switches from an ATX style PSU. The netgear switches require 12v 1amp DC power. I'm hoping to create a few cables which convert the 2.5mm coaxial power ...
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An “standard computer power supply” [closed]

I'm trying to use an ATX connector. https://www.sparkfun.com/products/9498?gclid=CjwKEAiAjsunBRCy3LSlz_PJqCgSJACJY7yKBmbtZzitS08I2EKyfFqex4UVlCzSfHP8GdYK2TNvChoCrkPw_wcB In the product description, ...
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Flexible long wire for high currents

I have an ATX power supply which has got multiple 5v outputs (at a maximum 40 amp current). I am willing to use it to power up a moving mechanical system 5-10 meters away. The problem is that since ...
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1answer
914 views

Designing power supply with 5v and 3.3v from a 12v supply with switching regulators

I have 12V DC coming in from a power brick and I need to supply 5V @ 1A for USB and 3.3V @ 5A max for mSata and PCIe. I basically need to make a small atx power supply that I can integrate on my ...
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2answers
717 views

ATX POWER_OK signal not provided to molex connected peripherals such as HDD

From Wikipedia: The Power Good signal prevents a computer from attempting to operate on improper voltages and damaging itself by alerting it to improper power supply. The ATX specification ...
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ATX power supply shuts down

I'm working on a power supply for my camera (powershot SX150IS) in order to leave it on for long periods of time. So I took an old power ATX power supply and connected the 3.3V output to the camera, ...
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Does an ATX power supply have any isolated outputs?

I am working on an application that requires isolated power inputs. Wondering if the standard ATX PSU has any isolated outputs? Why are we having multiple ground pins on the Connector?
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ATX Power supply 5V rail Peak Current

We have setup, where 16-24, 2.5" Drives will be arranged in mobile racks of( 8 or 12 each). We are selecting ATX SMPS to satisfy these needs. We need to power these drives with a ATX Power Supply. ...
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2answers
903 views

Can I use a 12V 70A source to convert/boost to 24V 5A supply?

I have a self built custom made computer that is using a Ultra X3 1000 watt power supply. Over the years I have been reducing the power needs by adopting more energy efficient hardware. My computer is ...
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844 views

Power arduino board from ATX PSU?

Can I power the Redboard Arduino board (basicly the same as Arduino Uno) from the + 12 V output from my ATX power supply? The specifications says the input voltage needs to be at least 7 V. Is there ...
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I am messing around with some power supplies. There are pinouts labelled “reserved” and “remote”- what are they?

I have worked out that that the Remote pin works like the Green "Power Supply On (active low)" wire on an ATX supply, and found a wiki on remote sensing about it being used to get diagnostics on the ...
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310 views

Timed LED circuit with ATX PSU, help

I want to make a circuit that turns on and off the light (LED) of a given time (eg. on 9 pm and off 6 am). I also want it to be adjustable. My idea about the design: I will be using an ATX computer ...
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1answer
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Charging battery using computer power supply?

I have new 600W ATX computer power supply unit. I have wired green and black together to make power supply turn on when plugged in. I wanted to charge my 12VDC empty battery, without dealing damage to ...
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ATX-PSU to supply PC and RaspberryPi

I want to integrate a RaspberryPi into the case of my desktop PC, that has an ATX-PSU. I want the RaspberryPi to keep running, even if the PC is shut down. It would be nice to avoid the additional ...
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Power ATX motherboard from JAMMA

I have some arcade cabinets with computers in them, and I'm using a regular PC PSU for them, which sucks because it takes up so much space. I know there are pico-psus on the market, but I don't ...
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Convert the input of an ATX power supply from 110 V AC to 11-14 V DC

I was just wondering if it is possible to convert an old ATX power supply for my server. It feeds with 110 V AC from the grid, but I want to operate my mainboard directly from the solar battery, which ...
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Simple transistor for switching a computer power supply

I am teaching myself about simple transistor circuit design and have been stumped by the simplest transistor behaviours. The task I have set is to use a transistor to switch on an ATX computer power ...
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1answer
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Magic smoke released from DIY PSU… but why?

I'm starting to learn what I can about electronics, and recently decided to follow this (and similar) guides to building a bench power supply out of an ATX PSU: http://www.instructables.com/id/Convert-...
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623 views

What is the correct way to interface 3.3v logic with the PS_ON# 5v signal on a standard PC power Supply?

