Voltage questions about mother boards

as oer the title i have some questions about voltage. I just built my first arcade stick about 1 month ago. My next plan is building my own ddr pad. Since i have many ddr version on many differant systems I figured i would just get teh same mother board i did for my stick and place it in a ddr pad shell and whire ir acourdingly. http://www.focusattack.com/akishop-ps360-multi-console-joystick-pcb/ this is the mother board that is in my stick and it works great. It also can work on every system i have a ddr game on so this is ideal for what i am wanting to build. <br><br>I am slightly worried however that the pads im thinking about buying http://na.suzohapp.com/amusement/gameparts/92501029.htm will send out a differant voltage than what the mother board can receive. Does anyone know if this matters? I can only imagion it does. Also does anyone know if there is anyway to test out what current these things can or can not receive?<br>

I think those DDR pads are like buttons.  If that’s true, then they should work with pretty much any voltage the controller uses.<br>

The easiest thing to work with electrically is a “dry contact” – a switch that physically opens and closes.  None of the mysteries of semiconductors, as long as you don’t put so much power through it that it will arc and weld itself closed (or evaporate) you don’t really need to care about voltages.  This is what all the microswitches used in arcade sticks and buttons are.  The button doesn’t itself send out any voltage but rather allows a signal put out by the board to pass through it or not.  Actually it usually allows ground (zero-voltage) to go through or not, but don’t get to fixated on that.  This isn’t exactly the picture I wanted, but this picture from <a href="Dual modding 101 thread</a> should be somewhat instructive:<br><img src=“http://i22.photobucket.com/albums/b305/letage/Dual%20mod%20101/CommonVSNCG.jpg”><br><br>From some cursory searching it looks like DDR pads also use physical contacts; probably someone will come by and confirm or deny this.<br><br>But if you want to remove all doubt, call or e-mail Suzo-Happ and ask for electrical specifications for the pads.  If they come back with something like a maximum current of like 20 miliamps, then you’ll have more homework, but if they say basically no limits, then it should be smooth sailing.<br>