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My Question: Radio Shack only had a 5.1V Zener Diode. WOuld it be possible to swap out the 4.7V Zener the schematic calls for and use the 5.1V instead? I wouldn't think less than half a volt would make much difference, but thought I should ask first.
Shouldn't be a problem, I think there might actually be a way to drop the .4 volts, perhaps try using a slightly smaller power supply on your calc, like 4 AA lith ions (the 1.2v kind so instead of having 6v, you'll have 4.8v) that way, when you get the extra voltage going to it, it shouldn't hurt it.