2. OpenTracker Assembly Notes
Table
1
–
Parts
List
Part
Description
Notes
U1
MC908KX8
MCU
with
socket
Reference
notch
faces
left
U2
78M05
Voltage
Regulator
Install
first
U3
LM335Z
Align
to
silkscreen
outline
R1,
R7
10
K
resistor
Brown
‐
Black
‐
Orange
R2
220K
resistor
Red
‐
Red
‐
Yellow
R3
2.2K
resistor
Red
‐
Red
‐
Red
R4
1K
resistor
Brown
‐
Black
‐
Red
R5
3K
resistor
Orange
‐
Black
‐
Red
R6
6.8K*
resistor
Blue
‐
Gray
‐
Red
R8,
R9
10K
potentiometer
Align
pins
to
holes
R10
10M
resistor
Brown
‐
Black
‐
Blue
R11
20K
resistor
Red
‐
Black
‐
Orange
JP1
10
‐
pin
header
Single
row
.100
pins
C1
0.33uF
capacitor
Yellow
with
“334”
marking
C2
‐
C4
0.1uF
capacitor
Yellow
with
“104”
marking
C6,
C7
18pF
capacitor
“180”
or
“180j”
marking
Q3,
Q4
2N7000
transistor
Align
to
silkscreen
outline
D1
‐
D2
1N914
or
1N4148
diode
Black
band
denotes
cathode
LED
Red
LED
Short
lead
faces
toward
R4
X1
DB9
Connector
‐
female
Left
edge
of
board
X2
DB9
Connector
‐
male
Right
edge
of
board
Y1
29.4912
MHz
crystal
Bend
down
to
PCB
before
soldering
*
A
6.2K
resistor
(Blue
‐
Red
‐
Red)
may
be
substituted
for
R6
The
OpenTracker
kit
requires
basic
to
intermediate
level
soldering
skills.
You
will
need
a
low
‐
wattage
soldering
iron,
wire
cutters,
and
solder.
Rosin
core
solder
is
recommended
–
never
use
acid
core
solder
for
electronics.
Review
the
parts
list
and
identify
the
components
you
received.
If
any
are
missing
or
damaged,
contact
for
replacements.
Don’t
worry
if
your
kit
includes
extra
resistors
or
other
parts
not
listed
above
–
these
are
provided
for
modifications
and
alternate
versions
of
the
kit.
U2
is
a
surface
mount
device
and
should
be
installed
first
for
ease
of
soldering.
Apply
a
small
drop
of
solder
to
one
pad
and
keep
it
melted
while
you
align
the
part.
Solder
the
other
leg
and
the
metal
tab
at
the
top,
making
sure
that
the
solder
forms
a
good
junction
between
the
tab
and
the
circuit
board
for
proper
heat
transfer.
OpenTracker Manual - Version 1.05 – 6/25/06
page of
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