Parts List for CSM-32S CTCSS Board - REV1:

U1 - MX465DW (CML) (pre-installed)
U2 - 78L05 Voltage Regulator

Q1 - 2N2907 PNP switching transistor 
Q2 - 2N2222 NPN switching transistor 

D1 - 1N4004 Diode
D2 - LED - Red LED
D3 - 1N4148 Diode 

All fixed resistors are 1/8W thru-hole

R1 - 1k
R2 - 100 ohms
R3 - 680 ohms
R4 - 1 Meg
R5 - 560k
R6 - 820k
R7 - 10k
R8 - 10k
R9 - 10k
R10 - 1k
VR1 - 10k Pot 3362 type

X1 - 4.000 MHz crystal thru-hole with plastic spacer

SJ1-2 - 3 position header (yellow) with short

NOTE - Some capacitors may need their leads straightened prior to installation
to allow the part to sit down tight against the board.

SMT = Surface Mounted Component - all are at least 1206 size and are not polarized. 
On kits - the SMT components are supplied in bags that identify their value.  DO NOT
remove the parts until you are ready to install them, so they don't get mixed up.

Capacitors:

C1 - .1uf ceramic SMT
C2 - 33 pF ceramic SMT
C3 - 18 pF ceramic SMT
C4 - 4.7 uF Electrolytic (Polarized) 
C5 - .1uf ceramic SMT
C6 - .47 uF ceramic SMT
C7 - .22 uF ceramic
C8 - 47 pF ceramic
C9 - .12 uF film
C10 - .12 uF film
C11 - .12 uF film
C12 - .12 uF film
C13 - 1.0uF ceramic SMT
C14 - 47 pF ceramic
C15 - 47 pF ceramic
C16 - .47 uF ceramic SMT
C17 - .12 uF film
C18 - .47 uF ceramic SMT
C19 - 4.7uf Electrolytic (Polarized)
C20 - 1.0uF ceramic SMT

SW1 - 6 Position 1.27mm pitch Frequency Select DIP Switch SMT (pre-installed)
On kits - this switch has a tape membrane that gets removed after the SMT parts
have been installed and the board is cleaned of flux.

11 position male header (pins) Option:
Vertical (straight),  Horizontal (angled) or None.

CSM-32S printed circuit board (green) REV1

Copyright 2025 Kevin K. Custer - W3KKC and
Masters Communications
All Rights Reserved