Resistor Dividers
Desired 1% Rb/(Ra+Rb) voltage divider:

Note: This is not really an exhaustive search. The algorithm used iterates through Rb values, finding the best Ra value for each Rb. For some concievable desired ratios, two of the best solutions may occur with the same Rb. This program won't find both.This condition exists at ratios very close to 1. I'd guess that it also exists on those oddball ratios where there just isn't a very good solution. So watch out. I am not a mathematician or a programmer.
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