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Resistors (all ¼-watt, ± 5% Carbon unless stated otherwise)
R1, R3 = 5.6 Ω
R2 = 3.3 KΩ
R4, R6 = 1 MΩ
R5, R7, R9 = 1 KΩ
R8, R10 = 820 Ω
R11 = 10 KΩ
Semiconductors
IC1 = TL072CD
ZD1 = 3.3 V/500mW
LED1 = RED LED
LED2 = GREEN LED
LED3 = YELLOW LED
Miscellaneous
SW1 = Push to on switch
Two probe