Our new book uses these calculators to design preamp stages, cathode followers, tone stacks, power amps, phase inverters, negative feedback, and power supplies.
There is a familiar formula for the voltage gain of a voltage divider formed by two resistors: A = R2/(R1+R2). Not so familiar are the formulas for determining the value of R1 or R2 when a specific amount of attenuation is desired. Here is a calculator that determines the unknown resistor value.
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