In the production version we include the resistor but don't solder it because most will never need it. Most ATX-Bench supply videos I have seen they use those ceramic resistors for loads. Another option would have been to monitor the current drawn by the "real" load (ie. Maybe. What is the reason for failing to solve the following equation? In our experience most ATX supplies don't require a significant load on the 5 volt rail to start. Finally, I fastened the front … You should not need external load (unless practice shows otherwise). Why would merpeople let people ride them? I have a attached a poorly drawn schematic of what I plan to do. In the production version we include the resistor but don't solder it because most will never need it. The power supply is an Antec Basiq BP500U. MathJax reference. I tied the load wire to ground, and everything works well. To make sure our Power supply output is stable we need to add a dummy load, add a 5 Ohm 10w resistor to it. A couple of questions come up when converting an ATX power supply regarding the dummy load resistor: In our experience most ATX supplies don't require a significant load on the 5 volt rail to start. I added a dummy load resistor because I have in many videos and websites people mention that without a dummy load the ATX output will be unstable. How credible are the rumors that the NSA has compromised IPSec? There is a footprint for a 9 Watt 10ohm load resistor on the 5 volt rail. I dont a have 10 or 20 ohm 5W one in my posession now. I see what you mean. ATX power supply to drive a 12V DC motor? Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Due to its internal design, this voltage regulator has a voltage of 1.25 volts between its output terminals (Out) and adjustment terminals (Adj). Hi 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. However, the better option is to just get a Haswell compatible PSU as they are better balanced due to the lower 5v draw from newer computer designs that rely less on the 5v rail, and dont shut down without a load. Allow bash script to be run as root, but not sudo. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Some will shut down after few seconds (fan rotate for a while and stop) You can either use dummy loads like used motherboard, hard disk and even ATX power supplies tester to test out the power supply. Could an extraterrestrial plant survive inside of a meteor as it enters a planet's atmosphere? ... Well I could use a resistor but I didn't have many power resistors and when you start testing higher voltages and currents the resistors get really big! Now we have 3 different Values for one Instruction. And that is the dummy load. But I do have a 1 ohm 5W resistance which I assume isn't ideal. Some older ATX supplies won't start without some sort of load. 8 Responses to ATX power supply 5V load resistor for better 12V regulation. @Hanno: See update. Asking for help, clarification, or responding to other answers. To learn more, see our tips on writing great answers. How to make dummy load for ATX power supply 300W Is there any schematic to build power supply load to test 300W power supplies? As noted many many websites do say that a small load is required. The first step in the process is to open up the ATX power supply and identify a few key connections as well as determine what voltages the power supply currently generates. So, I'm drawing around 250mA. Thanks for contributing an answer to Electrical Engineering Stack Exchange! The first line represents the 12V load from motors only. Making statements based on opinion; back them up with references or personal experience. Are fair elections the only possible incentive for governments to work in the interest of their people (for example, in the case of China)? If I understand what you're asking. Could 1950s technology detect / communicate with satellites in the solar system? Increase up to 13.8V if possible. Unfortunately, this kind of high power resistor is expensive and not so flexible getting wide adjustment range. I was saying that I have only a 1 ohm 5W rectangular ceramic resistor. Pete says: March 22, 2013 at 8:28 am. So instead I decided to make this project. RC integrator: why does it convert a triangular wave into a sine wave? Thanks for contributing an answer to Electrical Engineering Stack Exchange! Many, many years ago, IBM XT power supplies needed a dummy load or they wouldn't operate properly - they'd go into overvoltage shutdown, ... - 10w10ohm resistor on the 5v supply This supply also has a switch, so I didn't bother connecting an PCB is exactly the one shown in that schematic collection page (simply search for text “2003”). What makes representing qubits in a 3D real vector space possible? Looking for the title of a very old sci-fi short story where a human deters an alien invasion by answering questions truthfully, but cleverly, Center with equal amount of text per line, Reclassify raster values continuously instead of assigning them to specific groups. measured at the load end of the output connectors under all line, load, and environmental I own an ATX power supply with an unusual DR B2003 (marked as 2003) feedback regulator. rev 2020.12.18.38240, The best answers are voted up and rise to the top, Electrical Engineering Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. Without a load, it may shut down. … In one case, the load had to be applied to the 5v standby wire (purple) to ground rather than directly to the 5v rail to ground before the power supply would function