Heathkit IG-18 User manual
PRICE
$2.00
:IIEAT:IIKIT®
A.SSElM:BLY"
lM:A.N"t.T.A.L
SINE-SQUARE
AUDIO
GENERATOR
Copyright Q 1968
Heoth Compony
A/I.,,ff,:.
",,,,,J
MODEL
IG·18
595-1179-05
Assembly
and
Operation
of
the
SINE-SQUARE
AUDIO
GENERATOR
MODEL
16-18
HEATH
COMPANY
BENTON
HARBOR,
MICHiGAN
49022
Page
2
TABLE OF CONTENTS
INTRODUCTION. •
UNPACKING
•••••••••
WAVE GENERATOR
Parts
List
••••••••••••
• • • • • • •
I-
••
'"
••••••••••••••
Step-By-Step
Assembly
Circuit
Board
Mounting.
Circuit
Board
Assembly.
POWER
SUPPLY
Parts
Ltst.
. . . . .
.........•.......
Step-By-Step
Assembly
Circuit
Board
Mounting And
Assembly.
SWITCH
PRE
WIRING
Parts List. . . . . .
.....................
..
*'
,.
*'
,.
••
'"
•
Step-By-Step
Assembly
Multiplier
SWitch. • • • • • • •
••
Tens
Frequency
Switch. • • • •
Units
Frequency
Switch. • • • •
Square
Wave
Amplitude
Switch. •
Sine Wave
Amplitude
Switch
•••••••
CHASSIS ASSE MBLY
.....
Parts
List.
. . . . .
............................
..
..
Step-By-Step
Assembly
Front
And
Rear
Panel
Subassemblies.
•
Unit
Assembly.
• • • •
Top
Chassis
Wiring.
• • •
•••
Bottom
Chassis
Wiring.
120-240
VAC
Wiring
Alternative.
Knob
Installation.
• • •
Test
Lead
Assembly
••
TESTS
AND
ADJUSTMENTS
Tests.
. . . . . . .
.......
.
Adjustments.
• • • • •
••••
FINAL ASSEMBLY
••
OPERATION
••••
APPLICATIONS. • •
• •
til
•
.
..
IN CASE
OF
DIFFICULTY.
.........
Troubleshooting
Chart.
Factory
Repair
Service.
• •
SPECIFICA
TIONS. • • •
CIRCUIT DESCRIPTION
Sine
Wave
Generator
••••••••
Square
Wave
Generator
••
Power
Supply
•••••••••••••
CIRCUIT BOARD
X-RAY
VIEWS.
CHASSIS PHOTOGRAPHS.
REPLACEMENT
PARTS
PRICE
LIST
••
SCHE
MA
TIC. • • • •(fold-
out
from
page).
• •
...
...
....
3
4
5
6
7
11
12
15
16
17
18
19
37
39
41
45
47
50
57
58
59
60
63
65
65
67
69
71
75
INTRODUCTION
The Heathkit Model IG-18 Sine-Square Audio Generator has
been designed for laboratory use
as
well
as
for service and
testing. Sine wave signals are available between 1
Hz
and 100
kHz. Low distortion (less
than
.1%) sine wave signals are
available from
10
Hz
to
100 kHz. The
output
is
stepped from
.003 volt
to
10
volts. These
high
quality sine
wave
signals
make
it
ideal for such applications
as
testing audio amplifiers
for gain
and
frequency response,
as
a signal source for
harmonic distortion measurements, or
as
ap external
modulator for an
RF
signal generator.
Square wave signals with a rise time of 50 nanoseconds are
available from 5
Hz
to
100 kHz
at
output
levels up
to
10
volts. These clean square wave signals can be used for
checking frequency response in audio equipment, or as a
trigger for testing digital instruments.
HElATHKIT®
The sine
and
square wave frequencies are identical and
thc
level
of
each is independently adjustable. Both signals may be
used either simultaneously or independently.
The sine wave
output
will operate into high impedance loads
(10
kn
or higher) in all
output
ranges, or
it
will opcrate into
600 ohm loads in ranges up
to
1 volt. The square wave
output
is
designed
to
operate into loads of 2000 ohms or
greater.
Other features include: A panel meter for monitoring the sine
wave
output;
repeatable selection of any frequency;
switch-selected 600 ohm internal load;
and
all solid·state
circuitry for maximum reliability. All of these features
combine
to
provide you with a versatile, accurate, and
attractive signal source.
