Circuit diagram:
Parts:
R1,R2,R7_______22K 1/4W Resistors R3,R4,R5_______47K 1/4W Resistors R6______________4K7 1/4W Resistor R8,R13________220R 1/4W Resistors R9______________2K 1/2W Trimmer Cermet (See Notes) R10___________470K 1/4W Resistor R11___________560R 1/4W Resistor R12___________100K 1/4W Resistor
C1____________470nF 63V Polyester Capacitor C2,C8_________100µF 25V Electrolytic Capacitors C3,C4,C5________2µ2 63V Electrolytic Capacitors C6_____________47pF 63V Ceramic Capacitor C7______________4µ7 63V Electrolytic Capacitor
Q1____________BC560C 45V 100mA Low noise High gain PNP Transistor Q2____________BC550C 45V 100mA Low noise High gain NPN Transistor
IC1___________TL061 Low current BIFET Op-Amp
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