Heathkit
Page 41
Refer to
Pictorial
2-7
(Illustration
Booklet, Page
14)
for
the following steps.
(
)
Refer to
Detail
2-7A (Illustration Booklet, Page
15)
and use the following procedure
to prepare
a transformer:
1.
Cut a
3"
length
of desoldering
braid. Flat-
ten
this desoldering
braid to be sure
there are no
twists in it.
2.
Cut a
10"
length of
small violet solid
wire.
Then
remove
1/8"
of insulation
from one end.
3. Refer to
Part A of the
Detail and solder
the
bare end of the
violet wire to the
side
of, and
1"
away from, one end of the de-
soldering braid. Then bend
the desolder-
ing braid in
half as shown.
4.
Refer to Part B of the
Detail and insert
the ends
of the desoldering braid
through the
holes
in a
ferrite core. The
solder connection for the
violet wire
should
be at the left end of the
indicated
hole in the
ferrite
core.
5. Push a
round rod (drill bit, etc.) of the
largest
possible diameter (about
1/8")
all
the
way through into (but
not clear
through)
both holes in the
ferrite
core to
compress the
desoldering braid flat
against the
sides of the web (center)
of
the ferrite
core. Then remove the
rod.
NOTE: As you
proceed with the
winding of this
transformer,
continuously push each
wire
against the web
of the
ferrite core. If you do
not do
this, you
will
not
be able to complete
all 6 wraps. Use
progressively
smaller rods.
You can use
the large bare wire
supplied with
this kit to push the
last two turns against the
ferrite
core.
6.
Refer again to
Part B of the Detail and
proceed
with the winding
of the trans-
former. Wrap the
violet wire around
the
web
(through both holes)
of the ferrite
core.
7. Refer to
Part
C
of the
Detail and finish
wrapping the 6
wraps of violet
wire
(5
wires
at the bottom and
6 wires at the
top) on the
ferrite core. When you
com-
plete the 6
wraps,
there should not be
enough
violet wire left to make
another
complete wrap.
8.
Refer again to Part C of the
Detail and
remove all but
1/8"
of
insulation from the
end of the
violet wire at the bottom
of
the
ferrite core. Set the
completed trans-
former aside
temporarily.
(
)
Use the same
procedure to make
another trans-
former
identical to the one you just
completed.
*
Set the completed
transformer aside
temporar-
ily.
(
)
T404: Install one
of the prepared transformers
in the circuit board at T404.
Start the leads
of
the transformer into their corresponding
cir-
cuit board
holes
as
shown in Detail 2-7B (Illus-
tration Booklet, Page
15).
Then position
the
transformer down against the circuit board
and
solder
the
desoldering braid and wires to
the foil. Use only as much heat as
necessary
to
insure
a good
connection. Cut off any excess
braid or wire lengths.
(
)
T401: Similarly, install the remaining pre-
pared transformer in the circuit board at T401.
(
)
Refer to Detail
2-7C
(Illustration Booklet, Page
15)
and use the following procedure to prepare
transformer T402:
1. Cut an
8"
length of violet solid wire and
a
4"
length of black solid wire.
Do not
remove
any
insulation from
the
ends of
these wires yet.
2. Refer
to
Part A of the Detail and push
one
end of the prepared violet
wire
through the
3/16"
x
3/8"
ferrite bead
until it extends
1"
from
the bead.
Then
wind seven
turns of wire around the
bead. Be sure to pull each turn tight
against the bead. Also be sure each turn
of the wire
does not cross another turn.
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