It
will be a valuable and useful
addition
to
your
laboratory or workbench.
3
UNPACKING
This
kit
is
packed
in
a
large
shipping
carton,
which
contains
smaller
packages
and a
number
of
loose
parts.
Some of
the
smaller
packages
have
numbers
1
through
3
stamped
on
them
(Pack
#1,
Pack
#2,
Pack
#3).
After
these
three
numbered
packages
have
been
removed
from
the
large
carton,
the
remaining
parts
in
the
carton
will
make
up
package
#4.
Each
assembly
section
of
the
Manual
contains
its
own
Parts
List
and
Step-By-Step
instructions.
At
the
beginning of
each
Parts
List
you will
be
told
which
numbered
package
to
open. You
will
also
be
directed
to
remove
the
parts
from
package
#4
that
are
required
to
complete
that
assembly
section.
4
To avoid
parts
at
the
Any
tools,
wiring,
sembly
procedures.
To order replacement parts,
do
not
open an;
directed
to do
Sl
the
Parts
Lists
in
an
individua
wml:.er
on
it,
should b
it
is
identifiel
Price List" and use the Parts Order
kit.
th
HEATHK
WAVE
GENERATOR
PART
PARTS
No.
Per
Kit
RESISTORS
1/2
Watt
(1)1-54 2
1-66
2
1-97
3
1-98
2
1-89
2
1-16
2
1-20
6
1-47
1
1-29
1
1 Watt
(2)1-56-1 1
CAPACITORS
(3)20-128 1
PARTS
LIST
Open
package
#1 and
check
each
part
against
the following
Parts
List.
The
numbers
in
parentheses
correspond
to
the
numbers
on
the
Wave
Generator
Parts
Pictorial
(fold-out
from
Page
5).
DESCRIPTION
PART
PARTS DESCRIPTION
No.
Per
Kit
Diocles-
Transistors
(cont'd.l
(9)417
-94
3 2N3416
transistor
417-201 2 X29A829
transistor
15
n
(brown-green-black)
(10)417-154 3 2N2369
transistor
150
n
(brown-green-brown)
1100 n
(brown-brown-red)
HARDWARE
1600 n
(brown-blue-red)
2400 n
(red-yellow-red)
(11)250-89
4700 n
(yellow-violet-red)
(12)254-1
10
kn
(brown-black-orange)(13)259-1
56
kn
(green-blue-orange)(14)252-3
220
kn
(red-red-yellow)
(15)250-175
1200 n
(brown-red-red)
(16)254-7
(17)252-51
8
7
1
8
1
2
1
MISCELLANEOUS
(18)260-24 1
(19)
412-66
1
6-32
X 3/81!
screw
#6
lockwasher
#6
solder
lug
6-32
nut
2-56
x
3/81!
screw
#3
lockwasher
2-56
nut
Lamp
clip
Lamp
(4)
21-16
1
(5)25-200 1
470
pF
resin
.01
fJ.F
disc
.68
fJ.
F
electrolytic
85-257-2
1 Wave
generator
circuit
board
Solder
CONTROLS
(6)10-155
10-201 2
2 750 n
10
kn
DIODES-TRANSISTORS
(7)
56-26
2
Crystal
diode
(8)
56-56
1 Silicon diode
57-65
2 Silicon diode
HEATHKIT®
PARTS FROM -PACKAGE
#4
(20)200-516
597-308
597-260
391-34
490-5
1
1
1
1
1
1
Chassis
Kit
Builders
Guide
Parts
Order
Form
Identification
label
Nut
starter
Manual (See
front
cover
for
part
number.)
5
page
5b
WAVE
GENERATOR
PARTS
PICTORIAL
® ®
®
@
® ®
@ ®
®
Page
6
STEP-BY·STEP
ASSEMBLY
CIRCUIT
BOARD MOUNTING
( )
Position
the
chassiS
in
front
of you
as
it
is
shown in
Pictorial
1.
NOTE: A
plastic
nut
starter
is
supplied
with
this
kit.
Use
this
nut
starter
to
hold
and
start
6-32
#6
and
2-56
nuts
on
screws.
Refer
to
Page
3 of
the
Kit
Builders
Guide
for
further
information.
