AT & ATX * Updated *Computer Power Supply Conversion to 12 volt field charger power supply  
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AT & ATX * Updated *Computer Power Supply Conversion to... - 2/21/2005 3:28:08 AM   
LostMyPlane



Posts: 127
Joined: 9/4/2004
From: Theodore, AL, USA
Status: offline 		I just updated the site on power supply conversions. Hope this answers a few questions.

After going to many different web sites and getting help from many different people here on RCU. I was successful in making a 12 Volt power supply to run my triton charger. Here is a link to my club web site with a lot of step by step pictures.

http://reckerclub.tripod.com/id105.html

< Message edited by LostMyPlane -- 2/25/2005 12:00:12 AM >

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RE: AT Computer Power Supply Conversion to 12 volt fiel... - 2/21/2005 3:29:46 AM   
LostMyPlane



Posts: 127
Joined: 9/4/2004
From: Theodore, AL, USA
Status: offline 		Here is a finished picture of it charging one of my lipos.

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RE: AT Computer Power Supply Conversion to 12 volt fie... - 2/21/2005 3:45:56 AM   
branded



Posts: 984
Joined: 7/16/2002
From: cary, IL, USA
Status: offline 		Nice job...You can also get detailed instructions on to convert AT powersupplies as well as ATX supplies at Red Sholefiied's site...

http://www.rcbatteryclinic.com/

(in reply to LostMyPlane)
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RE: AT Computer Power Supply Conversion to 12 volt fie... - 2/21/2005 3:55:57 AM   
LostMyPlane



Posts: 127
Joined: 9/4/2004
From: Theodore, AL, USA
Status: offline 		I got a lot of great information from his and other sites. There sites are real text base which is great. I wanted to make more of a picture by picture how to. Thought that might be helpful. I plan on doing one on ATX next.

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RE: AT Computer Power Supply Conversion to 12 volt fie... - 2/22/2005 10:07:14 AM   
ragbag


 

Posts: 66
Joined: 6/26/2003
From: gainesville, FL, USA
Status: offline 		Red hasn't updated his instructions lately.

We are taking the 5 volt lead and bringing it out also.
Use the same negative post on the out side and add a 5 volt positive post.

Use which ever voltage you need. I marked mine with a black sharpie and then put a strip of clear tape over it.
Break in brush motor, verify rotation of motor and other ways that a low voltage could be used.

George
Gainesville fl

RAGBAG

After I posted this I went into your site. I see that you didn't put the load in. If the load is not put in the power supply will not put out the amperage that is marked on the manufactures label.

We use these to run all types of chargers and you need the load to get the amperage. I have a Pyramid that I paid $40 for that is nice. The PC power supply does everything the Pyramid does and with the Radio Shack posts and the auto light socket #1157 taillight bulb,and a whole lot of fun building, it cost me $5.00.
The power supply was free.
RAGBAG

< Message edited by ragbag -- 2/22/2005 10:22:27 AM >

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RE: AT Computer Power Supply Conversion to 12 volt fie... - 2/22/2005 6:33:08 PM   
branded



Posts: 984
Joined: 7/16/2002
From: cary, IL, USA
Status: offline 		Well here's some more to look for that could cause some problems....

On my switcher (ATX) there's a remote sense for the 3.3 logic supply. It just happens to have a orange and a black wire but they are not common to the other orange (3.3v outputs). They are marked seperately on the pc board and the Sense Orange wire should be tied to at least one of the bundled orange wires, and the Sense black lead should be tied to all (or some of the black return leads if you're not using them) the bundled black ground leads. If not, then your supply will sometimes kick offline upon startup.
The load isn't necessary on all switchers, it depends on the design of the supply.

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RE: AT Computer Power Supply Conversion to 12 volt fie... - 2/22/2005 7:10:31 PM   
LostMyPlane



Posts: 127
Joined: 9/4/2004
From: Theodore, AL, USA
Status: offline 		I didn't put a load resister on this one.Being one of the older AT pwr PS it works fine for. low power needs. The next mod I'm doing on a ATX power supply will show me putting some resisters in.

< Message edited by LostMyPlane -- 2/22/2005 7:14:24 PM >

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RE: AT Computer Power Supply Conversion to 12 volt fie... - 2/22/2005 10:33:00 PM   
bensenvill


 

Posts: 3
Joined: 11/20/2002
From: WI
Status: offline 		wow I was just working on this conversion myself
heres the site I was using
http://www.nfdc.net/home/cbdb/12%20V%20Power%20Supply.htm

Anyways I'm an idiot with electricity and I was hoping someone could answer a quick question before I fry some circuits.

