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HomeAircraftHelicopterTools and Field Equipment › Best 12V power supply on a budget
11-06-2004 10:19 AM  13 years agoPost 21
alanhsu

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Vancouver, Canada

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Ramboy sold me a nice unit.

The price was so cheap at the time I actually bought two.

Each supplies 13 amp.
So two does 26amps together.
Meaning I got a 26amp powersupply for less than $40, cheapest anybody can find, make me feel I should have bought more unit.

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11-06-2004 01:10 PM  13 years agoPost 22
PaulH-MA

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Boston, MA

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You can pick up a 230W power supply for a PC for $40. The 12v rail should be able to supply around 9A. Linky:

http://www.pcpowercooling.com/produ.../index_econ.htm

This is the old-style AT power supply, so you don't need to short two pins to make it active. It will have a hard-wired switch to turn it on and off.

--Paul

TREX 450
Bergen Intrepid Gasser x2

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12-04-2004 02:14 PM  13 years agoPost 23
timid1

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NE WI, USA

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Grave Robber or Rooting around under stairs for old PC
Well now I have another Saturday project. Moving all the luggage out from under the stair well to find the carcus of the old pc. (grave robber skills) to remove power supply. Hehehehehe. Thanks guy!

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12-05-2004 05:22 AM  13 years agoPost 24
Euqor

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Balneario Camboriú, SC, Brazil

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I own a Pyramid PS-14KX Regulated 12V 14Amp Power Supply.

It cost $39.99 at Etronics.com.
It is very good, I would recommend it.

________
Wilson
Please visit my web page at: www.roqueaircraft.com.br

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12-08-2004 07:48 PM  13 years agoPost 25
wolfdad

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Southern Maryland

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The most versatle and reasonable I have seen are available from Radio Shack. I have two 10 amp and one 3 amp and, I think all three combined were less that a "C" note. They have banana type receptacles on the front so hook-up is a cinch. One thing I would caution you about regardless of which power supply you get and use, be sure you read the capacity on both your charger and the power supply. If you were using a Super Nova 250 and were hitting a battery at 4 amps on a 3 amp charger...guess what? It ain't gonna' work or it may work for a very short time.

wolfdad sends...

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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12-10-2004 03:30 AM  13 years agoPost 26
AS2003

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Elyria, Ohio

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Triton for my airsoft packs
Hi,
I've been reading many conflicting opinions about what power supply I need for the triton.

The thing is, the maximum I currently need to charge is only my 8 cell airsoft/rc car/tx/heli/lead acid packs, and I wondered what pyramid power supply would charge those.

The highest capacity I have is a 3300mah pack, and I wondered what the cheapest ps I could get (with Christmas coming up) and what rate that would allow me to charge the packs at.

Thanks very much for any help!

Summed up, would the 6 amp ps work?

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12-12-2004 12:02 AM  13 years agoPost 27
timid1

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NE WI, USA

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PC Power supply question
After reading and constructing a power unit out of old pc power supply, I note, with some distain, that the 12v feeds only produce 10.52 v. Am I missing something? Any suggestions. Tritton Charger does not like that low voltage.

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12-12-2004 12:09 AM  13 years agoPost 28
Greg McFadden

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Richland, WA

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is your 5V lead suitably loaded?

The silence often, of pure innocence persuades, when speaking fails

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12-12-2004 09:20 AM  13 years agoPost 29
Vigor3DFX

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Oakthorpe, Midlands, UK.

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Just to further that,
I use a 12v automotive bulb on my 5v rail,
The 5v is load sensitive and needs this to make the 12v work correctly.

the 12v bulb just "dims" on 5v and is enough to push the 12v rail from 10.7 to 12.8v

Tony

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12-12-2004 02:29 PM  13 years agoPost 30
timid1

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NE WI, USA

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Load
OK. Lets get a little more explaination going.

I have no loads on the output lines. I left all lines from the power assembly "as is" except for one plug which I cut to tap a twelve and five volt connection. (I thought it would be nice to have to power assembly useable for powering up pc stuff when I am tinkering, etc.)

Are you saying that only one five volt lead needs to have a load (of what) in order for the 12v to come up to its proper level. I have not heard of this before. Resistance is necessary or the other line in bleeding? This doesn't make sense to me. Appreciate the response.

Rick

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12-12-2004 03:28 PM  13 years agoPost 31
Greg McFadden

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Richland, WA

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it is a common thing. and I have seen it myself when I made one of these. the 5V/high amp lead needs to be loaded until the 12V lead comes up to where it should be.

