DIY PC power supply for RC.........

[RH Customs]

Hey guys I wanted to see some pics and descriptions of DIY PC power supply for RC use. I have a little spare time soming up and several pc power supplies I have bought to use in customers computers. Thing is they are all Antec or Enermax 300-350 watts, so they are of no use since I only use 450 and up in the computers I build now.

Thanks
RH

[RH Customs]

Any Ideas or projects?

RH

[rczmjls]

I built one for myself this weekend.
I used a 350W power supply.
I don't know what info you need, but what you need is to use the yellow wires (+12 volt) and the black ones (ground). To power up the PS you need to ground the green wire.
If you can read french this is a good link: http://www.ni-cd.net/accusphp/chargeur/accessoires/alimentations.php.

Br,
Manuel

[kschauwe]

Any Ideas or projects?

RH
http://www.marcee.org/Articles/PCPowerSupply.htm
http://web2.murraystate.edu/andy.batts/ps/powersupply.htm

[evaderstman]

http://www.e-maxximumrc.com/html/power_supply.html

[RH Customs]

Ok I followed this sites, http://www.nfdc.net/home/cbdb/12%20V%20Power%20Supply.htm , now here I have some questions. I am running 2 10ohm 10 watt sandbars, and a 6 amp rocker switch (http://www.radioshack.com/product/index.jsp?productId=2062521&cp=&kw=rocker&parentPage=search ). Should I use a switch like this ( http://www.radioshack.com/product/index.jsp?productId=2062534&cp=&kw=rocker&parentPage=search )? Also when I measure my readings on my 12 volt section it is 12.05v, then when I start my charger is reads 11.85, is this normal. Any info on this is welcome.

Thanks
RH

[AudiTT-Quattro]

That's fine. Under load, the voltage is going to drop. As long as your charger can maintain the charge amperage without the supply voltage being too low, it's fine.

[RH Customs]

So is the 6 amp switch ok to use?

[kschauwe]

Use the 6amp switch. The other is rated only for 12volts.

[evaderstman]

Most chargers draw more than 6 amps i would look into a better switch. If you look on radioshacks website they have a lighted 12v 30 amp switch which should work great for you.

[kschauwe]

Depends on were you wire in the switch at:
1. 110vac input = High voltage, Low current.
2. "Power On" wire = Low voltage, Low current.
3. 12vdc output = Low voltage, High current.

[RH Customs]

Right know the power switch is wired to the power on switch ( green and then a black ( groud ).

[kschauwe]

Right know the power switch is wired to the power on switch ( green and then a black ( groud ).
Any switch will work then.

[RH Customs]

Also how do I disable the power reset?, because if I hook up a motor it power the motor then shuts off and back on and repeasts this cycle?

RH

[asw7576]

Also how do I disable the power reset?, because if I hook up a motor it power the motor then shuts off and back on and repeasts this cycle?

RH

Do you put some loads on +5V lines ? ATX PSU needs some loads ( big white resistors, 10 watts or 20 watts 10 OHM ) on +5V to make +12V ON.

[RH Customs]

I'm running a 10 watt-10 Ohm sandbar only running 1 of the of the 5 volt leads. Should I also put one on one of the 12v sides.

RH

[rczmjls]

I'm running a 10 watt-10 Ohm sandbar only running 1 of the of the 5 volt leads. Should I also put one on one of the 12v sides.

RH

Mine needed 20ohm/10W in the 12v. None in the 5v line (well, I put 10 ohm at the 5v line but it did nothing).
Please pay attention that 10ohm in the 12v line is more than 10W...

Regards.
Manuel

[RH Customs]

I'll have to try that, a 20ohm/10w on one of the 12v taps.

[evaderstman]

Hey RH i just got a dell supply that i will be moding to run my dtx ice. Just a question though, what did you do with your excess wires? Did you put a cap on them, or just cut them, and leave them?

[RH Customs]

Well I sortend all the wires I needed:

8 black:4 for 12v and 4 for 5v
4 yellow for 12+v
4 red for the 5+

and used a set of the red and black 2 run a led indicating it is on, and another set to hook up the resistor.

The rest of the wires I cut down and heat shrinked the ends and pinched the ends while the heat shrink was still hot to close it off.

But even doing a neat and tidy job I can't seem to get the thing to work right. Turns on fine then when I plug in my charger it turns off. So I am using the 10amp/13 max Integy power supply that has always worked great for me.

So is there anyone who can think of any other ideas to fix it this is the power supply I'm trying to work with, http://www.newegg.com/Product/Product.asp?Item=N82E16817103463 , any other ideas? If not I guess I will just have to use my Integy.

[AudiTT-Quattro]

It sounds to me like you're not loading the 5 volt rail enough. The supply current on the 12 volt rail is proportional to the five volt rail. I don't have time to read this whole thread right now, but try adding more power resistors in parallel on the 5 volt rail.

[rczmjls]

Turns on fine then when I plug in my charger it turns off. So I am using the 10amp/13 max Integy power supply that has always worked great for me.

So is there anyone who can think of any other ideas to fix it this is the power supply I'm trying to work with, http://www.newegg.com/Product/Product.asp?Item=N82E16817103463 , any other ideas? If not I guess I will just have to use my Integy.

Have you already tryed to charge the 12v line?
In mine, I had exactly the same problem. I bought two 10ohm/10W resistors. And tryed one on the 5v line (0.5A/2.5W) and then both in paralel (1A/5W). Since this didn't solve the problem I tryed both in series in the 12v line (0.6A/7.2W) and it worked.

Regards.
Manuel

[RH Customs]

Hmm that sound good, and no I have not tried loading the 12v side, when I have the time and after I try it I'll post what happens.

RH

[evaderstman]

Well i have mine coming along now since i got the parts today. I have four wires to each of the following the 5 volt positive, the 5 volt ground, the 12 volt positive, and the 12 volt ground. I am also using this switch which i just need to get to light up now. After that all i need to do is put some load on the 5 volt line, and then hook up the 12 volt brushless fan i got on clearance for 4.97(to provide more cooling for the resistors) and hope it all works.

[RH Customs]

Well I think I will have to give up on this project. I have tried different loads using 10ohm/10 watt resistors and even 50ohm/10watt resistors.

RH

[evaderstman]

Well i got mine working, i ran 3 10 watt 10 ohm 10% resistors on on the five volt line, and i get a 11.990 volt output so i think i will try four of them to get it over 12 volts. Maybe this will work for you? If it makes a difference i am running a 250 watt dell 14 amp power supply which i got for free. Anyway i will try to get some pics up tommorrow.

[evaderstman]

Hey Rh did you ever get your power supply working? Just out of curiosity i was wondering to see how it turned out.

[RH Customs]

Nope, I didn't. I guess I will be getting the Samlex/Radio Shack powers upply of the 28 amp Integy.I'm running the 10 amp/13.5 amp max Integy power supply the works great but I need more amps becuase when use the motor run in feature some motor pulls more amps than the power supply can put out. Also I want to get a second ICE charger ( Best Charger on the market under $300 in my opinon.

RH

[evaderstman]

I have an Ice to, and love it. If you give me some info on the supply i will see if i can help. For mine i ran 6 10watt/10ohm resistors in a parrallel, and they ran 190 degrees, but last night i install 6 50ohm/10watt resistors, and i get the same voltage, but they run about 80 degrees. Both resistor sets were cooled by a seperate fan too if it makes a difference.