New question about supergun on-switch w/ 8 pin din.....question at bottom (12-29-03)

NGT · Dec 27, 2003

I'm sure nobody cares...but I am bored........

I used a regular 4 pin mini-din (s-video) which will hook up into the supergun that it will be attached to...

1. -5v
2. +5v
3. +12v
4. Ground

and there's a fan in there

VERY TIGHT SQUEEZE!!!! lol......

I wanted to use the regular 5 pin din, but they were out of the male to male cables....so I went this way instead...

Sure it's big...... but what-cha think anyways?

IMO, it will look nice next to an external black plastic A/V box with a FLAT supergun center console, which an atomiswave can rest upon very nicely

Like I said, I was bored,lol........

MKL · Dec 27, 2003

So you're using a S-Video cable for power? The wires in those cables have an extremely small gauge, 26AWG or 22AWG *at best* and you have only one for each rail. I don't think I can stress enough how bad this idea is...

and are you serious about the fan inside an unvented (!!) case? Do you have any clue how cooling fans are supposed to work? Bleh...

NGT · Dec 27, 2003

SO...... what would you suggest?

1: make my own S-video cable with 18 guage wire? (would take about 5 minutes....w/ parts)

still not sure about this "rail" thing....but the other powersupplies I use only have one pin for each voltage...

2: set up the fan with some vents (I was thinking about this, but figured air circulation would be enough....guess not) Vents are easy enough to get in there....as all I need to do is cut the hole and get the vent cover. Would you suggext vents on each side, or would one on the top be enough? Or one on the top and one on one side?

anything else?

instead of just talking shit...maybe a suggestion or two on fixing this would be a little bit more helpful.... :spock:

Yodd · Dec 27, 2003

NGT said:
instead of just talking shit...maybe a suggestion or two on fixing this would be a little bit more helpful....

I would start by adding some ventilation holes to that case. If it can't move cool air around inside that case, then at best its circulating hot air, which is a bad thing. Without external air entering the case, it probably isn't circulating much anything.

I also agree with MKL that using a s-video cable for power is a bad thing. I would suggest using at least 18 gauge wire all around and maybe remove that 4 pin mini-din s-video connector and use a 5 pin din...that way the pins are a little larger and you can then use 2 ground pins.

What kind of PSU is inside it? Arcade psu?

norton9478 · Dec 28, 2003

I have been working on bulding an external psu. I am going to use that naomi capable PSU that you have. My plan is to use a 6 or 8 pin cable so I can have the power switch on the console.

NGT · Dec 28, 2003

remove that 4 pin mini-din s-video connector and use a 5 pin din...that way the pins are a little larger and you can then use 2 ground pins.

Is the 4 pin bad because of only 4 pins or the size of the actual pins going through the plug? would 18 guage wire make keeping the 4 pin sockets ok?

Would it be possible to leave the 4 pin mini-din S. video connector, make my own 18 guage 4 wire cable....

then use those...

... plastic things with the screws on top, that are used to split wires etc... (sorry, I don't know the exact name)...

... it's to have more pins etc...?

As for the vents.... would just one vent with a van pulling air in be enough? or should I have one pulling air in and one blowing air out?

Yodd · Dec 28, 2003

NGT said:
Is the 4 pin bad because of only 4 pins or the size of the actual pins going through the plug? would 18 guage wire make keeping the 4 pin sockets ok?

Both. The pins on a s-video socket aren't designed to handle that kinda of current running through them. A 5 or 8 pin din connector should be heavier duty plus allow you to have multiple connections for ground and +5.

Would it be possible to leave the 4 pin mini-din S. video connector, make my own 18 guage 4 wire cable....

then use those...

... plastic things with the screws on top, that are used to split wires etc... (sorry, I don't know the exact name)...

... it's to have more pins etc...?

I suppose you could do that, but really those pins and connectors aren't intended for that kinda of current going through them. With the amount of current most Jamma boards can pull, I can imagine you would run into some problems pretty quick.

As for the vents.... would just one vent with a van pulling air in be enough? or should I have one pulling air in and one blowing air out?

If you have room, I would have one fan pulling air out, and a series of ventilation holes (maybe on the side of the case?) allowing cool air to enter near the PSU. Think of this as you would if you were trying to increase airflow into and out of your PC. A hole with a fan isn't enough; cool air still has to be able to get inside.

Might want to check with your PSU to see if has any specs for cooling. Some mention force air cooling specs. And if its a PC psu inside, then you certainly need to have a fan pulling air OUT.

NGT · Dec 28, 2003

--So......Go for a 5 pin din....w/ 5 pin din male to male cable....