So heres the deal, I'm using my ATX PSU as a REPLACEMENT for the batteries. I have the PSU running my 12V speed controller, now I want to eliminate the battery for my reciever [JR R700]. The battery is 4.8V. Can I simply replace that with the 5V source????

[edit... wow, I've been reading this site for over 2 years but didnt realize this was my first post]

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RE: AT Computer Power Supply Conversion to 12 volt fie... - 2/22/2005 11:33:17 PM   
branded



Posts: 984
Joined: 7/16/2002
From: cary, IL, USA
Status: offline 		Yes....

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RE: AT Computer Power Supply Conversion to 12 volt fie... - 2/23/2005 12:09:54 AM   
bensenvill


 

Posts: 3
Joined: 11/20/2002
From: WI
Status: offline
quote:

ORIGINAL: branded

Yes....


sweet it works.

ok, one battery remains... what can I do about the transmitter battery? [its a JR, battery says 9.6]. Will it handle 12V, or is there a way I can rig 10V?

[I appreciate it guys, I just want to make sure I'm not going to break anything]

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RE: AT Computer Power Supply Conversion to 12 volt fie... - 2/23/2005 4:25:24 AM   
Andrew


 

Posts: 1893
Joined: 2/4/2003
From: Murray, KY,
Status: offline
quote:

ORIGINAL: bensenvill

or is there a way I can rig 10V?



Here is a nice simple 12v to ? converter -- the circuit is stable and adjustable. The module can be constructed on perf board and mounted internally with an external binding post. Use a 5K trimmer pot to set your voltage to 9.6 before boxing it up.

Unless you're getting 12+ v on the rail, you might want to substitute a LDO regulator for the LM317T, perhaps an LT1085CT, AP1086T, LM1086CTADJ or AP1117T.

andrew

< Message edited by Andrew -- 2/23/2005 5:01:12 AM >

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RE: AT Computer Power Supply Conversion to 12 volt fie... - 2/23/2005 4:54:49 AM   
branded



Posts: 984
Joined: 7/16/2002
From: cary, IL, USA
Status: offline 		Go to Radio shack and purchase 3ea. 1n4000, or 1n4001, or 1n4002, or 1n4003, or 1n4004 , or any 1 to 3 amp silicon rectifiers.......

It should cost less than 2 bucks...... DO NOT PURCHASE SCHOTTKY RECTIFIERS as they have a lower series voltage drop. You want a silcon rectifier in the range of 1 amp to 3 amps.....

Put three in series. Each rectifier will provide a stable voltage drop of .6~.7 volt dc. Wire these in series with your 12 volts and viola, you have 10 volts!

The series connections would be: (follow the package illustration for clarification) Diode1-anode to Diode2-cathode to Diode3-anode.

You cab surround the three diodes with a piece of heat shrink tubing.

Now connect Diode3-anode to you transmitter battery connector positive terminal. Connect Diode1-anode to the positive 12 volt supply. Connect the 12 volt return (negative) to the transmitter battery negative input.

Viloa, you now have a stable 10 volt source.

< Message edited by branded -- 2/23/2005 5:06:54 AM >

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RE: AT Computer Power Supply Conversion to 12 volt fie... - 2/23/2005 3:41:59 PM   
bensenvill


 

Posts: 3
Joined: 11/20/2002
From: WI
Status: offline 		andrew and branded, thank you.... I'll have alot of use for voltage reduction in the future, but after sleeping on it for a night, I think I can just use the 12V supply for the receiver.

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RE: AT Computer Power Supply Conversion to 12 volt fie... - 2/24/2005 11:57:59 PM   
LostMyPlane



Posts: 127
Joined: 9/4/2004
From: Theodore, AL, USA
Status: offline 		I just updated the site because of the questions some were asking about the use of resistors and about ATX equipment. hope this helps

http://reckerclub.tripod.com/id105.html

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RE: AT Computer Power Supply Conversion to 12 volt fie... - 3/14/2005 5:33:37 PM   
F106A



Posts: 1456
Joined: 4/13/2002
From: Clifton, NJ, USA
Status: offline 		Hi,
I tried to convert a PS and can't get 12V. It's an ATX and the yellow is 8.12 V, the red about 3.8 V. When I put a 12v bulb in series between red and ground, the voltage goes to 8.6. I have a feeling the PS is shot, or am I doing something wrong?
Thanks,
Jon

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       Post #: 15

RE: AT Computer Power Supply Conversion to 12 volt fie... - 3/22/2005 9:24:13 PM   
jfv61


 

Posts: 13
Joined: 3/14/2005
From: Austin, TX, USA
Status: offlin