( )
Refer
to
Detail
1A
and
fasten
the
wave
generator
circuit
board
to
the
chassis.
Use
eight
6-32 x
3/8"
screws,
seven
#6
lockwashers,
one #6
solder
lug, and
eight
6-32
nuts.
Note
the
position
of
the
solder
lug.
NOTE: Due
to
its
size,
only
one-hali
of
the
circuit
board
is
shown
in
each
of
the
next
four
Pictorials.
A
small
drawing
at
the
top
of
each
Pictorial
shows
the
area
of
the
circuit
board
to
be
assembled.
Proceed
to
the
Circuit
Board
Assembly
section.
0 e 6
+
:CJ:
+
iI:B
QD
\~
~
I I
Detail 1A
e @
I
CJ09~
DO
0(:>-
80-=-
P-E}
P-
e
0$8]
.~~OlCt?S~O
e
6
",
00
Q'o
OO~
0
o +
G
POWER
SUPPLY+
0 1
1
$0
u
aqooo~
CIRCUiT
BOARD
~
e
WAVE
GENERATOR
(0
CIRCUIT
BOARD
e
~
~
PICTORIAL 1
~
y)
CIRCUIT
BOARD ASSEMBLY
IDENTIFICA
TION DRAWING
START
The
steps
on
this
Page
this
area
of
the
circuit
board
•
..
FOR
GOOD
SOLDERED
CONNECTIONS,
YOU
MUST
~_'
!
KEEP
THE
SOLDERING
..-/,
~
;;
IRON
TiP
CLEAN.,.
~~~,
/ Ij
WIPE
IT
OFTEN
WITH
A
~
DAMP
SPONGE
OR
CLOTH.
1600 n
(brown-blue-red),
1200 n
(brown-red-red)
1
watt.I--+~~~"'"
150 n
(brown-green-brown),
..
) 10
Kn
(brown-
black-orange),
10
Kn
(brown-black-orange).
Prepare this combination before in-
stalling
it
on
the
circuit board: 10 K
(brown-black-orange) silicon diode
(#56-56).
CD
t;/
l'»,f{:)
?~
WRAP
DIODE LEADS-
~;(/
J~
~
~
IJ
CUT
EXCESS
()
DIODE
LEADS
CD
/
)fg
SOLDER
( ) Install this combination
so
that
the
banded end
of
the
diode matches the
markings
on
the circuit board.
( )
Solder
all
the
leads
to
the
foil
and
cut
off
the
excess
lead
lengths,
PICTORIAL
2
Page
7
CONTINUE
Q
(brown-
blue-
red).
(red-
yellow-
red),
and
cut
lengths,
lead
NOTE:
Before
mounting
lamp
clip,
bend
its
sides
out
permit
the
screw
head
to
pass
by
the
ridges
in
the
clip,
and
to
prevent
lamp
breakage
from
too
much
spring
ten-
sion.
Mount
the
lamp
clip
with
the
#2
hardware,
W2-56 x 3/8"
SCREW
/iPl~~i;i:~;
ell
P
,'::~.:.::',':.:@J.:#
3 L0CK
WAS
HER
:·.~?\\::::~~}:·~~8~~~~::)~··;:~·:
~#3
LOCKWASHER
®
2-56
NUT
( )
Slide
the
lamp
into
the
clip
from
one
end
of
the
clip.
NOTE:
Make
certain
the
lamp
leads
are
not
crossed
or
touching
each
other,
( )
Insert
the
leads
through
the
in-
dicated
holes
on
the
circuit
board,
( )
Solder
both
leads
to
the
foil
and
cut
off
the
excess
lead
lengths.
PROCEED
TO
PICTORIAL
3,
SWITCH
PREWIRING
PARTS
PICTORIAL
BLK
(2)
~.
GR~
OR~
~,
~
,.
BRN
~
'-
_:
CD
r
-.,.
'-
..,I
OR
=CI
J-
Page
8
START
..,.
15 Q
(brown-green-black),
15
Q'
(brown-green-black).
10 kQ
(brown-black-orange).
10 kQ
(brown-
black-orange).
4700 Q
(yellow-violet-red),
56 kQ
(green-blue-orange),
( )
,68
IJ-F
electrolytic
capacitor.
NOTE:
Position
the
positive
(+)
lead
as
shown.
