Great video. You might want to add a disclaimer. Reading through some of the comments/questions, it's quite obvious some people trying this are clueless about electricity and electronics. 12 volts is not going to electrocute anyone. But, at 20+ amps, you're going to get a heck of a burn. You are also exposing yourself to the household mains. Brushing across that will ruin your day.
Thank you for going in to more details, as most just fly right thru it. I particularly appreciated the standby mode. I have an older model but no main power switch that came with it. Without a main power switch, the one LED lite that came with it would stay on as soon as you plug the unit in and even when you connect a switch to green and black, the LED would stay on until you unplug the AC. The details you did go over in your video was enough to fill in all the little gaps I was experiencing on my mod!
I want to use a pc power supply to power my diesel heater which will use up to 10 to 15 amps to power the glow-plug . My power supply 12volt says it will put out up to 30 amps? So i just connect all the yellow wires to get that ip to 30 amp potential?
Nice easy conversion! One change I would make is that instead of reserving a red wire for the Power On LED, I would use the grey wire. The grey wire is the Power OK confirmation signal to the PC, which also carries 5 volts but only after the unit is switched on AND the unit has performed a self-check. So, not only does it confirm that the power is ON, it also assures you that the unit is working properly and the voltages will be within reasonable expectations.
What if multiple 12v dc, 5v dc, and 3v dc? say 2-3 of each v.-power? OR does it need all yellow wire soldier together? I want to make a power supply for multiple Raspberry Pi projects used at one time.
Could I build an External 800W AC-DC Power Brick from an ATX/SFX PSU following these steps? The project I have ongoing will be using a HDPLEX 800W DC-PSU to power a SFF AIO computer and it will need external AC Adapter(s). I was thinking I might get two Dell 330W Laptop Adapters but an ATX 800W converted to something like this might be much better.
I want to make this power supply mainly for 12volt supply but you mentioned the resistor on the 12 volt line. How do I know if my power supply needs it? I’m not sure if mine is “old” or “new” as you put it.
Hi, i placed my load resistor at 12 Volt line. Characteristics, Load resistor: 15W 22Ω (i couldnt find at 10W), line: 12Volt, min: 0.3A, max: 18A. My load gets really hot, maybe is the normal hot i do not know, is it ok addind that resistor with that characteristics or should i add some an extra Silicone Ceramic Resistor? I attached the load at chassis adding thermal paste in order to make some heat get absorbed, is that ok?
Can you help me with something? I built mine and connected -12v as negative and 12v for positive in the regulable exit. I used a DC motor for testing but the entire power supply shuts down at ±3V, what can I do?
I have an older ATX with 14 amps on the 3.3V line, 30amps on the 5V line and only 10 amps on the 12 V line I used a 8ohm/50W resistor on the 5V line and when I connected a small cooling fan 12V/950milliamps the voltage drops to 11.05 volts why is this happening when the 12 volt line should handle upto 10 amps and stay stable Please help me and reply Thanks Dan
I have a DC pump that I use for pumping oil. do you think I could use a computer power supply to run it? I figured since it hooks up to my 12v battery that it might work with the 12v power supply. it uses 13.5 amp. I have an old AT power supply that I want to try. it has an external on/off switch with a white, blue, brown and of course black for ground. wire harness has Black (ground), Yellow (12V), Red (5V), Orange (Power Good), Blue (-12V) and White (-5V) I believe. does this sound correct? do I need to put in resistors for an AT power supply? ty for your assistance. 🙂
hi.. thanks r making awesome video such as this one.. i am trying to make one similar.. everything works out fine when testing.. but when i put my +12v bundled wire to the binding post the atx wont start.. where does it go wrong?
Hi OK I do understand what’s the 12 V used for but I do not understand is Watt the 5 V can be used for and the 3 V watt it can be used for please explain thank you
Hello, I have done a DIY atx work bench supply unit. I successfully completed the project and was using the 12v line briefly. I finished and unplugged my ATX psu and sat it to the side. I return to use it again the same project as before and It doesn't turn on. I am getting a 5v from my standby. My Green is soldered to a ground. I have completely take it back apart. Redone all the wires and checked my load resistor. My Brown wire is hooked to my orange, my grey is hooked to a resistor than to a ground. I have a 5v line hooked to a 10w 10ohm resistor. I am using fuses on all power lines also. They are still in working condition. SO after i do some doctoring and make sure all is well. I plug her in and nothing. But im getting my 5v standby. So its harnessing power and after turning it off you can tell the circuit is good simply because the meter will read 5v for a good min before SLOWLY dropping down. I have tested the other power leads with no luck. I thought maybe the fan was shot. Any advice would be beneficial . Just looking for brainstorming ideas to tackle next. This is not my first atx mod either. I have built a few. Even using them to power Car amps for partys and etc..
have u fixed it yet? what is the grey wire used for? slowly dropping means that it is getting hot somewhere and thermally shutting down. what is the 5V standby?
