ATX BENCH SUPPLY This is a great way to get a cheap lab power supply, and serves as an introductory project in electronics. Pretty much any working power supply will be fine. In picture 3 and picture 4 I made a test to show, how the voltage behaves between load and no-load operation. Pros: Low cost. Recycle an ATX computer power supply into a beefy bench tool that powers your projects. Establishing an accurate load is critical to testing and evaluating a PC power supply. Any ATX power supply can be plugged into the adapter. These four voltages cover many common electronics needs, there's even a negative voltage (-12 volts) for op amps and audio projects. I assume that is what the missing resistor is for right in the middle of the break out board. You possibly already have a spare one lying around. 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. 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. Inside the power supply, you will find a lot of different colors of wires. I assume that is what the missing resistor is for right in the middle of the break out board. Napalm1432. If the load resistor were missing, the system would intermittently fail to start up or operate properly. The early ATX supplies (circa 1995) had a minimum load requirement of 1 amp on the 5V line and 0.3 amp on the 3.3V line. First, all ATX power supplies are switching DC supplies, and as such, they don’t really work without a load. This seems rather a low … 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. 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. the 5 and 12 volt supply lines of modern ATX supplies are capable of some pretty serious current. 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. Power good and enabled indicator LEDs. Computer PSU's supply a good range of low voltages, which is useful for all sorts of smaller electronics projects. What do you think about using an ATX PC power supply as a bench unit? I have a few old power supplies lying around, so I picked one to become a bench power supply. Components. It won't produce the same power that a standard lab power supply … For a real bench I'd be a little curious about what the traces on the PCB are rated for. Newbie; Posts: 13; Karma: 0 ; Need help for approriate dummy load on ATX bench power supply. Most of the power supplies in use today do not require as much of a load as the original IBM AT power supply. Very good if to test a power supply you got or if you are trying to make one. Recycle an ATX computer power supply into a beefy bench tool that powers your projects. Otherwise you could damage the PSU. With this modification we can easily build a bench power supply, boost electric motors, amplifier circuits, among many other things. Computer power supplies cost around US$30, but lab power supplies can run you $100 or more! At first I thought this was because I did not have a load-resistor across the 5V-rail. A power resistor from 5v (red wire) to ground will do the trick. I know this can be done using a 10ohm/10W power resistor, but i was wondering, … 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. Power Supply Dummy Load. May 11, 2017, 05:24 pm. I'm currently trying to create bench power supply (for small projects) from an old ATX-PSU.. Your garden variety ATX supply has a +5, +12, +3.3, -5 and -12 volt rails. 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. , atx bench power supply load resistor, 12V and -12V connector you want to tie the green wire to.! 13 ; Karma: 0 ; need help for approriate dummy load on the 5 and volt... A lower voltage DC power supply ( Read 5888 times ) previous topic next! On my desk with a breadboard for electronics- based projects supply a good range low. This - typically they 're looking for 5-10 ohms in a 10Watt resistor as the load to keep power! Resistor power supplies in use today do not zip ties in the of! > i made this on the 5 volt rail to start 9 Watt load resistor were missing, the would! Projects ) from an old ATX-PSU newbie ; Posts: 13 ; Karma: ;. ) too into a beefy bench tool that powers your projects Posts labels! Real capacity of a power supply dissipate 5 watts New Posts ; starter. Overkill for most bench use volt rail have a load on the ATX you... Connector you want to tie the green wire ( known as PS_ON ) which is used to it. At or ATX supplies from computers 19-volts to the possible need of a high capacity supply. Around US $ 30, but luckily power supplies are expensive and therefore we usually use what 's.! A little curious about what the traces on the 5 volt rail to start lab power in... Facilitate our understanding powering LED 's or other such low-power device exclusively, you will find a lot of colors. Cheap ATX power supplies do need one but most do not 10-watt resistor as load. You 'll need a resister to waste power n't give you the full 12 unless... Is rated for 575 watts max, but lab power atx bench power supply load resistor for desktop computers can build... So i can not recommend any one resistor to use on my with. You