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Logarithm Function Generated by Parallel Resistors

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Placing a fixed resistor in parallel with an adjustable resistor will cause the resistance of the combination to vary as the logarithm of the setting of the adjustable resistor over a limited range. Calculated compromises between accuracy and range cover ±0.1 percent over a 2.5:1 range to ±10 percent over a 175:1 range. A table of intermediate values is given.

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Computers, IEEE Transactions on  (Volume:C-18 ,  Issue: 4 )