I know this is an older video, but on the Green wire. I’m needing to build 2 power supplies 12v dc only. I’ve seen videos that say to connect the Green to Gray. However I’ve seen more that say Green to any Black wire. Is this just a preference, or should it be one or the other for specific reasons?
I got a 750w power supply to run two 12" subs in my house. I need the yellows for +12v but what do I do with reds and orange? I'll only ever use it for this so can I just tape/cap them off? Do I need a resistor?
so iv been using one to power my subwoofer for a long time but i could never use it to its full potential. can i use two power supplies to power one amplifier? i think its a 2,000 watt amplifier and my subwoofer has a 1,400 watt peak. also i took all my car audio out of my car so im using my car stereo with that and i just dont know what the best way to do all that is haha i want the one subwoofer, two truck speakers and the stereo because its going to be for my theater and i dont want to spend all kinds of money when i have all this good car audio stuff laying around. haha how should i go about powering all this?? 3 cps's, one for each amplifier and one for stereo or what?
Great video. Much easier to follow than the other atx to power supply videos I watched. Maybe I missed it, I rewatched several times so I don’t believe I did, but you do not explain how to wire in the 2 LEDs. I assume standby is wired to the original on/off power switch and the master on light to the new master power switch? I’m no expert and don’t want to screw something up as we’re dealing with potentially fatal currents here. Any advice or an update would be appreciated. Also are the LEDs why you have 2 330ohm resistors listed in the parts list but don’t show them being used?
I have trouble with mine,when i bridge green and black... my supply turns on,and then shortly,off again... even with shunt still in place... Any idea,what may cause this.. ?? Hopefuly you can sort it out.. why it is so.. 😊 so mine can funktion as well..
If I only want a 12V power supply, do I still have to have the load resistor on the yellow wires? I have no need for the 3.3v or 5v. I plan on shrink wrapping the 3.3v and 5v wires and stuffing them back in the case.
Hi again. I made my first one last year. It is from 1999 and shaped like a panini. Only 65 watts but it works without the load resistor. Also , it turned on without having to use a jump wire. I`m ready to graduate on th project so I want to Make a second one from a 300w psu. I see you are putting the load resister between 2 yellow 12 v wires. Why not use the 5v wires? I dug up a lot of ceramic rectangular 5 and 10 w load resistors from old small TV's. Which one should I use and why? Can you explain the function of the resistor again? Anyone may reply, just means more knowledge transference!
hello, I made a mistake of hooking up all the wires before testing the power supply to see if it was working is there a way to test the power supply to see if it is getting power...the fan doesn't even work?
Man that's pretty slick bro. I've done the same sorta thing but one step further. Rip a 24 pin socket off an old motherboard glue it into the back of a project box and wire all your switches, posts, metering etc into that. Two advantages man, 1: Fried PSU? Unplug, toss, plug in new. 2: Even in my example where I have current limiting, 6 panel meters, etc. the break out box, takes up less space on me bench than the ATX metal case. On the other hand, two boxes is a little more cumbersome if you need to take it anywhere, but still, it's rare that it leaves the bench and a minor inconvenience compared to building again when it fries. I fry so many :/ Good build man, good vid.
I have a PSU with most power on the 3.3 wire (22A), but I have two rails for 12V (10A and 15A). Can I connect 12V rails together and get a total of 25A? And what dummy load resistance should it have?
There should be one purple wire 5 volt that's used for a standby always on great for USB Power and a light gray wire that I use for the power on, it tells me that everything checked out good so if that LED light goes out and it's still running, it's time to shut it down and investigate.
I can't seem to source a heak-sinked dummy resistor at the suggested resistance spec (5 ohm) for the 5v rail ( for an older Dell atx PS) I can find 10W .(point)5 ohm and 10W 10 Ohm and 10W 39 ohm.. on ebay.. Is a10 Ohm resistance going to work for me?
you added one side of the load resistor to yellow wire, what about the other end of the load resistor? to which wire it has been added? can you show a schematic diagram for the same.
i wonder if i could add trhis to my solar panels at the charge controler... to charge my batt bank.. controller is good for 30A ,,, charging off my generator ac
I would like to ask you would this work for running a car radio or a 12 volt mini air compressor? I just want to be able to listen to music in my workshop and blow up my lawn tractor tires etc when needed. Just not sure if it will supply enough amperage. Thanks for the video nice clean soldering and finished product.
