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Parts: R1__________100K 1/4W Resistor
R2___________50K 1/2W Trimmer Cermet
R3__________330K 1/4W Resistor
R4____________1M2 1/4W Resistor
R5__________470K 1/4W Resistor
R6,R7_______500K 1/2W Trimmers Cermet
R8____________1K5 1/4W Resistor
R9-R11______470R 1/4W Resistors
C1___________47pF 63V Ceramic Capacitor
C2__________100nF 63V Polyester Capacitor
C3___________47µF 25V Electrolytic Capacitor
C4____________1µF 25V Electrolytic Capacitor
D1______BZX79C5V1 5.1V 500mW Zener Diode
D2_________1N4148 75V 150mA Diode
D3-D5________3mm. Yellow LEDs
IC1_________LM339 Quad Voltage Comparator IC
SW1__________SPST Slider Switch
B1_____________9V PP3
Clip for 9V PP3 Battery