Can I still use those plastic things with the screws to split wires to get more access to get more out of the 5 pin socket?

--have a fan pulling air out and vents for air to come in.....

would it be ok to have one fan blowing in and one pulling out? But have them both on the top of the powersupply?

or should is be a fan pulling out on top and vents on the sides of the other end?

or would both of these be ok?

MKL · Dec 28, 2003

NGT said:
--So......Go for a 5 pin din....w/ 5 pin din male to male cable....

I really don't understand why you want to have a cable plug on the PSU? Wouldn't it be better to have the power cable coming out of the PSU enclosure without any plug?

NGT · Dec 28, 2003

Wouldn't it be better to have the power cable coming out of the PSU enclosure without any plug?

Why does it matter? seriously....I want to know...
what changes with the power running through a 5 pin din cable?
will it not be strong enough for the pcb? I basically only did it this way for convenience and to get around making the cord myself...

but it's not a big deal to get some wire and make my own....

MKL · Dec 28, 2003

NGT said:
Why does it matter? seriously....I want to know...
what changes with the power running through a 5 pin din cable?

Well, not having to install a plug makes your life easier to begin with. If you really want to have a plug, more power to you but note that 5 pins are not enough because you'll end up using just one wire for +5v and 2 for ground or vice versa. it would be better to go with an 8-pin plug (3 grounds, 3 +5v, 1 +12v, 1 -5v).

NGT · Dec 28, 2003

would it be ok to send one +5 and one ground across and then split them on the other end with one or two of these?

just wondering....

and trying to prevent as much backtracking as possible....

MKL · Dec 28, 2003

Let's put it this way: the longer the single-wire segment, the worse. So running a single wire and splitting it into 3 or 4 wires very close to the jamma connector is not a good idea. Keep the single wire length to a minimum.

NGT · Dec 28, 2003

got-cha......

thanks!

8pin din it is.....and vents on the back/sides with a fan pulling air out on top....

anything else you think I should keep in mind while fixing this?

RiotoftheBlood · Dec 28, 2003

I don't know... are you guys sure that even a standard 8-pin DIN cable would be enough? I don't know what gauge ire is used in the cable, but we're talking as much as maybe 10 amps for the grounds... even if he uses 3 of the wires for grounds... and what about the pins on the DIN connectors themselves? Can they handle that kind of current?

Electroman · Dec 28, 2003

I would go with 16 AWG wire for this. Also for power I'd suggest coaxial power ports, like we see used on DC power couplings on game systems.

Using small wire like that is gonna drop some voltage across the cable.

Power in watts= (Voltage drop squared)/Resistance of the wire/connectors.

Arakon · Dec 28, 2003

I've powered a single slot MVS with a s-video style connector and thin wires just fine. multislots and other PCBs will likely need more power, tho. thicker wires and a normal din plug will do.. the jamenco PSU uses one as well, and can power even multislots fine.

NGT · Dec 28, 2003

why can the sc200 use a 5 pin din then?

(edit----that's what I was thinking)

I think I am going with the 8pin Din and homemade cable with 18 gauge wire...

Yodd · Dec 28, 2003

NGT said:
why can the sc200 use a 5 pin din then?

Cause it can only supply 4 amps at the most on the +5 and a regular 5 pin din seems to handle it fine.

NGT · Dec 29, 2003

So....looks like I have some re-thinking to do

maybe molex? lol

NGT · Dec 29, 2003

So, if I use an eight pin din socket on the supergun...

And have three grounds and three +5v's..... along with a one +12v and one -5v......

How the hell do I make a power switch on the supergun?

5pst? lol....

MKL · Dec 29, 2003

Better make an AC switch on the PSU.

NGT · Dec 29, 2003

So forget about the on switch on the supergun and stick with just using the switch below in the picture? Is this what you're talking about? If so, it would save me some time.......

RiotoftheBlood · Dec 29, 2003

This is kind of off-topic... but since NGT brought it up... I'm curious as to why some of you use the power switch on the DC side of the supply? With that, you're keeping the supply running (assuming the AC input is still ive) with the outputs open, and I know the supply I use specifically says that it should be loaded while on... I'm not sure if that applies to all rails or not, but I use a 10-ohm high-power resistor across the -5V rail just in case, which drops half the capacity (0.5 A) just to be safe...

NGT · Dec 29, 2003

sorry....im a rookie...

Would you mind explaining that stuff began in a little easier to follow terms.....which side is that switch on in my pic??

ac or dc?

where else do you think I need a switch?

suggestions?

New question about supergun on-switch w/ 8 pin din.....question at bottom (12-29-03)

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