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El Cheapo 20A Lab Power Supply from ATX PC Supply Posted by: GeoN0JRJ
Video duration: 1149 seconds Global video hits: 14579 I decided to try and make a 12V, 5V, 3.3V DC power supply from the junk box. This is the result. Total cost under $5. I used a large load resistor to pull up the supply voltage and stabilize it. For a little more I could have added a voltage regulator. This one should run 10 amps all day long, max of 20A on 12v, 26A on 5v. That ought to charge your iphone! Related: atx, pc.power supply, 12v, 5v, 3v, lab, homebrew, diy, convert, ham, amateur, radio, pc, at, genesis, g50, n0jrj, iphone, iphone 4, iphone4, geon0jrj, george, kit, fan, power, supply, resistor, load Display Video Comments | Hide Video Comments | Add Comment |
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Video duration: 535 seconds Global video hits: 8761 Benefit for Yuko Sueta April 9, 2009, Brooklyn, NYC There is a second part, but it needs quite a bit of "image stabilization," which is something I can't do at the moment. However, I will get that up (as well as a third video) as soon as possible. Related: kayo, dot, toby, driver, yuko, sueta, coco66, mia, matsumiya, david, bodie, terran, olson, dan, means, tim, byrnes Display Video Comments | Hide Video Comments | Add Comment |
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Alan Grayson on the Budget: No More Bailouts Posted by: RepAlanGrayson
Video duration: 252 seconds Global video hits: 14665 Rep. Alan Grayson testifies before the Budget Committee on the President's budget. Rep. Grayson wants to make sure this budget meets human needs, does not raise taxes, and weeds out waste. Most importantly, he also opposes any money going to more bailouts for banks. Related: alan, grayson Display Video Comments | Hide Video Comments | Add Comment |
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engineered 2009 depression 1of2 explained by Richard C Cook Posted by: marcchabotyt
Video duration: 627 seconds Global video hits: 4461 Alex Jones interviews Richard C Cook about the economy recorded on March 3rd 2009 Related: glenn, beck, housing, crisis, economy, fox, news, paul, krugman, henry, ck, liu, president, barack, obama, tim, geithner, bailout, economic, depression, richard, cook, paulson, john, mccain, thomas, ferguson Display Video Comments | Hide Video Comments | Add Comment |
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Latest comments made on this video:
By: vsginaz. on 15 Apr 12, 16:45:05
Great video George! Best one I could find on converting a computer ATX to something usable, like RC charger power supply. Your video also included the 5v and 3.3v and your suggested USB port is priceless! You're obviously very? well versed around electricity. All the best!
By: preludefan. on 06 Apr 12, 19:37:09
dogs n? mother in law hahaha great vid friend!
By: GeoN0JRJ. on 06 Apr 12, 13:51:21
That? sounds like a great idea! Thanks for the comment and suggestion.
By: faffaflunkie. on 06 Apr 12, 04:46:49
You could just use a 12 volt automotive dome or side marker lamp in place of the power resistor. These are a lot easier to find than big power resistors these days. And some kind of? over voltage protection would be nice.
By: medicolas. on 21 Mar 12, 22:54:55
Thanks for the video! Would a 8 ohm 20w resistor work??
By: stayaninc. on 17 Mar 12, 04:13:33
Thanks for posting. I just built one myself to power my? 12 V appliances in my camper. Saved me a whole lotta coin!
By: dansw0rkshop. on 16 Mar 12, 19:44:46
Don't waste your time modding old PSU's. Make an adapter box, so that when the PSU stops working or for whatever reason you need to switch it out, your efforts? aren't lost. Check out my? video on the subject, "How NOT to convert ATX power supply..."
By: MrCinimod93. on 02 Mar 12, 06:16:14
nicer power supply than whats in my computer lol i have used an old 250w on my 25w? marine vhf radio works grate
By: GeoN0JRJ. on 15 Feb 12, 17:28:25
You can order them? from Mouser or digikey
By: GeoN0JRJ. on 10 Feb 12, 15:58:25
I have not tried that. I have seen some other PC pwr supply videos where they use a pot? to vary the voltage. Just make sure it can handle the current!
