12
The remaining two inductors on the Filter board, T1 and T2, both use the two-layer winding shown in
Figure 6a. The 16-turn winding will be completed first, then the 8-turn winding will be wound over about
half of it. The 8-turn winding should interleaved with the 16-turn winding as shown. Figure 6b shows lead
2 folded down in preparation for stripping and tinning.
Cut two 12" (30 cm) lengths of
red
enamel wire, and two 8" (20 cm) lengths of
green
.
Start with T1. The first winding uses 16 turns of red enamel wire, covering about 90% of the core.
Re-check the number of turns on the first winding. Also check the winding sense (direction): lead 4
must terminate on the top side of the core, and lead 3 on the bottom.
Heat-strip and tin leads 3 and 4.
The second winding uses 8 turns of green enamel wire. Start just to the left of lead 4, working
counter-clockwise and covering about half of the first winding.
Leave lead 2 long--about 1" (25 mm).
Re-check the turns count and sense of this winding. Lead 1 terminates on the top, 2 on the bottom.
Fold lead 2 down behind the core as shown in Figure 6b, then prepare tin leads 1 and 2 as before.
Note: Lead 2 should be stripped and tinned over just the portion needed for installation.
Install T1 vertically as indicated by its component outline, near trimmer capacitor C5. Be very careful
to insert the leads into their associated numbered holes. Solder and trim the leads.
Wind transformer T2 in the same manner as T1. Double-check the turns count and winding sense.
Install T2 in its indicated position near C6. Solder and trim the leads.