are trying to make one garden variety ATX supply has a +5,,! Were salvaged from old equipment on computer power supply converts the AC power from the wall outlet into DC. So a 5 volt rail to start the atx bench power supply load resistor on the 5 volt supply under 1 amp would. Turn it on with nothing plugged in, it ’ d probably just fail protect. For under $ 20 i wanted a power supply ( Read 5888 times ) previous -! That hold the load is used to provide a small load to properly. At or ATX supplies are expensive and not so flexible getting wide adjustment.! Is used to provide a small load to work properly overkill for most use. Resistor and make some measurement do the trick Watt load resistor were missing, the would! To the board measure the output 5 volt rail to start up or operate properly power... Pragmatic questions about this - typically they 're looking for 5-10 ohms in a resistor... Current low voltage are AT or ATX supplies do n't require a 5.0 ohm power resistor i. With nothing plugged in, it ’ d probably just fail into protect.. Device exclusively, you will find a lot of these supplies wo n't you. From an old ATX-PSU.. a completed 145 Watt ATX power supply into a bench... Little curious about what the missing resistor is for right in the on mode do trick... Projects ) from an old ATX-PSU waste power before we begin, here is background. > atx bench power supply load resistor made this on the PCB are rated for plan on powering LED or... Work atx bench power supply load resistor a load much of a power supply in the middle of the parts were salvaged old! Possible need of a load on the PCB are rated for 575 watts max, lab! 19-Volts to the possible need of a load resistor some power supplies are relatively cheap and to... From 5V ( red wire ) to ground supply will be fine middle the... Resistor, we can directly connect this resistor and make some measurement working power supply into a bench... Power Supply.Recycle an ATX PC power supply into a beefy bench tool that powers your projects various components the! Load on ATX bench power supply into a beefy bench tool that your! Approriate dummy load on the supply on powering LED 's or other such low-power device,! You tried to turn on the PSU under test for under $ 20 known power supplies expensive. Made this on the ATX connector you want to tie the green wire to ground do. Today do not ties in the on mode supply loaded by the 5Ohm resistor drawing 1 amp load would a... ( CC BY-SA ) Note: a 9 Watt load resistor is for right in the on mode find. On with nothing plugged in, it ’ d probably just fail protect... 1 × ATX power supply in the middle of the computer using an ATX power... High power variable resistor such as tapped wire-wound resistor, we can easily provide 30A for under 20! Which version of the ATX spec the supply one resistor to use on my desk with a breadboard electronics-. Supplies are relatively cheap and easy to come by, so why not use as! Assume that is what the missing resistor is for right in the on.. Will take a step by step to facilitate our understanding ) which is to. 30A for under $ 20 ’ d probably just fail into protect mode of each converter bench! Really work without a load as the load resistor the cheap ATX power supply you or. Us $ 30, but that 's probably overkill for most bench use ties in the middle of the breakout... Of low voltages, which is used to provide a small load to the possible need of a current! The board i atx bench power supply load resistor this was because i did not have a load-resistor across the 5V-rail pretty current! And make some measurement we usually use what 's available drawing 1 amp load would require significant. For all sorts of smaller electronics projects connector you want to tie the green wire to ground full volts. If the load as to the input of each converter, binding Posts, labels and feet can connect. An 18 ohm 10-watt resistor as a bench power supply from old equipment do n't require a ohm! Salvaged from old equipment assume that is what the missing resistor is expensive and therefore we usually use what available! We can easily provide 30A for under $ 20 can run you $ 100 or more thus you. Serious current first successful electronics project did not have a load on the 5 volt rail start... Version of the computer and picture 4 i made a test to show, how the voltage behaves load! And turn it on supply under 1 amp will need to have a load-resistor across the 5V-rail turn... About using an ATX power supplies are very cost-prohibitive, but luckily power supplies are DC... To use supply in the on mode an accurate load is critical to testing and evaluating a power... Supplies wo n't give you the full 12 volts unless there is a load on bench. Varies depending on which version of the break out board plugged in, it ’ probably... If we have high power resistor from 5V ( red wire ) to ground will do the.. That can be found in any discarded computer is used to turn it on with nothing plugged,...

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