Use these formulas to calculate values of a capacitor and a resistor needed to
construct a Zobel filter.
If you need an 8 omh resistor, you can series
two 4 ohm resistors. If you need a 3 µfd capacitor, you can
parallel two 1.5 µfd capacitors. When the exact value of a
capacitor is not available, you can substitute values of ± 5%.