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Author Topic: Need help! How to get -5v out of newer ATX Power Supply's  (Read 1594 times)

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Savannan

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Need help! How to get -5v out of newer ATX Power Supply's
« on: September 23, 2011, 05:10:09 pm »
Hi all...

I need help...I picked up a cosair 600w power supply today for my multi-mk cab.   Everything was going good but I was looking at the Pinouts on the 24pin connector and it doesnt have -5v pin.  /cry   

I looked at wikipedia and found this
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Pin 20 (formerly −5V, white wire) is absent in current power supplies; it was optional in ATX and ATX12V ver. 1.2, and deleted as of ver. 1.3.

---------------------------------

Is there a mod that I can do get achieve -5v out of this power supply? Or would I have to buy a older P/S?

Thanks!!!!!

Sav
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BobA

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Re: Need help! How to get -5v out of newer ATX Power Supply's
« Reply #1 on: September 23, 2011, 06:30:48 pm »
You can use a -5v regulator to get 1A -5V from your -12V supply.

Google LM7905

 :D
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Thenasty

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Re: Need help! How to get -5v out of newer ATX Power Supply's
« Reply #2 on: September 23, 2011, 09:46:43 pm »
Quote from: Savannan on September 23, 2011, 05:10:09 pm

Or would I have to buy a older P/S?

Thanks!!!!!

Sav

No need to buy

http://forum.arcadecontrols.com/index.php?topic=101280.0

also in the FREE Section
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Thenasty's Arcademania Horizontal/Vertical setup.
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Franco B

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Re: Need help! How to get -5v out of newer ATX Power Supply's
« Reply #3 on: September 24, 2011, 04:46:00 am »
For Jamma boards that require -5v I have used a Negatron wired to a Jamma pass-through. It may not be the solution for you but its worth noting for reference.



 
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Savannan

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Re: Need help! How to get -5v out of newer ATX Power Supply's
« Reply #4 on: September 24, 2011, 10:17:49 am »
whta does that negatron do?
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Franco B

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Re: Need help! How to get -5v out of newer ATX Power Supply's
« Reply #5 on: September 24, 2011, 10:31:18 am »
Its a DC-DC convertor. You can input 4v to 14v and output -1.3v to -12v

I have the input wired to the 12v of the Jamma edge and the output set to -5v and wired to the -5v pin which provides 0.5A

I used it for games that require -5v for the audio amp as the PSU I had didn't supply -5v.

More details [here]
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Savannan

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Re: Need help! How to get -5v out of newer ATX Power Supply's
« Reply #6 on: September 24, 2011, 11:15:53 am »
Wow..it sounds like its the thing I need..
But just wondering if it will work if I soldered that to my main jamma harness...plugged it into my 6 in 1 switcher and ran a midway game....?  Hmmm...
It would suck If I need one of these per game.

Sav
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BobA

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Re: Need help! How to get -5v out of newer ATX Power Supply's
« Reply #7 on: September 24, 2011, 02:20:01 pm »
A negatron costs about $20 and if you need one for each board it is quite pricy.  An LM 7905 is about $2 and with the 2 caps needed comes in less than $3.
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Franco B

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Re: Need help! How to get -5v out of newer ATX Power Supply's
« Reply #8 on: September 24, 2011, 04:36:30 pm »
I don't suppose you could provide a wiring diagram/parts list for the LM 7905 solution could you BobA, I would love to see it.
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BobA

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Re: Need help! How to get -5v out of newer ATX Power Supply's
« Reply #9 on: September 25, 2011, 02:01:49 am »
Quote from: Franco B on September 24, 2011, 04:36:30 pm
I don't suppose you could provide a wiring diagram/parts list for the LM 7905 solution could you BobA, I would love to see it.

Here is the data sheet with sample circuit.
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