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Old 09-28-2007, 08:24 AM
Jonathan Ott is offline
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Re: FrankenPower! Building a 12V Power Supply

Hey Mikey --

I know you are getting ready for Tuscon, but I'm wanting to buy a Frankenpower power-supply from you when you get back. Please PM me with details.

Have fun at TAS!!!

Jon
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Old 09-28-2007, 08:25 AM
Jonathan Ott is offline
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Re: FrankenPower! Building a 12V Power Supply

HEY!!! That was my 100th post! ^

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Old 09-28-2007, 12:44 PM
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Re: FrankenPower! Building a 12V Power Supply

My first PS conversion I used a PS with a clear plastic case like Mike. I had a problem getting it to work, untill someone posted about connecting the brown sensing wire to an orange wire. After that, it worked perfectly.
My next attempt was using an old PS with a metal case and I couldn't get it to work at all. I kept going over all the connections and every thing seemed right on. After many hours of head scratching and frustration I realized that the binding posts were grounding out on the metal case as they passed through it, so I enlarged the holes in the case. I then needed something to insulate the threaded metal posts as they passed through the case. What I did was to strip off a tiny bit of the silicon insulation off a piece of 14 gauge noodle wire and slip it over the post of the binding post. This insulated the part of the post that was comming in contact with the metal case of the PS and everything worked as it should. Since then I've made 3 more PS's and never looked back. One other thing that I 've done to increase the standing voltage of PS from the low 12's to just under 13 volts was to wire (2) 1 ohm 10 W resistors in series instead of using (1) 10 ohm 10 W resistor. A word of caution though, they get pretty hot so make sure you put them by the fan to cool them down.
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Old 12-13-2007, 12:27 AM
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Re: FrankenPower! Building a 12V Power Supply

Well here is my experience. Wired the green and black wires together, plugged in the power cord and the fan came on and stayed on. just under 12 volts on the output of the yellow wires. Added a nice plastic project box from radio shack to the side to hold the 4 sets of banana posts, an on and off switch with a red power light. No sandbar installed. Hooked up my TP1010c charger with a 4500ma lipo battery, Polly charge 4 with a 800ma and a 910ma battery, and radio quick charger all at once and seemed to charge with no problems! The only problem is the same as a few others where hooking up a charger after it is turned on, the power supply turns off. If all chargers are hooked up and than PS turned on, all works OK until you take a charger off. Sounds like another sensor wire by reading all posts. Just not sure about all the technical terms, etc. Works great, just inconvenient if all chargers are not connected. Which wires to connect? Any help would be great.
Any one use this PS?


Power supply is a NMB Model # MJPC-270A1
It is out of a Sony Vaio desktop

Rated at +12v 15a max (yellow wires) with a DC output total of 268.9 watts max

Should do the job fine, 1010c charger max is 10a output total, not sure of others. Any thoughts?


Thanks
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Old 12-13-2007, 09:47 AM
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Re: FrankenPower! Building a 12V Power Supply

Well my PS and the 2 other ones I built are still working flawlessly! took it up to the JR Indoor fest. and went nuts with 3 chargers all going at the same time on her. this has been one of the best projects i have done for my rc stuff!! here is a pic from the hotel at the Jr fest. yeah you have to remember to plug all the chargers in first but other than that, can't beat em!!
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Old 12-13-2007, 10:34 PM
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Re: FrankenPower! Building a 12V Power Supply

Quote:
Originally Posted by rcpilot82 View Post
yeah you have to remember to plug all the chargers in first but other than that, can't beat em!!
I figured out how to fix that. Add two 1000uf Capacitors in parallel with the 12v rail. Works great!!
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Old 12-14-2007, 05:43 AM
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Re: FrankenPower! Building a 12V Power Supply

cool deal man! I will have to do that.thanks for the update!
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Old 12-14-2007, 08:11 AM
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Re: FrankenPower! Building a 12V Power Supply

Mike Barbee builds a much better power supply.
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Old 12-14-2007, 10:42 AM
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Re: FrankenPower! Building a 12V Power Supply

Thanks Mike,

Not sure what you mean by the 12v rail? Can you show a picture or explain? What direction do the caps go? Sorry, my computer knowledge is limited.
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Old 12-14-2007, 10:50 AM
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Re: FrankenPower! Building a 12V Power Supply

Capacitors have polarity indicated on the wrapping. When I say 12V rail, I mean any of the 12V wires will work. Put a black wire on the Negative end of the cap, and a yellow wire on the positive end of the cap. Works like a charm. 1 1000UF cap wasn't enough, so I used two and that worked great.
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Old 12-14-2007, 01:36 PM
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Re: FrankenPower! Building a 12V Power Supply

One other thing that I 've done to increase the standing voltage of PS from the low 12's to just under 13 volts was to wire (2) 1 ohm 10 W resistors in series instead of using (1) 10 ohm 10 W resistor. A word of caution though, they get pretty hot so make sure you put them by the fan to cool them down.

heydick,
so instead of the one sandbar i would replace it with to in line to increase power output.mine is also in the low 12's and i would like it a bit higher
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Old 12-14-2007, 04:27 PM
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Re: FrankenPower! Building a 12V Power Supply

Yeah Ron, two sandbars of 1 Ohm 10 W each in series. I was searching the web and came across this mod to increase the voltage. The guy explained why but I can't remember, all I know is that it works. BTW, my PS is 650W.
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Old 12-14-2007, 07:33 PM
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Re: FrankenPower! Building a 12V Power Supply

My OFNA 18 amp variable power supply just went POOF!!!

Second power supply I've toastedin the last year, and 3 times as expensive as using the one listed in this thread.

Guess what I'm doing next week. . . . .
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Old 01-12-2008, 10:57 PM
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Re: FrankenPower! Building a 12V Power Supply

Mike,

Thanks Dude for starting this thread, I hadn't heard about it until today.
While at the field today I was talking with a few pilots about needing a power source for my cube so I didn't have to keep a battery in the shop for it. One of the guys told me about this thread so I had to check it out. Being in the IT field myself it wasn't hard to come up with a good power supply, I have already got everything on the power supply ready so I can hit Radio Shack in the morning to get the resistors and plugs. Thanks a million you have laid it out so well I don't think I will have any problem building it.
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Old 01-12-2008, 11:05 PM
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Re: FrankenPower! Building a 12V Power Supply

so instead of the one sandbarr just use two in the same place of the new value,good i will get them tomorow and let it hang out,thanks hhhhheeeeeeeeeeeyyyyyyyyy dick
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