MAY
BE
MARKED WITH
POSITIVE
SIGN
(+)
OR
COLOR
DOT
( )
Solder
all
the
leads
to
the
foil
and
cut
off
the
excess
lead
lengths,
IDENTIFICATION
DRAWING
PART
NUMBER
The
steps
on
this
page
are
done
in
this
area
of
the
cir-
cuit
board,
PICTORIAL
3
CONTINUE
o
NOTE: When
installing
diodes,
the
cathode
end
must
be
positioned
as
shown
on
the
circuit
board,
The
cathode
end
is
marked
either
a
color
end,
color
dot.
band
or
a
symbol.
CO
LO
R
~
COLOR
001
)!fr
SYM
(CATHO
END~
~
COLO
BAND
~
)
Silicon
diode
(#57-65)
Silicon
diode
(#57-65)
150 Q
(brown-green-brownl.
10 kQ
(brown-black-orange),
220 kQ
(red-red-yellow).
1100 Q
(brown-brawn-red),
1100 Q
(brown-brown-red).
1100 Q
(brown-brown-red).
Solder
all
the
leads
to
and
cut
off
the
excess
lengths.
PROCEED
TO
PICTORIAL
START
•
(
),01
flF
disc
capacitor.
Turn
the
chassis
over
and
connect
the
capacitor
lead
closest
to
the
edge
of
the
circuit
board
to
the
#6
solder
lug
(S-I).
Also,
solder
each
lead
to
its
foil,
Cut
off
ex-
cess
leads,
NOTE: When
installing
diodes,
be
sure
to
position
the
cathode
end
as
shown.
The
cathode
end
is
the
banded
end.
COLOR
;jY
CATHODE
END
( ) IN191
crystal
diode
(brown-
white-brown)
at
D3. Note
the
position
of
the
banded
end.
( ) IN191
crystal
diode
(brown-
white-brown)
at
D4. Note
the
position
of
the
banded
end.
Solder
all
leads
to
the
foil
and
cut
off
the
excess
lead
len
hs.
IDENTIFICATION DRAWING
The
steps
on
this
page
are
done
in
this
area
of
the
circuit
board,
PICTORIAL
4
Page
9
CONTINUE
Q
NOTE:
Refer
to
the
HhlstJration
low
to
determine
the
lo{:ation
collector
(C),
base
(B),
(E)
leads
of
the
2N2369 (#417-154)
transistors,
Align
the
leads
the
holes
in
the
circuit
board,
press
down
gently
until
the
transis-
tor
is
about
1/4"
from
the
circuit
board,
Bend
the
leads
to hold
the
transistor
in
place.
( )
Transistor
2N2369 (#417-154)
at
(:;8,
Transistor
2N2369 (#417-154)
at
Q7.
Transistor
2N2369 (#417-154)
at
Q6,
( )
Solder
all
the
transistor
leads
to
the
foil
and
remove
the
excess
lead
lengths,
NOTE:
It
may
be
necessary
to
bend
the
control
lugs
out
slightly
to
hold
the
control
in
place
until
it
is
sol-
dered,
( ) 10 krt
control
(#10-201).
10 krt
control
(#10-201).
Solder
all
the
control
lugs
to
the
foil.
PROCEED
TO
PICTORIAL
5.
POWER
SUPPLY
PARTS
LIST
Open
package
#2
and
check
each
part
against
the
following
Parts
List.
The
numbers
in
par-
entheses
correspond
to
the
numbers
on
the
Pow-
er
Supply
Parts
Pictorial.
PART
PARTS DESCRIPTION
PARTS
PICTORIAL
No.
Per
Kit
RESISTORS-CAPACITORS
(1)1-1 1
1-89
1
47 n
1/2
watt
resistor
70
....
1.....
.
(yeHow-
violet-
black)
2400 n
1/2
watt
resistor
(red-yellow-red)
(2)25-126 1
50
/-LF
capacitor
DIOOES-TRANSISTOR
(3)
56-66
1 VR
43
zener
diode
(4)57-65 2
Silicon
diode
(5)417-178 1 40389
transistor
HARDWARE
(6)250-89 4
6-32
x
3/8"
screw
(7)254-1 8 #6
lockwasher
(8)252-3 8
6-32
nut
MISCELLANEOUS
CD
©
~J'
54-205 1
Power
transformer
85-256-2
1
Power
supply
circuit
board
344-50 1
Black
wire
344-52 1
Red
wire
HEATHKIT
®
CD
8r~r.Ui""1
CD
@
11
Page
12
STEP-BY-STEP
ASSEMBLY
CIRCUIT
BOARD
MOUNTING
AND ASSEMBLY
Detail
6B
( )
Refer
four
ers,
6B.
