Wayne Parham Messages: 18782 Registered: January 2001
Illuminati (33rd Degree)
If you want just a simple RC filter (first-order), make the shunt resistance equal to the source resistance and set capacitive reactance of the series capacitor equal to that at the frequency where you want crossover. Capacitive reactance (Xc) = 1/2πfC. Since you want to find capacitance where reactance is known, use this formula instead: C = 1/2πfXc. Capacitive reactance (Xc) is in ohms and (f) is frequency in Hertz. Capacitance (C) is in Farads, so it will be very small. Remember that uF is x10-6 and pF is x10-12.
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