Circuit diagram:
Parts:
P1,P2_________100K Linear Potentiometers P3____________470K Linear Potentiometer
R1,R2,R3_______12K 1/4W Resistors R4,R5___________3K9 1/4W Resistors R6,R7___________1K8 1/4W Resistors R8,R9__________22K 1/4W Resistors R10___________560R 1/4W Resistor R11___________100K 1/4W Resistor R12___________220R 1/4W Resistor
C1______________1µF 63V Polyester Capacitor C2_____________47nF 63V Polyester Capacitor C3,C5___________4n7 63V Polyester Capacitors C4_____________22nF 63V Polyester Capacitor C6,C8_________100µF 25V Electrolytic Capacitors C7______________4µ7 63V Electrolytic Capacitor
IC1___________TL061 Low current BIFET Op-Amp
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