Just in case the OP doesn't understand what this is this formula gives you the reactance of a capacitor at a given frequency in Ohms. Reactance is like resistance but only AC signals.|Xc| = 1/(2*pi*f*C)
since frequencies of carrier and audio signal differ greatly, you can use any value in quite wide range, for example 100pF - 2.2nF will do.
Perhaps the OP doesn't know what reactance is?|Xc| = 1/(2*pi*f*C)
since frequencies of carrier and audio signal differ greatly, you can use any value in quite wide range, for example 100pF - 2.2nF will do.