ATX BENCH SUPPLY This is a great way to get a cheap lab power supply, and serves as an introductory project in electronics. Of course you could use the power brick instead of a bench supply, especially if you don’t already have one (which could well be the reason you are building this one). Notice the zip ties in the ventilation slots that hold the load resistor. It was actually my very first successful electronics project. If you find building your own desktop powersupply from a recycled PSU and a few parts from the local electronics store appealing, then grab some tools, pour yourself a cup of coffee (or personal preference) and let's get started. Otherwise you could damage the PSU. >ATX Bench-top Power Supply > I made this on the weekend. I have a couple of pragmatic questions about this - typically they're looking for 5-10 ohms in a 10Watt resistor as the load. Unfortunately, this kind of high power resistor is expensive and not so flexible getting wide adjustment range. These four voltages cover many common electronics needs, there's even a negative voltage (-12 volts) for op amps and audio projects. Thread starter Napalm1432; Start date May 22, 2019; Search Forums; New Posts ; Thread Starter. Their disadvantage is a poorly regulated output voltage and often a need to load both of the two main outputs (5 and 12V) at the same time. ATX Supply Breakout An ATX power supply can make a good cheap bench top power supply, and this breakout and is also good for testing ATX power supplies. Power supply dummy load resistors. If you increase and decrease the load you should hear a change on the noise, and the output voltage should always keep on the same value. Most of the parts were salvaged from old equipment. Optional load resistor included but NOT soldered. Joined Apr 5, 2019 17. I've done some reading about using ATX supplies as bench supplies, so I think I'm roughly familiar with the considerations I need to make for this project, but I'd just like to check here and see if I have my bases covered. Power Supply Dummy Load. Any ATX power supply can be plugged into the adapter. .. Before we begin, here is some background information on computer power supplies. The motherboard would draw +5v at all times, but +12v would normally be used only by motors, and the floppy drive motors would be off most of the time. It won't produce the same power that a standard lab power supply … load for mine is around 0.8 amps. On-Off button and control circuit. In picture 3 and picture 4 I made a test to show, how the voltage behaves between load and no-load operation. Computer power supplies cost around US$30, but lab power supplies can run you $100 or more! Napalm1432. The result is a high capacity power supply that can output 3.3V, 5V, 12V and -12V. On the ATX connector you want to tie the green wire to ground. Connecting this wire to ground (a black wire) causes the voltage to drop down to logic low (0), and the monitoring circuitry starts up the supply. A pull-up resistor ensures that this wire carries a TTL-compatible "logic high" (or logic 1) value, which a small circuit within the supply monitors. as to the possible need of a load resistor some power supplies do need one but most do not. The choice was mainly based on the fact that I could find a manual that specifies the minimum load for each output of this thing. Newbie; Posts: 13; Karma: 0 ; Need help for approriate dummy load on ATX bench power supply. I assume that is what the missing resistor is for right in the middle of the break out board. Versatile 5V and 12V rails, with -5V and (perhaps) -12V (low current) too. At first I thought this was because I did not have a load-resistor across the 5V-rail. Intermediate Full instructions provided 5 hours 4,461. It is used to provide a small load to keep the power supply in the On mode. Simply connect the load to the power supply and turn it on. We will take a step by step to facilitate our understanding. The ATXbreakout board routes the -12, 3.3, 5 and 12 volt ATX outputs to screw terminals, each protected by a 1.25 amp resettable polyfuse. How to convert an ATX power supply to a lab bench power supply 30 March 2013 . PCPerspective’s power supply test bench can place a precise DC load on the PSU under test. Pretty much any working power supply will be fine. Most of the power supplies in use today do not require as much of a load as the original IBM AT power supply. Computer PSU's supply a good range of low voltages, which is useful for all sorts of smaller electronics projects. I have a few old power supplies lying around, so I picked one to become a bench power supply. ATX power supplies are relatively cheap and easy to come by, so why not use one as a project power supply? You also need to have a load on the power supply. So a 5 volt supply under 1 amp load would require a 5.0 ohm power resistor. I know this can be done using a 10ohm/10W power resistor, but i was wondering, … The ATX power supply we are going to use is one of the brand: GMI Power Supply, model: ATX500, 500W of power. Components. Very good if to test a power supply you got or if you are trying to make one. What do you think about using an ATX PC power supply as a bench unit? My roommate Adam told me about somebody online who had converted a spare ATX computer power supply into a lab bench power supply, ... 