Hello. I wanted to ask something. Please help with an answer. I am using an old PC Power Supply for my Turnigy Lipo battery charger. I have had the Charger connected to a battery (large one from a 4x4) and have a Car Battery Charger charging it at the same time. When I connect my LiPo I can charge at 6.0Amps. But, when I use the PC power supple and try charging my Lipo the only way i have been able to get it to charge my battery is if I have the supply current set to 2.5Amp, instead of the preferred 6.0A. Is this typical of using an old PC Power Supply? I would really like to be able to charge at a high setting if possible. What can i do (besides stop being a cheap-arse and go buy a better power supply. :P)?
Mario Baptiste Good question. You do not have to connect them all together. The amount of current a wire can safely carry is dependent on the length and diameter of the wire. If you bundle all of the wires together it allows you to safely transfer large amounts of current through your posts. If you want to multiple posts this is fine but be cautious with how much power you try to pull.
hi sir. why my power supply does not turn on without load ? i try connect to 12v led and turn it on again and it work. but if not loaded it not turn on? why ? and i check twice the yellow wire on my multimeter and it show only 10v but i connect 12v led and it work ! why ? sorry for bad english
i would like to have a 9-15V variable supply that can output 1-150A @ 12.5V. think one of these guys would work for that and if so how do i limit hte current?
6:55 While your at it, keep the distance between grounds and the other posts 19m/m (3⁄4 inch) so it can be used with a standard bunch of connectors...It is an industry standard.
Why did you solder the heatsink resistors in the yellow wire? it's a 12v..shouldn't it be on the red wire instead?, cause it's 5v and have more amps than 12v. I'm confused,, please explain.
Would this work to power police comunication equipment? Custom power supplies run at 13.8 V / 10 A but they work fine when plugged directly into cars batteries.
I got 2 yellow wires with a black stripe on it, it looks to be connected to a +12v2 on the board. what should i do with them? Also my highest current is 21A on my +3.3V?
Hi. Since you've got so many wires with the same colors, couldn't you make more of each voltage plugs and have multiple things that need the same voltage connected at the same time?
O.K., love this accept, were did you solder resistors too? There was nothing regarding the LED install. Green one installed between load of switch and ground I suppose. Red one????
I have an old computer PSU with outputs 3.3V (20A), 5V (20A), 12V (16A), and two negatives outputs -12V and -5V. I want to use it as a bench PS with 3.3V, 5V and 12V outputs. I think I will work mostly on 5V and 12V. Do I need to put dummy loads on both of those output? (5 Ohm for 5V and 22 Ohm for 12V). Thank you in advance for your kindness
Hello Anak, you likely have an older power supply. Place the dummy load resistor on the 5v line only and this will allow you to use the 3.3v and 5v and 12v lines. Good luck!
This is a great video. I am wanting to wire up a couple of railway wigwag lights in my garage. The bulbs are 12.8 volt, so why not hook them up? Right?? Great for the Man Cave and looks cool when someone comes in. I want to hook them up to my garage door opener. I bought the wigwag relay and the computer power supply, but now I wonder if I have enough power to operate the incandescent lights. The bulbs are 12.8 V and 26.9W. The power supply states that +12 has 16A. I don't know what the Watts are.
Iv just put all the 12v rails together and all the earths, when i connect the startup wire to ground (green) it turns on for half a second and then turns ff, it does this with an amp connected and with nothing, i dont have a load resistor could that be the reason?
hi, I dont know if you could help me , I,ve tried to do it with a Compaq psu series pdp-124p , and i'm unable to make it start. i'ave done everything shown in your video. green wire to ground , 5v to resistor to ground , 12v to resistor to ground , etc and it would still dont start. do you know if there something special to do with that model.
i did this to a new psu but when i hit the toggle switch for power, i get a flashing green led. the psu is a brand new 600w evga unit from best buy. what did i do wrong or what happened?
It may have been here, but why the resistor for the led? I will be using a 12v led as indicator lights with a newer power supply, Will I need the resistor on the lamp?
John Cantalupo it's always good to have a resistor on LEDs both to protect the device from the LED drawing too much current or to protect the LED from the supply. You can go without it but it's highly recommended as a precaution.
ok so i have a 450watt power supply NEW, it only porpose is to power 5 80mm computer fans and two 40mm fans, and two red LED's, i soddered the green and black wire together, the ATX power supply has a on/off switch built in, so when i turn that switch on, all the fans turn on but only for a minute then it shuts down, what else do i need to do?