Perform
Detail
6A
Detail
6A
and
fasten
the
power
circuit
board
to
the
chaSSis. Use
x
3/8"
screws,
four
#61ockwash-
four
6-32
nuts
as
shown
in
Detail
steps
on
Pictorial
6.
START
..
47
r;z
(yellow-violet-black).
) 2400
(red-Yellow-red).
)
Install
40389
transistor(#417-
178
QI0.
The
collector
(C)
and
emitter
(E)
leads
are
on
either
side
of
the
wide
space,
Line
each
lead
with
the
cor-
rect
and
position
the
tran-
sistor
the
circuit
board,
ID:tE~
SPAC~
..
.......
C\~E
:-:.:
;.;.
........
c B
)
Solder
all
the
leads
to
the
foil
and
cut
off
the
excess
lead
lengths.
PICTORIAL 6
CONTINUE
o
NOTE: When
installing
diodes,
the
cathode
end
must
be
positioned
as
shown
on
the
circuit
board.
The
ca-
thode
end
is
marked
with
either
a
color
end,
color
dot,
color
band,
or
a
symbol.
COLOR
~
001
~
SYMBOL
(CATHODE
~
COLOR
BAND
~
Silicon
diode
(#57-65)
at
D5,
Silicon
diode
(#57-65)
at
D6.
Zener
diode
VR 43 (#56-66)
at
D7.
) 50
/IF
tubular
capacitor.
NOTE:
Match
the
positive
(+)
mark
on
the
capacitor
with
the
positive
(+)
mark
on
the
circuit
board.
( )
Solder
all
the
leads
to
the
foil
and
cut
off
the
excess
lead
lengths.
This
completes
the
construction
of
the
power
supply
circuit
board
ex-
cept
for
the
three
300
/IF
60 V
capa-
citors
which
will
be
mounted
later.
FI
N
ISH
Proceed
with
the
mounting
of
the
power
transformer.
Refer
to
Pictorial
7 (fold-out
from
Page
17) and
to
Detail
7A
for
the
following
steps.
( ) Mount
the
power
transformer
to
the
under-
side
of
the
chassis
with
four
#6
lockwash-
ers,
and
four
6-32
nuts.
Connect
the
power
transformer
leads
to
the
power
supply
circuit
board
as
follows:
( ) One
red
to U (8-1).
( )
Red-yellow
to
V (8-1).
( ) The
other
red
to
X
(S-l).
NOTE: When
wiring
this
kit,
you
may
find
it
easier
to
prepare
the
lengths
of hookup
wire
ahead
of
time,
as
in
the
following
step.
The
wires
are
listed
in
the
order
in which
they
will
be
used.
Remove
1/4"
of
insulation
from
the
ends
of
each
wire.
( )
Prepare
the
following
lengths
of hookup
wire:
6"
red
5-1/2"
black
Twist
these
two
wires
together
to
form
a
twisted
pair
as
shown
in
Detail
7B.
( ) At
the
end of
this
twisted
pair
with
the
2"
black
Wire, connect
the
black
wire
to
hole Y
NEG
(S-l)
and
the
"red
wire
to
hole
Z POS
(S-1) in
the
power
supply
circuit
board.
( ) At
the
other
end of
this
twisted
pair,
connect
the
1"
black
wire
to
hole C NEG (S-1) and
the 3"
red
wire
to hole A POS (S-1) in
the
wave
generator
circuit
board.
The
chassis
subassembly
is
now
complete.
Recheck
your
work;
thEm
proceed
to
the
switch
prewiring.
1"
I
2"
I
~3/4"
RED
3"
I
~
2"
BlK
Detail
7A
Detail
78
4"
I
3"
RE
D
5"
I
Page
13
OP
OF
CHASS I 5
I
1"-
I
r-sLK"1
6"
I
Page
14
SWITCH
PREWIRING
PART
PARTS
No.