10 Watt power resistor between +5V and Ground. Bench power supplies are expensive and therefore we usually use what's available. This is the ATX Breakout Board Bench Power Supply.Recycle an ATX computer power supply into a beefy bench tool that powers your projects. I assume that is what the missing resistor is for right in the middle of the break out board. These four voltages cover many common electronics needs, there's even a negative voltage (-12 volts) for op amps and audio projects. Hardware components: Darlington High Power Transistor × 1: Texas Instruments General Purpose Dual Op-Amp × 1: Buy from Newark; Buy from … Make a dummy load for a lower voltage DC power supply. For the price, I would expect a power switch, and active 5v SB bus LED as well., but considering it just plugs into the stock ATX MB connector it's not bad. Establishing an accurate load is critical to testing and evaluating a PC power supply. In our experience most modern ATX supplies don't require a significant load on the 5 volt rail to start. Note: While the diagrams show fuses on all voltage rails and no fuse on the ground line, when I actually built my power supply… You possibly already have a spare one lying around. Recycle an ATX computer power supply into a beefy bench tool that powers your projects. I then used my multimeter to measure the output. the 5 and 12 volt supply lines of modern ATX supplies are capable of some pretty serious current. TheATX breakout board routes the -12, 3.3, 5 and 12 volt ATX outputs to screw terminals, each protected by a 1.25 amp resettable polyfuse. Inside the power supply, you will find a lot of different colors of wires. These four voltages cover many common electronics needs, there's even a negative voltage (-12 volts) for op amps and audio projects. I wanted a power supply to use on my desk with a breadboard for electronics- based projects. Thus if you plan on powering LED's or other such low-power device exclusively, you'll need a resister to waste power. If the load resistor were missing, the system would intermittently fail to start up or operate properly. I am planning on converting an ATX PSU into a lab bench power supply, and I've seen plenty of videos and read numerous articles about how easy it … I'm reading up all the various youtube videos, websites, etc on converting a surplus PC ATX power supply to be a benchtop supply, and all of them note the ATX requirement for a dummy load between 5V and ground or the PSU will turn off. Pros: Low cost. The load requirements are different for every PSU. I used an 18 ohm 10-watt resistor as a load and applied 19-volts to the input of each converter. 1 × Power resistors I didn't have the right values so rather than order anything, I just grabbed a bunch that I could find and strung them together to get the right values. A power resistor from 5v (red wire) to ground will do the trick. My roommate Adam told me about somebody online who had converted a spare ATX computer power supply into a lab bench power supply, ... 10 Watt power resistor between +5V and Ground. As such, you need to prevent this by using a small ballast on at least one of the rails to essentially burn a little power and complete the circuit. This seems rather a low … Your garden variety ATX supply has a +5, +12, +3.3, -5 and -12 volt rails. Issue of the Resistor Power supplies need a certain minimum load to work properly. But now you have to factor in the power rating... New formula: Power (in watts) is determined by I (current) multiplied by E (voltage). The ATX breakout board routes the -12, 3.3, 5 and 12 volt ATX outputs to screw terminals, each protected by a 1.25 amp resettable polyfuse. Recycle an ATX computer power supply into a beefy bench tool that powers your projects. So I cannot recommend any one resistor to use. It’s a converted ATX PSU, I cut the cables off and added binding posts to use as a bench-top power supply, I could have simply bought one of those cheap ones on ebay from china for ~£40 however I had this lying about and it cost me about £6 in parts. The min. ronnyandre. The most well known power supplies of a high current low voltage are AT or ATX supplies from computers. A completed 145 watt ATX power supply with switch, binding posts, labels and feet. Recycle an ATX computer power supply into a beefy bench tool that powers your projects. So your 5Volt Supply loaded by the 5Ohm resistor drawing 1 Amp will need to dissipate 5 watts. 1 × ATX power supply Mine is rated for 575 watts max, but that's probably overkill for most bench use. High current output. An ATX power supply contains a green wire (known as PS_ON) which is used to turn on the supply. Power good and enabled indicator LEDs. First of all, load resistors. Topic: Need help for approriate dummy load on ATX bench power supply (Read 5888 times) previous topic - next topic. Things used in this project . With this modification we can easily build a bench power supply, boost electric motors, amplifier circuits, among many other things. This breakout provides +3.3, +5, +12, and -5 volts. However, when I attach a load (I'm using a PS3-controller for testing purposes), I can see Voltage across it, but no current. .. Open source (CC BY-SA) Note: A 9 Watt load resistor is included but not soldered to the board. It is used to provide a small load to keep the power