Hi I don’t have a dummy load so I have tried to use 2 auto bulbs but power supply only turns on for half a second then cuts off ? Should this work or do I need the 10ohm load ?
Hello have another old dell power supply to convert. This power supp0ly have 2 rail on 12v. yellow wires and white wires.. can i put this 2 rail for making one 12 v out. thx..
Need more details on those resistors you installed on rear ofcthe unit otherwise this video is great , also there is a way to put some led lights next to 12,5 and 3.8v terminals as a indicator the power is there
So I got an old PSU which I know for sure works(i powered the PC it was in on before modding it) but after connecting all the stuff you mentioned, when i plug it in it just wheezes and does nothing(not even the 5v standby works). The wires are the right colors since they're labeled on the PSU case, I tried both 5W@2.2ohm and 10W@4.4ohm dummy loads on the 5V wire, and I still get nothing but wheezing. What could be the issue? Thanks a lot!
wil this run a 10 ohms 15 volt ac pyrograph pen master burn or a razer tip pyrograph so for i have asked three other people and have not gotten any answers can you help thanks some are videos with subtitles if you could help iwould be very greatful
i have a simple question... since my dummy load resistor will go on the 5v line.... does this mean i bundle all my 5v wires to the resistor or just take one 5v wire? and what do i solder/connect this resistor to? in other words one side gets the 5v line but where do i connect the other end of the resistor to?
Fennnnnnnnnnnnnntasticccccccccccccccccccccc Mate. On the same unit , can we have a variable low voltage Output with a Voltmeter Display ( anologue / Digital ) and followed by a safety Fuse , Please... !!
i don't know why but when i work with mine (i have two that work the same but different manufactures) and measure the voltage there is an actual 18v ±0.5v and i think its because 12v and 5v are connetcted together to the plug so if i do this i can can have it from 18 btw it's not written 18v i just have it
I built this but when I plug power in I get standby power but when I switch it on I get no main power. Also I tried removing switch and twisting green and grn wire together so I know it’s not the switch. Can anyone give me any troubleshooting advice please.
So I built this little project, but my voltages seem to be off. They're consistent, but seem to be double what they should be. I'm getting 26V, 11V, and 6.6V. Any ideas what might be going on? The PSUs I used are older units.
Great video. You might want to add a disclaimer. Reading through some of the comments/questions, it's quite obvious some people trying this are clueless about electricity and electronics. 12 volts is not going to electrocute anyone. But, at 20+ amps, you're going to get a heck of a burn. You are also exposing yourself to the household mains. Brushing across that will ruin your day.
That sped up laughter caught me off guard xD
Thank you for going in to more details, as most just fly right thru it. I particularly appreciated the standby mode. I have an older model but no main power switch that came with it. Without a main power switch, the one LED lite that came with it would stay on as soon as you plug the unit in and even when you connect a switch to green and black, the LED would stay on until you unplug the AC. The details you did go over in your video was enough to fill in all the little gaps I was experiencing on my mod!
You can use the -12v wire with the +12 and have 24v max and -5v, -3v
I know its an old comment but that will severly limit the current
I want to use a pc power supply to power my diesel heater which will use up to 10 to 15 amps to power the glow-plug
.
My power supply 12volt says it will put out up to 30 amps? So i just connect all the yellow wires to get that ip to 30 amp potential?
Great video can you please elaborate for a dummy like myself where to connect the dummy resistors
Nice easy conversion!
One change I would make is that instead of reserving a red wire for the Power On LED, I would use the grey wire. The grey wire is the Power OK confirmation signal to the PC, which also carries 5 volts but only after the unit is switched on AND the unit has performed a self-check. So, not only does it confirm that the power is ON, it also assures you that the unit is working properly and the voltages will be within reasonable expectations.
What if multiple 12v dc, 5v dc, and 3v dc? say 2-3 of each v.-power? OR does it need all yellow wire soldier together? I want to make a power supply for multiple Raspberry Pi projects used at one time.
When it comes to ATX with same curents at 12V and 5V lines
Do I need any resistor?
Could I build an External 800W AC-DC Power Brick from an ATX/SFX PSU following these steps? The project I have ongoing will be using a HDPLEX 800W DC-PSU to power a SFF AIO computer and it will need external AC Adapter(s). I was thinking I might get two Dell 330W Laptop Adapters but an ATX 800W converted to something like this might be much better.
I want to make this power supply mainly for 12volt supply but you mentioned the resistor on the 12 volt line.
How do I know if my power supply needs it? I’m not sure if mine is “old” or “new” as you put it.