Per
Kit
RESISTORS
(1)1-83 1
1-84
1
1-66
1
1-94
1
1-63
2
1-131
1
1-96
1
1-97
5
1-98
5
1-89
1
1/2
Wcrtt.
1%
(2)2-249 2
2-248
2
2-247
2
2-50
2
2-97
2
2-98
2
2-99
2
2-11
2
CAPACITORS
1
1
HEATHXJ:T®
PARTS
LIST
Open
package
#3 and
check
each
part
against
the
following
Parts
List.
The
numbers
inparen-
theses
correspond
to
the
numbers
on
the
Parts
Pictorial
(fold-out
from
Page
6).
DESCRIPTION
PART
PARTS DESCRIPTION
No.
Per
Kit
Capacitors
(cont'
d.
27-83
1
56 n
(green-blue-black)
(5)27-82 1
62 n
(blue-red-black)
27-81 1
150 n
(brown-green-brown)
390 n
(orange-white-brown)
510 n
(green-brown-brown)
620 n
(blue-red-brown)
SWITCHES-CONTROL
NUT
750 n
(violet-green-brown)
1100 n
(brown-
brown-
red)
(6)63-485 1
8-position
rotary
with 5000
[I
1600 n
(brown-bIue-red)
control
2400 n
(red-yellow-red)
(7)63-486 1
3-position
rotary
with 400
[I
control
(8)63-487 2
11-position
rotary
(9)63-488
1
4-position
rotary
2500 n (2.5
kn)
(10)252-7 1
Control
nut
3300 n (3.3
kn)
5000 n
(5
kn)
10 kO
25
kn
33.3
kn
WIRE
50
kn
100
kn
344-50
1
Black
wire
344-51 1
Brown
wire
344-53
1
Orange
wire
344-54
1 Yellow
wire
344-55
1
Green
wire
500
pF
344-56
1
Blue
wire
.005
p.F
344-59
1 White
wire
15
Page
16
STEP-BY-STEP
ASSEMBLY
All of
the
rotary
switch
wafers
have
twelve
lug
locations,
numbered
1
through
12. In
some
switches
not
all
twelve
locations
are
but
each
location
will
still
be
numbered.
numbering
runs
clockwise
as
viewed
from
knob end of
the
switch.
The
switch
wafers
are
designated
"FIT
for
front
and
"R"
for
rear.
for
example,
is
lug
number
2
onthefront
For
your
wiring
each
switch
will
be
temporarily
mounted
to
the
chassis
while
it
is
prewired.
MUL
TlPLIER
SWITCH
Refer
to
Pictorial
8
for
the
following
steps.
( )
Refer
to
Detail
8A and mount
the
4-position
rotary
switch
(#63-488)
in
chassis
hole
L.
Use
a
control
nut.
Turn
the
nut
down only
finger
tight.
Detail
SA
Connect
the
components
and
wires
to
the
Multi-
plier
switch
as
directed
in
the
following
steps.
NOTE:
Either
end of
the
followingfive
capacitors
may
be
connected
to
either
the
front
or
rear
wafer.
( )
Connect
a
.5
f.LF
capaCitor
from
lug
F2
(8-1) to
lug
R2
(8-1).
( )
Connect
a 5
f.LF
capacitor
from
lug
F1
(8-1)
to
lug
Rl
(8-1).
1
-l/
2"
WHT
MULTIPLIER
SWITCH
(63-466)
r!i'b
PICTORIAL 8
9"
ORG
)
Connect
a
.05
f.LF
calt:l<lC~1tc,r
from
lug
F3
(8-1
to
lug
R3 (8-1).
Connect
a .005
f.LF
Call1a(~it()r
(8-1)
to
lug
R4 (8-1).
from
lug
F,
Connect
a
500pF
calpac~itc,r
from
lug
F5
(8-1
to lug R5
(S-l).
Prepare
thE~
fClllc}wing
lelogths ofhookup wire
1-1/2"
white
9"
orange
( )
Connect
one
end
of
the
1-1/2"
white wirl
to
lug
F7
the
other
end
will
be
con·
nected
later.
Connect
one
end
of
the
9"
orange
wire
t
lug
Fll
(8-1);
the
other
end
will
be
con
nected
later.
This
completes
the
prewiring
of
the
Multiplie
switch.
Remove
the
switch
from
the
chassis
an
inspect
your
work.
