Ramsey Electronics AM25, Assembly And Instruction Manual

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AM25
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15
ˆ Winding L4. Locate one of the binocular ferrite cores and the enameled
magnet wire. We will talk about winding complete turns through the core,
a complete turn is a full wire course through one hole in the core and
back out through the other hole.
ˆ 63. Cut a length of wire 18 inches long and following the diagram shown,
wind 2 complete turns through the core and form a loop 3/4 “ long.
ˆ 64. Twist this loop fairly
tight and continue winding
another 8 complete turns
through the core. Leave
this wire end longer than
the first wire, in this way we
will have indicated that this
is the side of the inductor
that has 8 turns. If you
wish, you can play it safe and color this wire with a black marker to really
make it stand out.
ˆ 65. Tin the ends of the wires on L4. Tinning means to ‘burn’ off the
enamel insulation from the ends of the wire and to apply a coat of solder
to the wire to allow a good solder connection. Simply puddle some solder
on the end of your soldering iron and sit the wire in the hot puddle. You’ll
see the insulation burn off and a nice coating of solder attach to the
copper wire under the enamel insulation. Gosh, it takes longer to explain
than to do it!
ˆ
66. Position the wire ends so that the three wires are in line with the
twisted wire pair in the middle.
ˆ
67. Install L4, paying attention to putting the 8 turn wire end into the PC
board hole nearest C1. The twisted wires go in the center hole and the
remaining wire which was 2 turns goes into the hole near C18. It is vitally
important that you properly install this part!
ˆ 68. Winding L6. This inductor is similar to L4, but has a different number
of turns.
ˆ 69. Cut a length of wire 12 inches long and winding as you did before,
wind 2 complete turns through the core and form a loop 3/4 “ long.
ˆ 70. Twist this loop fairly tight and continue winding another 4 complete
turns through the core. Once again, leave this wire end longer than the
first wire to indicate that this is the side of the inductor that has 4 turns.
The marker trick is OK to use here too.
ˆ 71. Tin the wire ends and line them up as you did before with the twisted
pair in the middle.
ˆ 72. Install L6, the 4 turn end installs into the hole near L5, the twisted
pair into the center hole and the 2 turn end faces R16.
Figure 1
Figure 2