Building a Supergun with -5v line

Xian Xi · May 15, 2007

I'm planning on making a component supergun but was wondering if anyone knows of a power supply that puts out around +5v@6A, +12v@1A and -5V@~1A?

I figure that I will be picking up different jamma boards to play but will also be getting a Hyper Neo 64 that requires the -5V line. Is it absolutely necessary?

Also would a PSU with the output of +5v@6A & +12v@1A suffice for most boards?

norton9478 · May 15, 2007

IIRC:

Neo Revision II does not require a -5v line.

I'd want a few more amps on the +5v line....

As for a PSU...

What's the specs of a 360 PSU?

Kickin' Wing · May 15, 2007

I have a Rev 2 Hyper-64 motherboard running on my supergun with a Jameco SC200 PSU (+5v@4A & +12v@1A) and I haven't had any problems.

-Kickin' Wing

FalcomAdol · May 15, 2007

I'm a big fan of PC PSUs.

Short the power on line, and you've got as much +5, -5, and +12 as you can eat.

Rengoku · May 15, 2007

PC PSUs are ugly
for look sake it's always better to stick with other psu models

Murray · May 15, 2007

There are ATX power supplies that are made small. A little modding and you'd be set.

*voltage regulator info removed because it was wrong*

bamarquez226 · May 15, 2007

Maybe this is more your style:

Sparkle

Xian Xi · May 15, 2007

norton9478 said:
IIRC:

Neo Revision II does not require a -5v line.

I'd want a few more amps on the +5v line....

As for a PSU...

What's the specs of a 360 PSU?

How can you tell the difference between the 2 boards? And on a rev 1 is it possible to just add stereo jacks instead of using the -5V line?

billd420 · May 15, 2007

Why not just get a real arcade PSU if you're interested in -5v? They're a bit bigger than say a Jameco PSU, but not that bigger than a PC PSU.

The price is also pretty good on them. If you're lucky, you can snag one for about $20 shipped. Also, you can be sure ALL jamma's will run no problem with it.

-Bill

norton9478 · May 15, 2007

billd420 said:
Why not just get a real arcade PSU if you're interested in -5v? They're a bit bigger than say a Jameco PSU, but not that bigger than a PC PSU.

The price is also pretty good on them. If you're lucky, you can snag one for about $20 shipped. Also, you can be sure ALL jamma's will run no problem with it.

-Bill

I think he's looking for a nexternal....

Arcade PSU's are pretty bad as an external unless you enclsoe them.

MKL · May 15, 2007

billd420 said:
Why not just get a real arcade PSU if you're interested in -5v? They're a bit bigger than say a Jameco PSU, but not that bigger than a PC PSU.

The problem with arcade PSUs, beside not looking nice, is that they have exposed terminals not only for DC but also for AC. It's not safe to have them around, they're meant to stay locked up as in cabs.

There exist desktop PSUs that are more powerful than those on Jameco and with -5v, they just cost a lot. BTW, Jameco doesn't seem to have the SC200 for sale anymore. The SW300 had already disappeared from their catalog.

billd420 · May 15, 2007

What if you were to close over the exposed terminals with say hot glue... would that stop the conductivity? I mean the other option for using an arcade PSU is to make a Mak-eque super gun thats super-sized...

MKL · May 15, 2007

Yes but then you have blobs of hot glue making the whole thing even more unsightly and if you need to replace the wiring it's going to be a real hassle. Much better to use those arcade PSUs in AT cases, happcontrols have them. Or just make a supergun with the PSU in it like the Sigmas which aren't much bigger than a minisupergun (same footprint more or less) and they're all in one box, no external units.

Neo Alec · May 15, 2007

Buy an arcade power supply. That will be the cheapest, and provide plenty of amps.

danox574 · May 15, 2007

I concur that an arcade supply is the best thing. If you need an external supply, build it into a small case. If you are feeling crazy, fit the whole Supergun in that case too. But if not, you'll still have an ideal supply.

