Parts List for REV1 CT-40 CTCSS board:

U1 - Seiko S-7119BF encoder / decoder IC (surface mounted - preinstalled)
U2 - 78L05

Q1 - 2N2907
Q2 - 2N2222

D1 - 1N4004

LED1 - Red LED

R1 - 1k
R2 - 100 ohms
R3 - 680 ohms
R4 - 10k
R5 - 10k
R6 - 1k

TCXO - 3.5795 MHz Temperature Compensated Crystal Oscillator (TCXO) (surface mounted - preinstalled)

DS1 - 6 position DIP switch

S1 - 2 pin header (blue) with short
S2 - 2 pin header (blue) with short

SJ1 - SJ2 - 3 pin header (yellow) with short
SJ3 - 2 pin header (white) with short

C1 - .12 uF Metal film (124)
C2 - .1uF (104) 
C3 - 12 uF film
C4 - 4.7 uF 50V Electrolytic
C5 - .12 uF Metal film (124)
C6 - .47 uF
C7 - 4.7 uF 50V Electrolytic
C8 - 47 pF ceramic disc
C9 - 3.3 uF 50V Electrolytic
C10 - 3.3 uF 50V Electrolytic
C11 - .12 uF Metal film (124)
C12 - .12 uF Metal film (124)
C13 - .12 uF Metal film (124)
C14 - 47 pF ceramic disc
C15 - 47 pF ceramic disc

1 - DB25 Female chassis connector

1 - 6-pin blue header for remote switch connection.

1 - REV1 CT-40 circuit board 

Copyright 2021 Kevin K. Custer - W3KKC
Masters Communications
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