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PC Power Supply To Power CB Radio? Answered

I have a cb radio my uncle gave me 12v 2-4 amps.. I have an old computer with a power supply with lines for 12v 6amps and 12v 8amps. is there anyway I can get this to power my cb radio without blowing the thing? EDIT I forgot to mention, this is a mobile cb radio, I'm trying to run it in the house, which is why I wan't to use a pc power supply to run it....


I just did this recently actually, I took apart a spare computer power supply. I changed a couple of resistors inside that connect to the PWM controller and I managed to get it to output 13.55V which is much more suitable than 12V.

Usually these mobile stations are designed to run from the "running" voltage of a car which is in the range of 13.8V.

Which transistors and what values would i look for to do this...I know its old post but really could use the guidence

nvm I figured it out myself.. anyone else doing this with an old dell power supply from a p1/2/3 computer or you can't find the green wire do this.. 1. Jump the gray wire to any black 2. wire up a load aka something that'll use the juice like a cb radio for example 3. wire it up using the yellow (hot) and black (ground) and your set :) Enjoy, I take no responsibiltiy and am only posting this to save the trouble of anyone else wanting to do this. and yes its a high current device and if you havn't used it like this before it can be scarry I can safely say I was scarred to plug it in but now that I see it works and I havn't been shocked I'm fine... and I plan to get more power supplies for my powered subs, etc

i did this same thing to test a connex that i had gotten for free, the back lights didn't work but it receives and transmits fine. the power supply i was working with had a cord that ran to the front of the computer to a switch. i was prying the quick disconnects off the switch with a screw driver and i apparently forgot to unplug the thing. i got a good shock and reason to double check if things are unplugged. every thing still worked fine, though my fingers twitched a bit.

thats why i always short out any two wire, sometime b/c Im in the attic and dont feel like going down to the breaker box, yet also for lack of getting shocked


2 years ago

Is It ATX or other, If it is ATX than use the image I made. Short green to ground or put a switch on it to control when the unit is on. Yellow is + for 12v and balck is oviouly is ground.

ATX to Lab.png

I was going to go with that but my eyes fell on a UPS that had no battery i bought for 3 dollars and i'm like, hmmm ment to charge a 12v battery... turns out it works great and the CB fits into where the battery would go

Mine didnt work, I bundled all black and yellow together to get 12v, and my CB didnt recieve, it transmits and turns on, but no reception...is 12v enough?..could I use 13.3v?..

THE most inept spammer I've seen in a long time

Many years ago I used the power supply from my HO scale train set to power my mobile CB radio in my bedroom. I also had a mobile antenna mounted outside my window. (second floor) Needed a license to operate back then! Breaker one one!

if you can find a dell adp-220ab b power unit , cut the plug off (not the 13amp end )you are left with 3 white (12v +) and 3 black (earth) solder each 3 together , you now have a 12v 18 amp psu , to turn it on there is thin blue wire and a bare braded wire , you have to connect these to turn the psu on ,,

that is the pc that the psu is from but think it fits other dell pc`s

I run a KL400 linear amp with a converted PSU & it works fine, nice & cool, no overheating. The Transitter is working of it's own 12v power supply, I was dubious at first to rig it all up so I soldered a car fuse inline to the amp just in case. The power is working ok, no fluctuations & like I say, the PSU & the linear are near ice cold when running constant for hours of DX'ing at a time.

no big pops yet.

yeah, if you have any normal computer powersupply, it typically provides 5 and 12 volts. on a molex (4pin) connector, the red is +5v, yellow is +12v, and blacks are grounds for each (interchangeable ground for each +5 or +12, for the most part).
I actually use old computer PSU's as workbench DC power sources a lot, so i have experience with making them run without a motherboard. on the P1 connector (the big one that goes on your motherboard, normally has 20 to 24 pins), short the green wire with any black ground wire, and it'll turn on. Some power supplies are toggle on/off, meaning it will be on as long as green and black are shorted- when you remove the short, it will turn off. Other PSU's are momentary, meaning if you short them it'll turn on, and you can even remove the short and it'll stay on. Then, if you short it again, it'll turn off.

For powering devices, i like to grab old broken computer fans and snip the molex connectors (keeping as much wire as possible). Then, i solder whatever i'm powering to the appropriate 5 or 12v (yellow/red and black) wires. Now you can just plug the device into a molex coming out of the PSU, turn it on, and bam.

If you want to get fancy, like i have, you can even use a little toggle or momentary switch to short the green and black. Typically, i use an old salvaged case's power switch, snip the little connector at the end, strip the ends, and just secure them in the P1's green and black.


7 years ago

When the power supply says "12V 6A", it means it can output 12V at a maximum of 6 amps before overheating or blowing a fuse or something similar. If you use it to power a device that only needs 100mA, it will provide 100mA. The current it provides is determined by the power consumption of what it is powering, as as your CB needs less than 6A it will be fine.

As long as you can get the power supply to actually turn on while not in a computer (see the instructions others have posted) it will work fine.


7 years ago

I ve been using for long time old electric trollies bateries to power my Oobra 148gtl . I moded an ATX power supply and it olds 100%, still can charge te bateries with it. It can hold about 10 AMPS on 12 V DC. much better than any power supply for cb and less expensive.Very easy to mod.