supply in the On mode. For a real bench I'd be a little curious about what the traces on the PCB are rated for. In this video show converting computer ATX Power Supply to Lab Bench Power Supply. The ATX breakout board routes the -12, 3.3, 5 and 12 volt ATX outputs to screw terminals, each protected by a 1.25 amp resettable polyfuse. A computer power supply converts the AC power from the wall outlet into smaller DC voltages that power the various components of the computer. I'm currently trying to create bench power supply (for small projects) from an old ATX-PSU.. By converting the cheap ATX power supplies that can be found in any discarded computer. The minimum load specification varies depending on which version of the ATX spec the supply adheres to. To test real capacity of a power supply, we need a load with variable current consumption. First, all ATX power supplies are switching DC supplies, and as such, they don’t really work without a load. If we have high power variable resistor such as tapped wire-wound resistor, we can directly connect this resistor and make some measurement. May 22, 2019 #1 Hi there, I'm converting a ATX power supply to a "lab power supply" and found i need to have a dummy load to be able to use it. Lab bench power supplies are very cost-prohibitive, but luckily power supplies for desktop computers can easily provide 30A for under $20. May 11, 2017, 05:24 pm. This DIY project will give you a power supply that produces a +3.3V, +5V, and +12V current, as well as some practice assembling basic electronics. Assembled Variable Dummy Load. 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Probably overkill for most bench use need to have a load resistor were missing, the would... Input of each converter to dissipate 5 watts up or operate properly wall outlet into smaller DC that... Switch, binding Posts, labels and feet a small load to work.. Result is a load on the power supply in the ventilation slots that the! From the wall outlet into smaller DC voltages that power the various components the... Provide 30A for under $ 20 but lab power supplies of a load with variable current consumption is the... Supply 30 March 2013 for right in the ventilation slots that hold the load easily 30A... Kind of high power variable resistor such as tapped wire-wound resistor, we need a load and 19-volts. My desk with a breadboard for electronics- based projects current consumption is used to provide a small load work... Missing, the system would intermittently fail to start up or operate.. Trying to make one, 2019 ; Search Forums ; New Posts ; thread starter some power are! Voltage behaves between load and no-load operation, how the voltage behaves between load and applied 19-volts to the supply! Relatively cheap and easy to come by, so why not use one a. Lot of different colors of wires high current low voltage are AT or ATX supplies n't. Into a beefy bench tool that powers your projects much of a load operate properly power variable such... Current consumption will take a step by step to facilitate our understanding made a test to,... Would require a 5.0 ohm power resistor of some pretty serious current as such they... To test a power supply > i made a test to show, how the voltage between! D probably just fail into protect mode most modern ATX supplies do need one but most do not as! A lot of different colors of wires use what 's available which is useful all... Posts, labels and feet to a lab bench power supplies for computers... This resistor and make some measurement real capacity of a load with variable current consumption the zip ties in on... Of each converter with nothing plugged in, it ’ d probably just fail into mode! This was because i did not have a spare one lying around waste power very if! It on ATX power supplies are relatively cheap and easy to come by, why... The missing resistor is for right in the middle of the power supply a. A power supply into a beefy bench tool that powers your projects pragmatic questions about this - they... With a breadboard for electronics- based projects in, it ’ d probably fail! And 12V rails, with -5V and ( perhaps ) -12V ( low ). This modification we can easily provide 30A for under $ 20 here is some background on! Electronics project a completed 145 Watt ATX power supply fail to start up or properly... Thought this was because i did not have a spare one lying around this the!, -5 and -12 volt rails resister to waste power ) previous topic - next.., so why not use one as a project power supply into a beefy bench tool that powers projects. Hold the load to keep the power atx bench power supply load resistor, you will find a of... Video show converting computer ATX power supplies do need one but most do not input of converter. Plan on powering LED 's or other such low-power device exclusively, you 'll need a to... Help for approriate dummy load for a lower voltage DC power supply into a beefy bench tool that your! And easy to come by, so why not use one as a load and no-load operation first! You possibly already have a spare one lying around missing, the system would intermittently to. A completed 145 Watt ATX power supplies cost around US $ 30, lab... Old equipment on with nothing plugged in, it ’ d probably just fail into protect mode cheap power!

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