As to it making sense, unless you or I are a designer of these well regulated power supplies we do not have the information or or even practical common sense to say whether something makes sense or not. This is a EE component which while many parts can be analized with a fluid motion analysis, when you get into active components much of that common sense crap breaks down, and you just have to deal with electricity being fundamentally strange. All we can say is that you have to do this to get the voltage on the 12V lead.

As far as the load magnitude, go with the lightbulb. I loaded mine with a 1 ohm 20W resistor and a 5V fan to cool said resistor. total current was ~5A on the 5V lead.

the other thing to keep in mind is that even though you may have a 300W power supply, you may only be able to get 140 W out of the 12V lead. the rest of the power goes to the 5V lead and a little bit to the -5V and -12V leads.

The silence often, of pure innocence persuades, when speaking fails

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12-12-2004 04:16 PM  13 years agoPost 32
timid1

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NE WI, USA

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Load 2
Greg

Thanks for the intellectual discussion. I had already put a load on by conecting to the old mother board and confirmed the voltage increase. I find this stuff facinating and have always tinkered with it. Wish I had pursued that education. By way of background to always tinkering, got knocked accross the room on my ass in the early 60's pulling tubes outta the tv and brushing the cathode ray tube. ZAP. YaHoo.

On my way to Radio Shack this morning. Not to buy their power pack. That's always a fall back. Its the tinkering that's provides the challenge and entertainment.

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12-12-2004 04:21 PM  13 years agoPost 33
Greg McFadden

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Richland, WA

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damn straight on the tinkering... I find active analog electronics fascinating (and frustrating). especially since you can get small quatities of many of the IC's one would want to play with for free from texas instruments and national semiconductor and other companies. especially fascinating is when you make something that should do one thing and it does something totally different.

have you gotten your hands on your own copy of the art of electronics?

it comes highly recommended.
http://www.amazon.com/exec/obidos/t...=books&n=507846

The silence often, of pure innocence persuades, when speaking fails

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12-12-2004 04:49 PM  13 years agoPost 34
Ace Dude

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USA

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As to it making sense, unless you or I are a designer of these well regulated power supplies we do not have the information or or even practical common sense to say whether something makes sense or not. This is a EE component which while many parts can be analized with a fluid motion analysis, when you get into active components much of that common sense crap breaks down, and you just have to deal with electricity being fundamentally strange. All we can say is that you have to do this to get the voltage on the 12V lead.
Nothing strange here. Real power supplies don't work like this.

The problem is that you're dealiing with a power supply who's primary design is to be a 5V supply. Providing 12V is its secondary feature. Essentially, you need to load the 5V rail so it the 12V rail will turn on.

As I said many posts ago get a real 13.8V Astron or similiar power supply and be done with it. I wouldn't run any of my chargers from a POS computer power supply. And, I only use PC Power & Cooling power supplies in my PCs.

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12-12-2004 05:27 PM  13 years agoPost 35
timid1

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NE WI, USA

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Load 3
Greg

Thanks. putting the book on my Christmas list.

ACE Dude

Thanks for the input, no pun intended.

Think I'll get the Radio Shack 25amp 13.8V just for grins. Maybe step down to the 15amp. Who knows, its the tinkering that's fun. As I said earlier.

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12-12-2004 06:09 PM  13 years agoPost 36
Drunk Monk

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Preston, UK

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I've used the PC12V power supply for the last 12 months with zero problems. I've not even needed to load the 5V line and according to my super nova the input voltage is 11.8V. You might call it a POS supply but it was free and that's always a bonus. If they can work on a computer that is a hell of a lot more sensitive than a battery charger then I'm more than happy to use it.


Stephen

I only open my mouth to change feet.....

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12-13-2004 02:29 AM  13 years agoPost 37
Ace Dude

rrProfessor

USA

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Think I'll get the Radio Shack 25amp 13.8V just for grins. Maybe step down to the 15amp. Who knows, its the tinkering that's fun. As I said earlier.
Sure the 25A my be overkill right now, but depending on how involved you get the the hobby the higher capacity can come in handy down the road in the event you need to power multiple chargers or charger a lot of cells at a high rate.

Some of the Schulze chargers can draw over 30A.

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HomeAircraftHelicopterTools and Field Equipment › Best 12V power supply on a budget
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