Did some tests today
Found out that the max voltage that the inductor will see is about 35 millivolts p to p at resonance, regardless of input signal levels and frequencies, so saturation of the inductor, no matter which one you use, is probably not going to be a factor. The wah circuit limits the output amplitude of the upper and lower frequencies above about 3 k hz and below about 200 hz to about 80 millivolts, so a low frequency signal large enough to saturate the inductor will never occur do to this voltage limiting. When the output level is sitting at 80 millivolts, the inductor voltage sits at about 5 millivolts or less.
Saturation might be a factor at 100 hz if you had a good level across the inductor, but the circuit prohibits this.
I plotted some response curves at three different frequencies, 367 hz which was the rez freq at pedal up, 816 hz which was rez freq at pedal in the middle, and 1.98 k hz which was rez freq at pedal down.
Output at resonance with a 50 millivolt RMS input signal was about 440 millivolts RMS at all three test freqs.
The Q of the curves at the three freqs was steeper at the 367 hz signal freq and flatter at the 2 k hz in freq.
This got me thinking of a possible mod, a dual 100 k pot.
One would be wired as usual, at the output signal part of the circuit, and the other would be wired into the tank circuit so as to vary the Q of the wah wah as it was being played.
What say?
