Heathkit SB-10 User Manual

A,
-P,oor
solde-r
joint
will usually
be indicated by its
appearance.
The solder
will stand up in
a
orob
on
top
of
the
connection
with
no
evidence
of flowing
out
caused
by
actual
"wetting"
of
the
9o_nta_ct'
A
crystalline
or
grainy
texture
on the solder
surface,
cauied
by movement
of the
joint
before
it solidified
is
another evidence
of a
"cold"
connection.
In
either event,
reheat
the
joint
until
the solder
flows
smoothlyover
theentire
junction,
cooling
to a smooth,
bright appear-
ance. Illustrations
below
clearly indicate
these
two characteristics
COLD
SOLDER
JOINT
CONNEC
TION
INSUF
F IC
IENTLY
HEATED
PROPER,
SOLDER
CONNECTION
COLD
SOLDER
JOINT
CONNECTION
MOVED
WHILE
COOLING
A
good,
clean,
well-tinned
soldering iron is
also important
to obtain
consistently perfect
con-
nections.
For
most \piring,
a 60 or 100 watt iron, or
the
equivalent
in a
soldering
gun,
rs very
satisfactory.
SmaIIer irons
generally
will not heat the
connections
enough
to flow
the solder
smoothly
over the
joint
and
are
recommended
only'for
light
work,
such
ls on
etched circuit
boards,
etc.
Keep the
iron tip
clean and bright. A
pad
of
steel
wool mav
be used
to
wi.De
the
tip
occasionally
during
use.
Take these
precautions
and
use reasonable care
during
assembly
of the
kit.
This
witl insure the
wonderful
satisfaction
of
having the
instrument operate
perfectly
the
first
time it
is turned on.
NOTES ON WIRING
Read
the notes
on soldering
and wiring
on the inside
rear
cover.
Crimp
all leads
tigh
y
to the
terminal
before soldering.
Be sure
both theleadand termina-l
are
freeof
wax.
corrosion or other
foreign
substances.
Use only
the best
rosin
core
solder,
preferably
a type
containing the new
activiated
fluxes
such
as Kester
"Resin-Five",
Ersin
"Multicore"
or similar
tlpes.
Unless
otherwise
indicated,
all vrire used
is insulated,
Wherever
there is
a
possibility
of the
bare leads
on resistors
and
capacitors
shorting
to
other
parts
or to
chassis, the
leads should be
covered
with insulated sleeving.
This is indicated
in
the instructions
by the
phrase
"use
sleev-
ing". Bare
wire isused
wherethe lead lengths
are
short
and the
possibitity
of short
circuits are
non-
existent.
Leads
on
resistors,
capacitors
and
transformers
are
generally
much
longer
than
they
need to
be to
make the indicated
connections,
In
these
cases, the
excess leads should
be
cut off before
the
part
is
added to
the
chassis.
In general,
the leads should
be
just
Iong enough
to
reach
their
terminating
points.
Not
only
does
this
make
the wiring much neaier
lut in
many instances,
the
excessively
long
leads
will
actually
interfere
with
proper
operation
of the instrument.
The
pictorials
indicate
the
actuai
chassis
wiring and designate
values of component
parts.
we
very strongly
urge
that
the
chassis
layout,
lead
placemenfand
grounding
connections
be
followed
exactly
as
shown'
While
the
arrangement shown
is
probably
tt6t
tnu
ont=y satisfactory
layout,
it
is
the result
of
considerable
experimentation
and trlal. A
common factor
of radio
frequency
:^1".1T
":t
is
the
cr_itical
placement
of leads
and components.
The
lead dress
shown
in
the
pic-
to-rPls
should
be
followed
carefully
to insure
the most stable,
accurate
anddependable
ope"ation
of
the
adaoier.
Page
11

Heathkit SB-10 Specifications

General

Brand	Heathkit
Model	SB-10
Category	Adapter
Language	English