By: SebastiaanLP670. on 02 Feb 12, 20:54:55
I've a normal PC power supply, and I want to make a normal supply to get energy from. can you tell me? what I exactly need? So I can buy stuff in the stores? (like the types of resistors and stuff..) thanks!
By: GeoN0JRJ. on 14 Jan 12, 05:42:31
Sure. Try Mouser Electronics. They have all kinds of components. You might want to look at other plans for these power supplies and think about adding a 12v regulator IC. That way the load from an amp does not pull the voltage down. Watch the current draw from? the amp to be sure you do not exceed the current rating of the Power supply. Let me know how it goes! Thanks for the post!
By: m35a2lover. on 14 Jan 12, 05:06:43
i know you said you coulf run a transciever with that i have converted one for my cb radio and it works wonderful but i am however looking to get a new one with higher wattage i am going to add a very small linear amplifier and a frequency counter to my cb so i think the higher wattage will be better do you know where i could get a resistor similar to yours ??
By: DanFrederiksen. on 10 Jan 12, 20:48:53
good build. maybe smaller load? resistor would do as well (higher resistance) what would be really interesting is to make the supply variable
By: P1001AT2. on 04 Jan 12, 14:31:06
for anyone how is attempting this project and does not have a derivation of what wire is what just open the pcu follow the wires and it will tell which is which and also the wire? that turns on the pcu.
By: Imperiatus. on 29 Nov 11, 08:51:26
Loved the video! I'm going? to put one together myself!
By: tristan2668. on 15 Oct 11, 15:17:22
to get the orange 3.3V output working, all the orange have to be touching? Cause when I connect one orange to my dc motor then to the black ground wire, my psu turns off? ?!?!?!? I want 3.3V going into my dc motor.
By: GeoN0JRJ. on 17 Sep 11, 15:40:34
Well, it is rated at 34A with all the 12v supply lines in? parallel so I would say give it a try!
By: EwOkiE2. on 12 Sep 11, 12:36:53
If I get a PSU with these specs : +12V 34A +3.3V 28A +5V 30A -5V 0.3A -12V 0.8A +5VSB 3.0A Would this be ok for a 12v 10A Digital Tyre Inflator? ?
By: EwOkiE2. on 12 Sep 11, 10:31:15
Hi at 7 mins into the video you installed a resistor. Can you explain a? bit more is it a Red + wire and a Black - Wire connecting it.? Thanks..and excellent video!
By: xemphimtube. on 13 May 11, 10:05:42
you are a real GEM of? a gentleman! great advice and clear instructional video. Great man!
By: GeoN0JRJ. on 10 Mar 11, 03:28:55
Just a quick note that a large load, such as a transceiver, might pull the voltage down. I need to? check this out and see what happens. If it does I will replace the existing voltage regulator for 12v side with one that can handle the added load; say a 30A regulator. There was also an article in the May 2002 QST called "St. Louis Switcher" This might yield some good ideas. If anyone else has ideas please share!
By: GeoN0JRJ. on 09 Mar 11, 18:57:08
I have not done this but one way would be to? locate the Voltage reference chip on the secondary side of the Switching Power supply. Many of these supplies use a TL431 or similar chip. Once you find this, there should be a feedback resistor connected to one of the pins. In theory - I have not tried this so you are on your own - you should be able to connect across this resistor or remove and replace this resistor with a 1k potentiometer to adjust the voltage.
By: khancock70. on 09 Mar 11, 03:35:51
Sir, I actually have a few of? these power supplies. How would you add the potentiometer and the meter to vary the output?
By: mukerjea. on 08 Feb 11, 14:03:31
Excellent? advice for the power supply. In fact I was planning on buying one 12 volts power supply for one of my projects. You saved me some dollars. Thanks again.