All
of
the
lugs
onboth
wafer
should
be
soldered
except
lugs
R7
and
Rll
whic
will
be
used
later.
Set
the
switch
aside
until
'
is
called
for
later.
TENS FREQUENCY SWITCH
Refer
to
the
top view
of
Pictorial
9
(fold-out
from
this
page)
for
the
following
steps.
( )
Fasten
an
ll-position
rotary
switch
(#63-
487) in
chassis
hole
L.
Use a
control
nut
turned
down
finger
tight.
Refer
to
the
lugs
on
the
rear
wafer
for
proper
positioning
of
the
switch.
NOTE: Use
1%
resistors
in
the
following
steps.
Center
each
resistor
between
the
wafers
before
soldering.
( )
Pass
one
lead
of a 3300 n (3.3 kQ)
resistor
through
lug
R5 (N8). Bend
the
lead
so
it
lies
beside
lugs
R6
(N8)
and
R7 (N8);
then
connect
the
end to
lug
R8
(N8).
Do
not allow
the
lead
to
touch
the
switch
spacer
post
or
the
nut.
( )
Connect
the
other
lead
of
this
resistor
to
lug
F5
(8-1).
NOTE:
Where
a
wire
passes
through
a
connection
and
then
goes
to
another
point
(or
passes
beside
the
connection
and
comes
in
contact
with it),
it
will
count
as
two
wires
in
the
solder
instruc-
tions
(8-2),
one
entering
and
one
leaving
the
connection.
( ) Connect one
lead
of a 2500 Q (2.5 kQ)
rE;ls~stor
to
lug
F6
(8-1).
Insert
the
other
lead
through
lug R6 and
around
the
wire
passing
by R6 (8-3).
Connect
a 10
kn
resistor
from
lug
F7
(8-1)
to
lug
R7
(8-3).
( )
Connect
a 5000 Q
(5
kQ)
resistor
from
lug
F8
(8-1)
to
lug R8 (N8). Be
sure
to
solder
both
lugs
at
F8.
Refer
to
the
bottom
view of
Pictorial
9
for
the
following
steps.
( )
Pass
one
lead
of a 3300 Q (3.3 kQ)
resistor
through
lug
Fll
(N8). Bend
the
lead
so
it
lies
beside
lugs
F12
(N8)
and
Fl
(NS);
then
con-
nect
the
end
to lug
F2
(N8).
Now
solder
lug
Fll
(8-2).
1"
I
2"
I
Page
17
( )
Connect
the
other
lead
of
this
resistor
to
lug
Rll
(S-1).
Connect
a 2500 n (2.5
kQ)
resistor
from
lug F12 (8-3)
to
lug R12 (8-1).
Connect
a 10
kn
resistor
from
lug
Fl
(8-3)
to
lug
R1 (8-1).
( )
Connect
a 5000 Q
(5
kQ)
resistor
from
lug
F2
(N8)
to
lug
R2 (8-1).
80lder
both
lugs
at
R2.
( )
Prepare
the
wire:
2"
brown
5"
brown
3-1/2"
yellow
3"
yellow
2-1/2"
yellow
Connect
the
2"
brown
(8-3)
and
R5 (N8).
( )
Connect
one
end
lug R5 (8-4),
The
will
be
connected
lengths
of hookup
between
lugs
F2
5"
brown
wire
to
end of
this
wire
NOTE: In
the
next
POSitiOIl
tl1te
three
yellow
wires
as
shown
in
Pictorial
9.
( )
Connect
one ,
the
2-1/2",
and
the
3"
wires
to lug RIO (8-3).
Solder
both
The
free
ends of
these
wires
will
be
connected
later.
This
completes
the
prewiring
of
the
Tens
Fre-
quency
switch.
All
should
be
soldered
except
the
lugs
at
F4
have nothing
connected
to
them
and lug R8 which
has
a 5000 n
resistor
and
a
wire
attached
to
it.
These
lugs
will
be
wired
to
and
soldered
later.
Remove the
switch
from
the
chassis
and
set
it
aside
until
it
is
called
for
later.
4"
!
5"
l
6"
I
PICTORIAL
7
TENS
FREQUENCY
SWITCH
(63-487)
TOPVIEW
BOTTOM
VIEW
PICTORIAL
9
3"
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