Sh*t. I'm going to build a supergun, aren't I?

[bartre]

okay, so as to the power, does this plan work?


For the audio attenuation circuit, it says to use a DPST switch, which is really confusing me.
what exactly does it do? how?

[SignOfZeta]

You don't really have to worry about making diagrams and stuff, assigning them to pins. If you buy a harness from a place like http://www.jammaboards.com they are all labeled and even have the exact terminals you need to connect them to their power supply.

[bartre]

well thanks for that, zeta; just like to be thorough though.
I think this is what i'm going to use for the core part of my Supergun:
PSU - http://www.ebay.com/itm/ARCADE-CHERRY-MASTER-used-11-AMP-Peter-Chou-POWER-SUPPLY-5-12-5-Multicade-/221183595634?pt=LH_DefaultDomain_0&hash=item337f91d472

Video encoder - J-rok

Harness - was just going to buy the one off jammaboards.com but is there any real difference between Jamma and Jamma+?

Case - slab of wood for now, will upgrade to a nicer project box at some point

misc. other parts:
http://www.jammaboards.com/store/power-emi-filter-with-built-in-switch-emi-pf06g.html
http://www.ebay.com/itm/2-Pack-DB15-Female-d-sub-Solder-Cup-Connector-New-17209-/390530429075?pt=LH_DefaultDomain_0&hash=item5aed6d7093
http://www.ebay.com/itm/Lot-of-2-DB15-Male-solder-cups-and-metalized-plastic-hoods-17010-17208-/160965854861?pt=LH_DefaultDomain_0&hash=item257a50068d
along with some varied switches and buttons

[Tatsujin]

I made my first supergun without the internetz, there was a simple harness explanation in one of our german game mags back in 1992 or so, that I used as a reference. first try and it worked like boss

[bust3dstr8]

okay, so as to the power, does this plan work?


For the audio attenuation circuit, it says to use a DPST switch, which is really confusing me.
what exactly does it do? how?

It just switches between straight audio and attenuated audio.
The sound setup doesn't need the switch, you can design it to what suits you.

[majors]

I made a supergun once. I had an old metal case for some science equipment that I thought would convert nice. The idea was to have a all-in-one design. Controls and sound with an enclosure to hold boards.




After getting more cabs, this was moot. I have raped it for parts over the years but I still have the old jrok composite/s-vid encoder that I no longer need. JAMMA is pretty simple, it's all direct connections. I have seen all sorts of crazy supergun setups on the internets, some are TINY using an external power supply.

[bartre]

gah, I'm an idiot.
I should have just gone for the BIN on ebay, but the PSU went for close to $35 or something, i stopped caring after $25.
so i do a little more searching, and find a local company that specializes in that amusement repair.
whaddaya know, $25.

once the encoder gets here, i can get started for reals.

[bartre]

OF COURSE!
I get to the place to give them my money for the PSU, and they change their mind, they want $45!
I pass that up, get home, and buy one online for $30.

anywho, big question still buzzing in my head.
this is supposedly a DPST switch, according the jamma nation x:


but that doesn't make sense, a DPST switch is set up with 4 pins.
what am I missing here?

[SignOfZeta]

That sure looks like a DPDT switch to me.

I suppose I should have posted a link to this earlier:

http://www.jammaboards.com/store/15a-arcade-switching-power-supply-with-digital-display-110w-pwr-p032.html

[majors]

http://www.jammaboards.com/store/15a-arcade-switching-power-supply-with-digital-display-110w-pwr-p032.html

That is kinda swank, you can check your 5v easy! Since I only have one game that needs -5v for sound, I've been hacking computer PSU's for my needs. The upside it it has 3.3v needed for CR-ROM systems. They also have self regulating outputs, so no need to adjust 12/5/3.3v.

Barte -> Get that Jrok yet?

[bartre]

Barte -> Get that Jrok yet?

yuppers, looks good to me, but i have no way to test it just yet.

That sure looks like a DPDT switch to me.

that's what i thought! but every single reference calls it DPST.
so i'm confused, is it some special kind of switch, is it an error, or am I just an idiot?

[bartre]

alright, so got the power supply, and wouldn't you know it, got another problem...
The PSU won't give me a voltage lower than 6.6v off the 5v line, unfortunately that's as low as i think it will go.
any ideas on what to do about that?

[SignOfZeta]

You have to adjust it with the board running. There is no draw on it now.

Btw, a lot of boards are really fragile, supposedly crapping out if even given .5V more than needed, so make sure you dial it in corectly.

[bartre]

so I need to have everything set up before I adjust it?
that seems counter intuitive.
Everything i've looked at said to get it dialed in before hooking anything up.
Ex: http://www.hardmvs.com/html/powerBoard2.htm

[SignOfZeta]

You can't measure working voltage on a incomplete circuit. The PCB will pull the voltage down.

EDIT: Which power supply did you end up getting? I just verified the one I got from jammaboards.com ranges only from the high 4s to the low 6s and if set to 5.0 it stays there when the board is installed. This is either because it does a good job of regulating or because the CPS2 I hooked up doesn't draw much current.