Can you please show where you put load resistors, as you have already solded 12 volts to new terminal so please explain more.
Hi, i placed my load resistor at 12 Volt line. Characteristics, Load resistor: 15W 22Ω (i couldnt find at 10W), line: 12Volt, min: 0.3A, max: 18A. My load gets really hot, maybe is the normal hot i do not know, is it ok addind that resistor with that characteristics or should i add some an extra Silicone Ceramic Resistor? I attached the load at chassis adding thermal paste in order to make some heat get absorbed, is that ok?
Can you help me with something?
I built mine and connected -12v as negative and 12v for positive in the regulable exit. I used a DC motor for testing but the entire power supply shuts down at ±3V, what can I do?
great video. I also added a potentiometer on one of my 12v lines. Works great. I just blew one when I accidently touched another power lead to it.
how did you wired a potensiometer in that line and did you put a digital voltometer also?
I have an older ATX with 14 amps on the 3.3V line, 30amps on the 5V line and only 10 amps on the 12 V line
I used a 8ohm/50W resistor on the 5V line and when I connected a small cooling fan 12V/950milliamps the voltage drops to 11.05 volts why is this happening when the 12 volt line should handle upto 10 amps and stay stable
Please help me and reply
Thanks Dan
Great vid. Can you also explain to us where to hook up the LED's ? I am not a electrician and that info would be welcome. Thanks.
Hello where in the line you solder this load resistor i see they have 2 cable but they start from where and they go where?
A little fuse box inside mayde be handy incase something blow up. Than your stuff connected to the supply is protected
Most have a fuse in the connector for the mains power input. Cheers
I have a DC pump that I use for pumping oil. do you think I could use a computer power supply to run it? I figured since it hooks up to my 12v battery that it might work with the 12v power supply. it uses 13.5 amp. I have an old AT power supply that I want to try. it has an external on/off switch with a white, blue, brown and of course black for ground. wire harness has Black (ground), Yellow (12V), Red (5V), Orange (Power Good), Blue (-12V) and White (-5V) I believe. does this sound correct? do I need to put in resistors for an AT power supply? ty for your assistance. 🙂
hi.. thanks r making awesome video such as this one.. i am trying to make one similar.. everything works out fine when testing.. but when i put my +12v bundled wire to the binding post the atx wont start.. where does it go wrong?
Can I power the arduino from the 12v or 5v rail... But will the arduino can take that much of current
Hey. Can you explain why do you solder a resistor to 12v cable and where it goes? Please
Hi OK I do understand what’s the 12 V used for but I do not understand is Watt the 5 V can be used for and the 3 V watt it can be used for please explain thank you
Hello, I have done a DIY atx work bench supply unit. I successfully completed the project and was using the 12v line briefly. I finished and unplugged my ATX psu and sat it to the side. I return to use it again the same project as before and It doesn't turn on. I am getting a 5v from my standby. My Green is soldered to a ground.
I have completely take it back apart. Redone all the wires and checked my load resistor. My Brown wire is hooked to my orange, my grey is hooked to a resistor than to a ground. I have a 5v line hooked to a 10w 10ohm resistor. I am using fuses on all power lines also. They are still in working condition. SO after i do some doctoring and make sure all is well. I plug her in and nothing. But im getting my 5v standby. So its harnessing power and after turning it off you can tell the circuit is good simply because the meter will read 5v for a good min before SLOWLY dropping down. I have tested the other power leads with no luck. I thought maybe the fan was shot.
Any advice would be beneficial . Just looking for brainstorming ideas to tackle next. This is not my first atx mod either. I have built a few. Even using them to power Car amps for partys and etc..
have u fixed it yet? what is the grey wire used for? slowly dropping means that it is getting hot somewhere and thermally shutting down. what is the 5V standby?
So you can add a resistor to the 12v which is yellow
I know this is an older video, but on the Green wire. I’m needing to build 2 power supplies 12v dc only. I’ve seen videos that say to connect the Green to Gray. However I’ve seen more that say Green to any Black wire. Is this just a preference, or should it be one or the other for specific reasons?
I got a 750w power supply to run two 12" subs in my house. I need the yellows for +12v but what do I do with reds and orange? I'll only ever use it for this so can I just tape/cap them off? Do I need a resistor?
so iv been using one to power my subwoofer for a long time but i could never use it to its full potential. can i use two power supplies to power one amplifier? i think its a 2,000 watt amplifier and my subwoofer has a 1,400 watt peak. also i took all my car audio out of my car so im using my car stereo with that and i just dont know what the best way to do all that is haha i want the one subwoofer, two truck speakers and the stereo because its going to be for my theater and i dont want to spend all kinds of money when i have all this good car audio stuff laying around. haha how should i go about powering all this?? 3 cps's, one for each amplifier and one for stereo or what?
