Audio Spectrum Analyzer with Dekatrons
A New Way to Use Vintage Tubes
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Bill of Materials
Component List
Main unit
Resistors
R1,R2,R4 = 10 k
R3,R5 = 200 k
Inductors
L1 = 100 nH
Capacitors
C1 = 10 nF
C2,C4,C5,C6,C7,C10,C12,C13,C18 = 100 nF
C3,C11 = 33 pF
C8,C9 = 12 pF
C14 = 100 µF, 25 V radial
C15 = 100 µF, 16 V radial
C16 = 15 µF, 500 V radial
Semiconductors
D1...D8 = 1N4007
IC1 = ATMEGA328P
IC2,IC3 = MSGEQ7
IC4 = 78L05
Others
JP1,JP2 = 2-way terminal block
Q1 = crystal 20MHz
SV1 = 6-way SIL header
SV2 = 8-way SIL socket
SV3 = 3-way SIL header or stereo jack connector
Mains transformer 9 V 1 VA
Mains transformer 350 V 1 VA (see text)
Dekatron unit
YOU NEED EVERYTHING BELOW 7 TIMES!
Resistors
R0..R7 = 10 k
R8 = 820 k
Capacitors
C20 = 100 nF
Semiconductors
T0...T6 = MPSA42
IC1 = 74HC595N
Others
SV1 = 8-way SIL header
SV2 = 8-way SIL socket
6802 Dekatron with octal socket
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