> Note that trick #7 is not a complete description: no optimal resistor
> values, no formula to derive these values, no analysis of the required
> accuracy of the resistors (both for various matrix sizes). If it can be
> done with 1% it would be usefull, if it requires 0.1% it might not be
> cost-effective, if it requires better than 0.1% it is probably
> infeasible.

Not to mention switch contact resistance. Using that method for more than
4 switches is asking for trouble.

-Bob


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