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01-26-2010, 08:29 PM
| #21 |
| Quarry Creeper Join Date: Aug 2009 Location: Philadelphia, PA
Posts: 352
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Just the other day I put a load of 8.33 amps or 100 watts @ 12 volts and it dropped .37 of a volt. From 12.15 to 11.78, so it could handle a full load (12amps) and not shut down the charger due to low voltage. So if you could get a voltage out of 12.1-12.5 volts by changing the resistor, you should be good to go. I only charge my nimh batteries at 1/2C any way, lipos aren't needed when you just bash.
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02-23-2010, 10:34 PM
| #22 |
| Newbie Join Date: Feb 2010 Location: Prairieville
Posts: 16
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i use a 250w supply and 8 cells (4 2 cells) at 7a i got 11.37v in pulling roughly 240w. works great!!
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03-09-2010, 03:41 PM
| #23 |
| Quarry Creeper Join Date: Aug 2009 Location: Philadelphia, PA
Posts: 352
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What is your idle voltage when not charging and what is the listed max amperage of the power supply at 12v? Last edited by racerfred; 03-09-2010 at 03:45 PM. Reason: addition |
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03-22-2010, 08:19 PM
| #24 |
| Rock Stacker Join Date: Feb 2010 Location: Race City(Mooresville)
Posts: 94
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i have a triton2. a have a really old ATX power supply but it's only 100w +12v@2A -12v@.3A +3.3v@6A 5v@10A. I am unsure if its gonna be powerful enough? can anyone help?
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03-23-2010, 08:06 AM
| #25 | |
| Rock Stacker Join Date: Feb 2010 Location: Race City(Mooresville)
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03-23-2010, 08:42 AM
| #26 |
| Rock Stacker Join Date: Dec 2006 Location: eaton
Posts: 80
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that is the same power supply i use for a triton jr it works ok but i need to try different risistor to get the voltage up it only has 11.48 volts but it has never shut off due to lack of voltage even when charging 5amps on a 5000mah lipo  |
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03-23-2010, 09:50 AM
| #27 | |
| Rock Stacker Join Date: Feb 2010 Location: Race City(Mooresville)
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03-23-2010, 02:01 PM
| #28 |
| Rock Stacker Join Date: Dec 2006 Location: eaton
Posts: 80
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It is 10watt 10ohm in the build so that is what I am using
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03-23-2010, 02:06 PM
| #29 | |
| Pebble Pounder Join Date: Jan 2010 Location: YYZ
Posts: 141
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That will not work, You have a really old 100W PSU and yet you are putting 100watts of load on 5v rail. Not a good idea. Just visit your local computer shop and ask for a cheapest ATX PSU. You can find cheap PSU for like $25~30 and it will like be 350W+. Besides, you want a higher Amps on the 12v rail. yeah, seriously that PSU you have isn't gonna work out too well. Last edited by xxgg; 03-23-2010 at 02:09 PM. | |
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03-23-2010, 10:07 PM
| #30 | |
| Rock Stacker Join Date: Feb 2010 Location: Race City(Mooresville)
Posts: 94
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yes, i know i could buy a better one, but i thought the the main concept was to make something from what you already had, if it don't power it properly then i will more than likely just buy a lab power supply...or maybe see if there is a local computer store that will give me a deal...thanks for the catch, you have me scared cause i have already tested it to see if it would run... it had 12+v so i think it will be ok as long as that bar resistor holds up? | |
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03-26-2010, 12:29 PM
| #31 | |
| Quarry Creeper Join Date: Aug 2009 Location: Philadelphia, PA
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03-27-2010, 12:05 AM
| #32 |
| Newbie Join Date: Feb 2010 Location: Prairieville
Posts: 16
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worked fine for me
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04-24-2010, 09:53 AM
| #33 |
| Newbie Join Date: Apr 2010 Location: USA
Posts: 29
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what is the best charger for the dollar - venom ?
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05-13-2010, 03:59 PM
| #34 |
| Rock Crawler Join Date: May 2010 Location: Calgary, Alberta, Canada
Posts: 771
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with my power supply i didn't wnat to spend money on a resistor and had a bunch of LED's laying around so i just made up a small circuit board with 10 leds on it to simulate a load for the 5v
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07-04-2010, 01:45 PM
| #35 |
| Newbie Join Date: Oct 2008 Location: Ontario,Can
Posts: 8
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I'm trying to build one of these.I couldn't find anywhere locally to buy the 10w 10ohm resistor but,a friend of mine who builds guitar amps gave me 2 5watt 12ohm resistors.Does anyone think these will work alright?
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07-15-2010, 03:34 PM
| #36 |
| Quarry Creeper Join Date: Aug 2009 Location: Philadelphia, PA
Posts: 352
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10 ohms at 10 watts is a starting point, imo. I go by my DVM. The only real way to figure out what resistor to use is to measure the voltage with a meter. If the voltage is too low, lower the value of the resistor. Don't over do it with trying to get a high +12, because it may over work the power supply. Bottom line, there is no telling which resistor to use because of the different manufactures designs. It's trial and error. You can find these resistors at Mouser.com http://www.mouser.com/ProductDetail/...QSGuZcvbhfM%3d |
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08-06-2010, 04:42 PM
| #37 | |
| Quarry Creeper Join Date: Aug 2009 Location: Philadelphia, PA
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09-06-2010, 06:38 PM
| #38 |
| Newbie Join Date: Jan 2008 Location: athens
Posts: 39
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nice write up! I know have to find a power supply to mod.
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09-23-2010, 07:26 AM
| #39 |
| Newbie Join Date: Apr 2008 Location: Papillion
Posts: 31
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Have fun converting a PC p/s. I have.
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10-24-2010, 11:38 PM
| #40 |
| Newbie Join Date: Jun 2010 Location: Mission viejo
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You guys got me on the hunt for a PC p/s !!! damn wish i hadnt trashed the old comps i had laying around...
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| Using a Computer Power Supply To Run a Charger - R/C Tech Forums | This thread | Refback | 10-05-2011 05:49 PM | |
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Linear Mode
