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QAMP-40 • 10
We're almost finished. All we need to do now is install a few remaining parts that
have to be handmade - for that "old-world craftsmanship" touch! We'll prepare all
those parts now for further assembly. We give you plenty of enameled wire, but if
you mess up, you can get a whole 50' spool of it from Radio Shack (278-1341).
41. Winding L1 and L3 toroid RF coils (two identical units ): Locate 2 of the
donut shaped yellow toroid cores provided in the kit. Cut 12" of the
enameled magnet wire and, following the drawing, thread the wire
through the core 19 times - not 18, not 20; it MUST be 19 times through
the core, pulling each turn gently
tight. Winding too tightly runs the risk of
scraping off the enamel insulation and shorting the wire. Tin each end
with solder by holding your soldering iron and solder the wire ends until
the insulation melts away and the copper wire underneath coats nicely
with solder. Tin all the way up to the toroid core body.
42. Winding L2: Locate the remaining yellow toroid core and cut 15" of the
enameled magnet wire. Wind 22 turns through the core using the same
procedure as above. Tin the wire ends as before. Mark this part with a
piece of tape, a dab of paint or a magic marker. We don't want to
confuse it with the other two toroid coils wound just before!
43. Winding T2: Locate the smaller of the two 2-hole ferrite cores. Cut off
one 11 inch length of enameled magnet wire and thread the wire through
the core 6 times, pulling each turn gently
tight. That's 6 times through
each hole, resulting in 6 complete whole turns through the core. Be
especially careful not to strip the insulation by pulling too tightly around
the core.The amount of wire cut for this task is the proper amount. If you
have too little or too much, then you have not wound the core correctly.
19 turns through center of core
IMPORTANT:
Loop the first winding
through the front of the
core as shown.
22 turns through center of core
Loop the first winding
around the front of the
core as shown.
IMPORTANT: