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$%# the freakin' $$$ keeps adding up, Druin help inside please!
rdagger:
--- Quote from: XtraSmiley on April 14, 2006, 02:54:32 pm ---Thanks the Ipac solution is the best, but if I did go with a cheap solution I'll keep the damage aspect in mind, although it would damage the Druin, not Ipac is what you meant to say, right?
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No, you could "in theory" damage both. You'd have to verify with Randy, but assuming the IPAC inputs pins are normally 5V high with internal pull-up resistors and that rotary interface output pins are also normally high at 5V than if one of the power supplies is out of equilibrium than it is possible that you could get an undesired flow of current. Cheap power supplies are not very well regulated. Both the Cyprus chip on the IPAC and the Atmel chip on Druin's board have a 5.5V maximum.
--- Quote ---Tell me more about this "polarity" thing. What is that, and how do I check it? I have a meter, but no idea about how to check that. If I go with my diagram, won't things be right on the money? What do I need to check?
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Set your meter to test DC volts. Place the red probe on the +5V output from the IPAC and place the black probe on the Ground output from the IPAC. The meter should read approximately 5V. If it reads -5V than you are doing something wrong. It is very likely that if you reversed the 5V and the Ground that you would blow the bypass capacitor on the rotary interface and possibly damage the microcontroller.
Kremmit:
--- Quote from: rdagger on April 14, 2006, 06:13:32 pm ---No, you could "in theory" damage both. You'd have to verify with Randy, but assuming the IPAC inputs
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Maybe verify with Andy instead. ;)
XtraSmiley:
Wow, instructions that even I could understand. Thank you everyone. Once (if) I get the CP in and actually install it all, I'll take photo's and let everyone know how it works. I hoping by then Power MAME has all the rotary problems worked out perfect.
Thanks, a million times thanks!