-Dan

MKL · May 15, 2007

Well if you're housing a PSU into a case just remove the PSU's own case. I was sure this was common sense but the above pics prove me wrong...

danox574 · May 15, 2007

Hmm, after having the case open while building and testing over the course of a few weeks, and finding that the damn thing fits without the outer case pulled off (which is providing the convienent mounting flanges too, gone without the case), what exactly would be the logic in taking the case off now? Lighter weight for when I carried it concealed in the city?

My case is plastic, wouldn't the metal case provide some shielding as well, since it's sitting right next to my stereo and TV? Why do so many power supplies have that ghastly metal around them?

Enlighten us further please.

-Dan

Monolith · May 15, 2007

My friend builds and sells his Superguns in Pactec cases. He uses pc power supplies,and fits everything inside the case and includes a 80mm cooling fan with grill. His Sg kits support -5 volts.

Xian Xi · May 15, 2007

If you can consolize boards you can build superguns no problem.

Neo Alec · May 15, 2007

Is there actually money to be made building superguns? I would think the market is too small to make it worthwhile.

MKL · May 16, 2007

danox574 said:
Hmm, after having the case open while building and testing over the course of a few weeks, and finding that the damn thing fits without the outer case pulled off (which is providing the convienent mounting flanges too, gone without the case), what exactly would be the logic in taking the case off now?

What's the logic in taking off your coat when you're in your home?

segasonicfan · May 16, 2007

If you need a -5v line your best bet is probably to use a 7660 voltage converter.
See here

A 7905 as previously posted will not work, that is just a regulator. You need to actually convert the voltage. I find this to be the cheapest and easiest method.

The one drawback is the circuit can't output large loads...however, I know the older JAMMA boards just used the -5v for their audio amps (as most are dual supply), This might be the case with the Hyper Neo64 but I really don't know.

Good luck with the project,

-Segasonicfan

Murray · May 16, 2007

segasonicfan said:
A 7905 as previously posted will not work, that is just a regulator. You need to actually convert the voltage. I find this to be the cheapest and easiest method.

Thanks for the correction. I posted in here a while back asking if that's what I needed and never got a straight 100% "yes, that's it" answer and hadn't tried it yet. While I was pretty sure I had it (enough to post), I wasn't completely sure.

Neo Alec · May 16, 2007

segasonicfan said:
I know the older JAMMA boards just used the -5v for their audio amps (as most are dual supply), This might be the case with the Hyper Neo64 but I really don't know

The Hyper doesn't use -5v. Just +12 and a lot of +5 (the extra power cord for the revision 1 board is +5v).

I'm banking on the idea that some other boards I have use -5v just to get the game running, because I have a few that aren't working right now with the SW300 (or it's because that supply just doesn't provide enough amps). The games I can't run with my SW300 (which has no -5v) are Desert Assault, Karate Blazers, and possibly Hook.

segasonicfan · May 16, 2007

Thanks for the correction. I posted in here a while back asking if that's what I needed and never got a straight 100% "yes, that's it" answer and hadn't tried it yet. While I was pretty sure I had it (enough to post), I wasn't completely sure.

glad to help

I actually made the exact same mistake in the past b/c 7805s are so common and you think "ooh -5v just what I need!" Ah, electronics play tricks on you sometimes

The Hyper doesn't use -5v. Just +12 and a lot of +5 (the extra power cord for the revision 1 board is +5v).

I'm banking on the idea that some other boards I have use -5v just to get the game running, because I have a few that aren't working right now with the SW300 (or it's because that supply just doesn't provide enough amps). The games I can't run with my SW300 (which has no -5v) are Desert Assault, Karate Blazers, and possibly Hook.

Good to hear it doesn't need -5v, I did think that was weird. It sounds like your SC300 might not be connected properly. I can't image the -5v taking that much current as I'm quite sure it is only used for the audio amps.

-Segasonicfan

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