multi jamma switcher options for light gun setup

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runawayabc123:
[Edit]This thread has turned into build my own custom multi-switcher setup for light guns and players 3/4. Read on for details.[/Edit]

I have several light gun games that I want to be able to switch between.

I kind of have two choices, buy a switcher and abuse the jamma harness for my means OR build my own.

Thinking about the building, I would just need several diodes and 3 relays per board (12/5/-5v power) with a master dial to control which one is on. The problem is, I haven't been able to find the voltage/amp specs on a jamma harness to fully design such a switcher. I think most stuff is all 5v, but where does the 12v go? (Relative to the other pins on the board, of the other 55 pins, which is also 12v? Same for -5v for sound?)

Thanks.

BobA:
See this site for info on multi jamma power requirements.

Jamma Multigames

runawayabc123:
I didn't mean the incoming voltage, I meant the outgoing voltage on the jamma harness. (Powering buttons, video, etc) This is to correctly size diodes/transistors/relays. Based on your link and it all running on a 40 pin IDE cable, I would imagine all are 5v with very little current.

Thanks for the link, it was a great read. I would totally buy/use that switcher, if it supported light gun games. It has 4 extra wires for jamma+ custom use, but I would need 8 (6+2grounds) wires or only one light gun. Infact, I don't even know if I could use his wired ground, and if he has diodes to protect the other games, I couldn't put a ground on one of his 4 pins for custom use. So, that whole custom part is a maybe for light guns with a max of 1 gun. :-[

I still think I am stuck doing it all on my own. I also don't want to power all of the boards when I turn it own. But, for a canned solution, I won't be choosey.

Lastly: if anyone has this board: http://www.jammaboards.com/store/6-in-1-multijamma-switcher-pcb/prod_250.html and could tell me what diodes are on it and if those are 2 tranistors or relays per board and what they are, I would be very greatful.

runawayabc123:
So, I am not attracting a whole lot of replies with this thread. Any want to post their 2 cents on why? Too long of a post? Confusing? I am doing something off of the deep end and everyone is staying far away? Thanks.

BobA:
Not sure what you are looking for re outgoing power. As long as you have a supply that can provide enough power you will be fine. The size of the wires in a jamma harness will support anything you provide. As for the multi jamma switcher the stock that jammaboards seems to have is nil or discontinued on most items if you check their store. Cannot say how well that unit works or if you can get one.

If you want to add light guns to your switcher they would have to be the same one for all boards in order to switch them. I would switch with a relay to make sure the of isolation. This relay could be switched by the power on the jamma board that you select.

Regarding diodes. Most signal lines (buttons) are switched with signal diodes which are cheap an low current. Cannot think of the number off hand but they are very common and very small. Power on the other hand is usually switched with relays looking at the multi boards that I have seen.

Hope that helps a bit.

Found the number 1N4148 Diode

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