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LPT Switch

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cholin:
Dont think so...  this circuit doesnt need any chips, its all diodes.  Is that from the korean cab?  You probably have some noname one in there, not sure though.

Lilwolf:
I slightly changes the diagram... so that each group has a 'common ground'... I'm sure you can figure it out without much trouble.

IE, you cant plug the ground wire from player one into the positive in player 2. 

But after that... cabling looks like a common ground solution...

I was thinking that instead of trying to get a way to make the connections for the end user (screw in terminal or whatever) why not just wire them up... And after that I removed the board... And after that I rewired so there where only 5 different groups of buttons... And it all seems to be great....

but TONS of diodes... TONS of QDs... and TONS of heat shrink tubing to make it look good...

and after that...

I'm still worried about the drivers and the performance on a 4 player control panel with 4 buttons each if there will be any problems... but there is only one way to test it..

IntruderAlert:
I'll try to crawl inside there and get a better shot of it tonight

Hoagie_one:
i tested everything i could on mine short of hooking up a 4 player panel....I might still do that eventually.

lustreking:
I've been looking at the schematic on Trimoor's page, and there's something I must be missing.  Where do you hook up the other contact for all those switches?  There must be a common ground somewhere, right?

-Steve

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