It's a passive second order high pass filter, L-C type (inductor-capacitor):
• The celector center switch changes capacitors and connects more and more of the inductors in series.
• The toggle switch changes which (inductor or capacitor) goes to earth and out respectively; making it either highpass or lowpass.
• Resistors compensate for volume loss per frequency and for “Flat”.
I used the online calculators here (thank you!)
electronicbase.net/high-pass-...
Some more details can be seen here:
lookmumnocomputer.discourse.g...
Негізгі бет Музыка DIY King Tubby Big Knob Testrun (passive inductorbased filter)
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