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When
you have
mounted
alL toroids,
check
that the wire is
tight at all points.
Then pass
the free
end up through hole
BB
at the right
end
of the toroid
row and
tie a
second knot
on
the top side of the
board.
10.
Next
to
each
toroid are
two
hotes,
designated
St
and
SZ
in
Figure 5.2. A
secondary
coil is
wound
on each
toroid
and
connected
to
these holes.
Lay
the
board on
the
bench,
printed side
down,
with the toroids
away
from
you.
Scrape
the insulation
from one end of,
a
10'r
length of
/t30
magnet
wire. Insert the wire
through
hole
32
near toroid
T6 and
solder it to the
pad
on
the
bottom
of
the
board.
Return
the
board
to its former position
and pass the
wire
through
the center hole of toroid Tg. Bringing the
end
of the wire
tor^7ard
you,
wrap
it
around
the toroid
body and
pass
it
through
the hole in the toroid again.
Continue
winding turns
in this
manner,
working up the side of the toroid nearest
you,
as
shown
in Figure 5,4.
Make
sure that the turns are closely
spaced.
When
you have completed
the fifteenth turn,
pass
the
free
end
of the wire
dovm
through
hole 51. Cut the wire off,
leaving
about
Lot'
protruding
from
the
bottom
side of the board.
Remove
the wire
from
the hole
and scrape
the
enanel from
the end.
Re-
insert the wire
through
hole Sl
and
pult it snug.
Check
that
the turns
on
the toroid are positioned property
and
are tight.
Then
solder the wire to the
pad
on
the
bottom
of the
board.
Wind secondaries on
toroids
T1 through T6
by repeating
the
process.
Be
sure to follow the
same
procedure
so that
the
windings
wilt
have
the proper polarity.
11. Next
mount
the keyswitches.
Note
that
some
of the
modutes
contain five
switches
while others contain four. Figure
5.2
shows how
the
modules
should be arranged on
the
board.
Select
one
of the
f
ive-switch modules. t'rrsett it at position
A,
pushing
it in only far
enough
that the
mounting
screws
enter the holes in the board,
Look under
the switch
module
to
see
if a1t pins line
up
with the holes in the board. If
they donrt,
use
a smatl
needle-nose
pliers or a
screwdriver
to gently
bend
the pins into
alignment
with the
holes.
Carefutly
push
the switch
module down
until the
body rests
against the board,
Turn
the
board over and check
that all
10
switch pins protrude
through
the board.
Then
fasten
the
module
to the
board
with
two 2-56 screws and hex nuts.
Mount
the
remaining switch modules, one
at a time, r€ferring
to Figure 5.2 for proper positioning.
When
all
modules are
mounted,
solder all pins to the circuit
board.
18
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