Why do u need another switch for the power and ground? Why not connect directly?
can connect the -12v to the +12v together ?and expect to have +12v on the post?
Great video. Much easier to follow than the other atx to power supply videos I watched. Maybe I missed it, I rewatched several times so I don’t believe I did, but you do not explain how to wire in the 2 LEDs. I assume standby is wired to the original on/off power switch and the master on light to the new master power switch? I’m no expert and don’t want to screw something up as we’re dealing with potentially fatal currents here. Any advice or an update would be appreciated. Also are the LEDs why you have 2 330ohm resistors listed in the parts list but don’t show them being used?
yeah I concur!
I have trouble with mine,when i bridge green and black... my supply turns on,and then shortly,off again... even with shunt still in place...
Any idea,what may cause this.. ??
Hopefuly you can sort it out.. why it is so.. 😊 so mine can funktion as well..
If I only want a 12V power supply, do I still have to have the load resistor on the yellow wires? I have no need for the 3.3v or 5v. I plan on shrink wrapping the 3.3v and 5v wires and stuffing them back in the case.
Amazing.. Great ideas👍
Can i use pyrography pen with this ,and how can i make variable voltages with this PSU
Hi again. I made my first one last year. It is from 1999 and shaped like a panini. Only 65 watts but it works without the load resistor. Also , it turned on without having to use a jump wire.
I`m ready to graduate on th project so I want to Make a second one from a 300w psu. I see you are putting the load resister between 2 yellow 12 v wires. Why not use the 5v wires? I dug up a lot of ceramic rectangular 5 and 10 w load resistors from old small TV's. Which one should I use and why? Can you explain the function of the resistor again? Anyone may reply, just means more knowledge transference!
the poer supply i have only has white gnd2 wire , red +52v wire, 3 black gnd1 wire ,3 yellow +12v wires ?
hello, I made a mistake of hooking up all the wires before testing the power supply to see if it was working is there a way to test the power supply to see if it is getting power...the fan doesn't even work?
Man that's pretty slick bro. I've done the same sorta thing but one step further. Rip a 24 pin socket off an old motherboard glue it into the back of a project box and wire all your switches, posts, metering etc into that. Two advantages man, 1: Fried PSU? Unplug, toss, plug in new. 2: Even in my example where I have current limiting, 6 panel meters, etc. the break out box, takes up less space on me bench than the ATX metal case.
On the other hand, two boxes is a little more cumbersome if you need to take it anywhere, but still, it's rare that it leaves the bench and a minor inconvenience compared to building again when it fries. I fry so many :/
Good build man, good vid.
I have a PSU with most power on the 3.3 wire (22A), but I have two rails for 12V (10A and 15A). Can I connect 12V rails together and get a total of 25A? And what dummy load resistance should it have?
What is the maximum current than can be drawn? I am asking as I have a 12v 10amp rated pump I need to power. Would this be possible?
There should be one purple wire 5 volt that's used for a standby always on great for USB Power and a light gray wire that I use for the power on, it tells me that everything checked out good so if that LED light goes out and it's still running, it's time to shut it down and investigate.
I can't seem to source a heak-sinked dummy resistor at the suggested resistance spec (5 ohm) for the 5v rail ( for an older Dell atx PS)
I can find 10W .(point)5 ohm and 10W 10 Ohm and 10W 39 ohm.. on ebay.. Is a10 Ohm resistance going to work for me?
you added one side of the load resistor to yellow wire, what about the other end of the load resistor? to which wire it has been added? can you show a schematic diagram for the same.
i wonder if i could add trhis to my solar panels at the charge controler... to charge my batt bank.. controller is good for 30A ,,, charging off my generator ac
I would like to ask you would this work for running a car radio or a 12 volt mini air compressor? I just want to be able to listen to music in my workshop and blow up my lawn tractor tires etc when needed. Just not sure if it will supply enough amperage. Thanks for the video nice clean soldering and finished product.
Check the power consumption of your mini compressor (in watts)
Hello. I wanted to ask something. Please help with an answer. I am using an old PC Power Supply for my Turnigy Lipo battery charger. I have had the Charger connected to a battery (large one from a 4x4) and have a Car Battery Charger charging it at the same time. When I connect my LiPo I can charge at 6.0Amps. But, when I use the PC power supple and try charging my Lipo the only way i have been able to get it to charge my battery is if I have the supply current set to 2.5Amp, instead of the preferred 6.0A. Is this typical of using an old PC Power Supply? I would really like to be able to charge at a high setting if possible. What can i do (besides stop being a cheap-arse and go buy a better power supply. :P)?
