Resonant low pass filter with continuously variable Q. Stacked pot with frequency on lower knob and Q on upper knob (center detent for 1/2 resonant boost).FV Variable Q FilterSKU: FV$44.95PriceQuantity*Add to CartSpecificationsResonant Peak Freq: 130-5300 Hz.Resonant boost: 0-13 dB.Board Dimensions: 28.8 x 22 x 3.7 mm.Idle Current: 0.68 mA.Lower Pot Shaft: Round, D=8mm, L=8mm.Upper Pot Shaft: Round, , D=6mm, L=10mm.Pot Bushing: M9x0.75, L=10mm.Nuts and washers included.