Speech Filter
Materials
Gerber file
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Component list
R1.R2 = 22kOhm
R3,R11,R12,R18,R19 = 100kOhm
R4 = 470Ohm
R5 = 150Ohm
R6 = 10kOhm
R7 = 18kOhm
R8 = 15kOhm
R9 = 33kOhm
R10 = 82kOhm
R13-R17 = 3kOhm 3
Capacitors:
C1,C8,C14,C15 = 100nF
C2 = 1µF MKT
C3-C7,C11 = 22nF
C9 = 33nF
C10 = 18nF
C12 = 10nF
C13 = 4nF7
C16,C17 = 10µF 16V
Semiconductors:
IC1,IC2,IC3 = OP27A, TL081CN
Miscellaneous:
Bt1 = 9-V battery
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