Where is the load resistor installed ?? Between where in the yellow wire
Can you explain why it is necessary to connect all the colored wire together respectively as opposed to having multiple 12-5v posts, please.
Mario Baptiste Good question. You do not have to connect them all together. The amount of current a wire can safely carry is dependent on the length and diameter of the wire. If you bundle all of the wires together it allows you to safely transfer large amounts of current through your posts. If you want to multiple posts this is fine but be cautious with how much power you try to pull.
The Recreational Engineer thank you
My power supply has a small button which I need push before it will work. How do I fix this?
hi sir. why my power supply does not turn on without load ? i try connect to 12v led and turn it on again and it work. but if not loaded it not turn on? why ? and i check twice the yellow wire on my multimeter and it show only 10v but i connect 12v led and it work ! why ? sorry for bad english
If you attach the dummy resistor, does it have to be connected to main line and ground or two main line wires?
Can I Get 13.3V by Combining Orange And Yellow Wires Without Causing Any Problem?
i would like to have a 9-15V variable supply that can output 1-150A @ 12.5V. think one of these guys would work for that and if so how do i limit hte current?
150A??? What do you wanna power up with that?... You would need an around 2000W power supply
what if i find some wires of other colors. How much load resistor should i use for old PSU (pentium 4 processor) ? Do i also have -12, -5 and -3.3V ?
6:55 While your at it, keep the distance between grounds and the other posts 19m/m (3⁄4 inch)
so it can be used with a standard bunch of connectors...It is an industry standard.
Why did you solder the heatsink resistors in the yellow wire? it's a 12v..shouldn't it be on the red wire instead?, cause it's 5v and have more amps than 12v. I'm confused,, please explain.
Would this work to power police comunication equipment? Custom power supplies run at 13.8 V / 10 A but they work fine when plugged directly into cars batteries.
Is it necessary to use all the red, orange, yellow & black wires?
I got 2 yellow wires with a black stripe on it, it looks to be connected to a +12v2 on the board. what should i do with them? Also my highest current is 21A on my +3.3V?
Will a 450W Raptor ATX work for this project?
What does one do if the power unit doesn't have a power switch? I just pulled the unit out of an old computer and it does not have a separate switch.
When you switch the green to the black wire (ground) wouldn't you be feeding 5V to the ground panel?
Hi. Since you've got so many wires with the same colors, couldn't you make more of each voltage plugs and have multiple things that need the same voltage connected at the same time?
Can we get variable voltage from 1.2 to 12 volts or more ?
O.K., love this accept, were did you solder resistors too? There was nothing regarding the LED install. Green one installed between load of switch and ground I suppose. Red one????
on mine the +5 is higher but it's 22 amps.
idk how to determine what ohms resistor I need.....
Is it really possible to convert atx computer power supply to charge car battery?
Can you connect the 12v and 3v to get 15v???.....or can you connect 2 power supply together to get double the A???
why you was able to bundle all the 5v lines for example all together? If I wanted to have multiple 5v lines could I have used an individual cable?
I have an old computer PSU with outputs 3.3V (20A), 5V (20A), 12V (16A), and two negatives outputs -12V and -5V. I want to use it as a bench PS with 3.3V, 5V and 12V outputs. I think I will work mostly on 5V and 12V. Do I need to put dummy loads on both of those output? (5 Ohm for 5V and 22 Ohm for 12V). Thank you in advance for your kindness
Hello Anak, you likely have an older power supply. Place the dummy load resistor on the 5v line only and this will allow you to use the 3.3v and 5v and 12v lines. Good luck!
Thank you for your quick response. It's very helpful. Please don't get bored if I ask something other time. Thank you
+Anak Agung Rai Surya Agung Surya No problem. I do my best to keep an eye on the comments.
This is a great video. I am wanting to wire up a couple of railway wigwag lights in my garage. The bulbs are 12.8 volt, so why not hook them up? Right?? Great for the Man Cave and looks cool when someone comes in. I want to hook them up to my garage door opener. I bought the wigwag relay and the computer power supply, but now I wonder if I have enough power to operate the incandescent lights. The bulbs are 12.8 V and 26.9W. The power supply states that +12 has 16A. I don't know what the Watts are.
My smps has 2005z chip. Working without power resistor connected between 5v and gnd. I want to increase output to 15v on 12v side.