The PS_ON# line of a standard ATX PC power supply needs to be pulled to ground to turn the supply on. The signals on an ATX supply are 5v logic according to the standard. I'm trying to re-purpose an ...
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Does an ATX PSU's PS_ON Signal Require Resistance

As the title suggests; when connecting the PS_On signal directly to ground in order to switch on an ATX PSU, is there a required amount of resistance? - To try to clarify my particular problem; I ...
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ATX Computer PSU: OK to connect loads between positive rails, e.g. +12v to +5v

I have looked, but haven't find an answer. Are ATX computer PSUs capable of having a load connected between their positive rails, so that for example, current would flow from a 12v rail to a 5v rail? ...
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How to use a NPN-Transistor to get status LEDs for an ATX power supply?

There are many instructions "How to Convert a Computer ATX Power Supply to a Lab Power Supply". Often they suggest they suggest to place to staus LEDs to indicate it the power supply is turned on or ...
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Using PWR_OK to Activate an ATX Power Supply Automatically

Okay so, I have an ATX PSU that isn't connected to a motherboard, and I'm currently using the simple paper-clip trick to ground PS_On in order to trick the PSU into ...
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2answers
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Why have atx power supplies need selector voltage?

I am studying various ATX power supplies schematics and don't understand the need of the voltage selector as switching power supplies work at range of voltages. In most schematics i see the 110V line ...
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ATX PSU: Simple dummy load?

To use an ATX supply outside of a PC while preventing output voltage to run away at low/no load, can I just use a couple of diodes in series to provide some kind of voltage-dependent load? Like: ...
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1answer
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Different voltage rails output filter does share same core

I am reviewing circuit diagrams of ATX power supplies. I have noticed this in almost all different designs of ATX power supplies. Different voltage power rails output filter share a one core [ toroid ]...
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Can I get 24V from ATX PSU using 12V and -12V cables?

ATX PSU's have one -12V cable, and a few 12V yellow ones. Could I power up a 24V device by connecting 12V to + on the device and -12V on -?
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Can an ATX PSU power a USB port directly?

I'm going to build a benchtop PSU from an ATX PSU, and I would like to add a USB charging port on it. It should be able to power an Arduino or charge my (non-Apple) phone. (I know Apple devices ...
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2answers
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ATX power supply front-end: How does this work?

I've been trying to educate myself on general power supply operation and stumbled across several schematics for ATX power supplies. In general I understand how a SMPS operates, and an ATX PS is just ...
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ATX PSU 5VSB + 5V

Is it possible to connect both the 5VSB and 5V pins of an ATX PSU to provide +5V? I would like to be able to initially boot using the 5VSB, which is always enabled. Once I've completed setup I would ...
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Why is there a -12V rail for ATX [duplicate]

The ATX specification includes a -12V (and an optional -5V) rail on the main power connector. What are these negative voltage rail used for on the connected circuits?
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LED specs for atx power on status

Most ATX motherboards have those same pins for 'interfacing' with the computer case... depending on the manufacturer they vary on position (hence loose wires at the case end) but never function. So i ...
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1answer
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What is the capacity of capacitors in this power supply circuit?

Imagine the following circuit with two capacitors and diodes acting as passive PFC. My question is what is the capacity of these two capacitors? I mean compared to a circuit with just a single ...
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1answer
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Atx psu 7v output [closed]

What is an easy way to get 7-7.2vdc from an scavenged atx psu? I had thought about using a lm317 but I'm going to need at least 5-7 amps of current, and the 12v-5v split just sounds like a really bad ...
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How to power a motherboard from a 24V source? [closed]

I would like to power a ATX motherboard from a 12V or 24V power source. Does anybody have some circuit?
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1answer
126 views

Embedded PS vs ATX PS, can they used in place of each other?

The embedded power supply in my machine has gotten damaged/weak, It is used for powering only the Embedded Computer/Controller on the Machine. The Embedded Power Supply looks something like this. http:...
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2answers
9k views

Voltage Regulators in Computer Power Supply?

I have a damaged ATX 230WCE power supply unit and wondered if I could find 12V, 5V, and 3.3V Voltage regulators inside. I tried looking in another unknown model psu and only found transistors and ...
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How can I power my 6-pin PCI Express card without using an ATX power supply?

One of my older computers has a 365-watt power supply that, for various reasons, cannot be replaced with a new power supply. I would like to upgrade the graphics card in that computer, but all the ...
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1answer
1k views

ATX power supply specification question

I read the ATX power supply design guide, and I have a question related to the PWR_OK line specifications. In "Table 21. PWR_OK Signal Characteristics" I saw the following: "Logic level high - ...
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900 views

Computer SMPS is working with high electric shock spreading [closed]

Sir, I have a ATX SMPS, today its working and connected LCD monitor will be blinked anonymously, i touch the cabinet I get a electric shock from the cabinet, also CPU working and Its have high ...
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4k views

ATX power supply max current 12V P8 connector

I'm using a ATX power supply as a unit for my project. The power supply is of the type "be-quiet" straight-power E8 480W with cable management. I cannot figure out how much current can I get from the ...