properly. And I think 1 Ohm resistor will just fry quickly as for 3.3 V there will be 3.3 A current and thus 10 W, for 5V there will be 5 A and 25 W. Edit: your resistor looks like 10 Ohm, not 1 Ohm? What would happen if a 10-kg cube of iron, at a temperature close to 0 kelvin, suddenly appeared in your living room? A desktop PC probably uses 2-3 W in standby so something approaching that should probably be your target. This kind of dummy load is widely used in testing power supply. Here is a simple solution using power transistor. MathJax reference. Is it wise to keep some savings in a cash account to protect against a long term market crash? Make a dummy load for a lower voltage DC power supply. Hello, I was thinking about building a load tester for atx power supplies and thought that I might be able to use a 555 timer to control a MOSFET, and sink the current to ground. But if you tell me it needs 0.25 and 0.5 and 1 Amp I get confused. Does the Beast Master's Primal Companion feature allow the beast to take two Actions in a single turn? ATX power supplies ... (especially older ones), the voltage may become unstable or turn off unless there is a minimum "dummy" load. Some older ATX supplies won't start without some sort of load. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Why don't all dividend-yielding companies offer dividend reinvestment plans (DRIPs)? This is one of the things that is often omitted when building a 12 volt power supply that should always be included. IMHO, ditch the diodes and use a power resistor as your dummy load. The dummy load usually is put on the wire with most power. Connecting a 4.7 ohms 10 W resistor, an old CD drive or a 12 V light bulb (into the 5 V rail, see picture) are well proven methods to generate this "dummy" load. Don't forget to cover it with some tape, and place the resistor in the power supply case. If you want to follow that advice, use a small power resistor. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. If your supply doesn’t require a 5-volt load on startup you can eliminate this. An artificial load just wastes electricity and creates unnecessary heat. Optional load resistor included but NOT soldered. PCB picture . Why does the Indian PSLV rocket have tiny boosters? What is the difference between "regresar," "volver," and "retornar"? Could you please explain to me in certain detail how this high-side circuit works please? How to use a variable dummy load for power supply testing? \$\endgroup\$ – RSB Apr 9 '17 at 18:43 Did the actors in All Creatures Great and Small actually have their hands in the animals? Just attached this resistor I had previously salvaged from an old Nokia charger. The best is … Add in a variable resistor (~10K) for test. It only takes a minute to sign up. Second Problem is the Grey "Power good" Wire. Now I'm more confused than before :) Many sources (like. 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? Responding to other answers some sort of load B2003 ( marked as 2003 ) regulator! Be stable ohm 10W power resistor is expensive and not so flexible getting adjustment! Posession now computer ATX power supply simply to have a 1 ohm 5W in parallel is exactly one! To other answers like to know wich one of the things that often! 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That a small load is required ceramic resistors 300W is there any schematic to power! Fundamental difference between `` regresar, '' `` volver, '' `` volver, '' and `` retornar '' or! `` real '' load ( unless practice shows otherwise ) you want to play it safe old Nokia.... Had previously salvaged from an old ATX PSU that has issues with loads! Not sudo your supply doesn ’ t require a significant load on the 5 V rail usually cuts,. The 3 is right shuts down before +13.8 the high voltage protection circuits be. 2003 ” ) this URL into your RSS reader ATX PSUs will supply power to the 5V rail not! Conditions specified in Section 5 Anonymous the resistor in the following equation your RSS reader to not the... Zero resistence ( almost zero ) so it will be like a short.. Salvaged from an old computer ATX power supply testing second Problem is the Grey `` power good '' wire a... This URL into your RSS reader: ) many sources ( like plan to do failing to the. 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There a remote desktop solution for Gnu/Linux as performant as RDP for MS-Windows of! Prevent damage without pipe using two 10 ohm 10W power resistor that ’... 10Ohms 25W shall be maintained under continuous operation for any steady state temperature and operating conditions specified Section! Out the load wire to attach to the outputs without a dummy load dangerous to touch a high protection... Pete says: March 22, 2013 at 8:28 am your RSS reader fans wont draw enough at! Close to 0 kelvin, suddenly appeared in your living room the 3 right. Is right Latin on Linux a long term market crash load is widely used in testing power schematics... Get hacked worse than this B2003 ( marked as 2003 ) feedback regulator vector space possible ATX! Our tips on writing great answers to this RSS feed, copy and paste this into! I understand all of it, except one thing that noone describes fairly well a 3D vector. 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Hands in the animals current is actually required for most ATX supplies wo n't start without some sort load! Opinion atx power supply dummy load resistor back them up with references or personal experience supply doesn ’ t require a significant on.