Iv just put all the 12v rails together and all the earths, when i connect the startup wire to ground (green) it turns on for half a second and then turns ff, it does this with an amp connected and with nothing, i dont have a load resistor could that be the reason?
hi, I dont know if you could help me , I,ve tried to do it with a Compaq psu series pdp-124p , and i'm unable to make it start. i'ave done everything shown in your video. green wire to ground , 5v to resistor to ground , 12v to resistor to ground , etc and it would still dont start. do you know if there something special to do with that model.
i did this to a new psu but when i hit the toggle switch for power, i get a flashing green led. the psu is a brand new 600w evga unit from best buy. what did i do wrong or what happened?
Yeah i got a problem, how do you do this with a modular power supply
It may have been here, but why the resistor for the led? I will be using a 12v led as indicator lights with a newer power supply, Will I need the resistor on the lamp?
John Cantalupo it's always good to have a resistor on LEDs both to protect the device from the LED drawing too much current or to protect the LED from the supply. You can go without it but it's highly recommended as a precaution.
Nice stuff but why do you need an on/off switch, if the atx power supply already has one?
ok so i have a 450watt power supply NEW, it only porpose is to power 5 80mm computer fans and two 40mm fans, and two red LED's, i soddered the green and black wire together, the ATX power supply has a on/off switch built in, so when i turn that switch on, all the fans turn on but only for a minute then it shuts down, what else do i need to do?
Desmo Valve what does your wiring look like?
What do you do if you just want 12 volts
Hi I don’t have a dummy load so I have tried to use 2 auto bulbs but power supply only turns on for half a second then cuts off ? Should this work or do I need the 10ohm load ?
Is there only one 5v wire that connects to the dummy resistors and then to ground? It is unclear and any help would be great.
Zach L. One wire from the 5v line should be sufficient. You can use two if you want to be cautious
Hello have another old dell power supply to convert. This power supp0ly have 2 rail on 12v. yellow wires and white wires.. can i put this 2 rail for making one 12 v out. thx..
Need more details on those resistors you installed on rear ofcthe unit otherwise this video is great , also there is a way to put some led lights next to 12,5 and 3.8v terminals as a indicator the power is there
So I got an old PSU which I know for sure works(i powered the PC it was in on before modding it) but after connecting all the stuff you mentioned, when i plug it in it just wheezes and does nothing(not even the 5v standby works).
The wires are the right colors since they're labeled on the PSU case, I tried both 5W@2.2ohm and 10W@4.4ohm dummy loads on the 5V wire, and I still get nothing but wheezing.
What could be the issue? Thanks a lot!
I like how you made it simple to understand cause I have 2 or 3 of them lying around that I want to turn into a bench supply. keep up with the videos
wil this run a 10 ohms 15 volt ac pyrograph pen master burn or a razer tip pyrograph so for i have asked three other people and have not gotten any answers can you help thanks some are videos with subtitles if you could help iwould be very greatful
Would leaving a Molex Connectot conected not be a good idea as it is a commonly used power connector ? Just Saying is all.
where do you connect the resister to
Do i have to connect the load resistor to e.g. 5 V and ground?
Hi! Great video. Will try one of my power supply, I don't use anymore, from a Dinosaur computer. Thanks for sharing your gift. Stay safe.
i have a simple question... since my dummy load resistor will go on the 5v line.... does this mean i bundle all my 5v wires to the resistor or just take one 5v wire? and what do i solder/connect this resistor to? in other words one side gets the 5v line but where do i connect the other end of the resistor to?
F Balb only one wire to resistor from 5v other side to ground (black)
Fennnnnnnnnnnnnntasticccccccccccccccccccccc Mate.
On the same unit , can we have a variable low voltage Output with a Voltmeter Display ( anologue / Digital ) and followed by a safety Fuse , Please... !!
You just soldered the Load resistors in place but didn't show or say how and where to place them in the circuit. Will you please elaborate?
i don't know why but when i work with mine (i have two that work the same but different manufactures) and measure the voltage there is an actual 18v ±0.5v and i think its because 12v and 5v are connetcted together to the plug so if i do this i can can have it from 18 btw it's not written 18v i just have it
Can someone tell me what kind or brand of bannana plug he is using.
I built this but when I plug power in I get standby power but when I switch it on I get no main power. Also I tried removing switch and twisting green and grn wire together so I know it’s not the switch. Can anyone give me any troubleshooting advice please.
So I built this little project, but my voltages seem to be off. They're consistent, but seem to be double what they should be. I'm getting 26V, 11V, and 6.6V. Any ideas what might be going on? The PSUs I used are older units.
Hi ser can +12v run a car dc carbon brush
Motor for several hours?? Hapy to now