2.11 Wind and install L502
L502 consists of 10 turns of 0.6mm
(AWG #22) wire wound on an FT37-43
toroid (dull black colour). Firstly, you
have to understand that there’s a right
way and a wrong way to wind a toroidal
inductor, too. The terms “right” and
“wrong” are probably not as appropriate
here, as “handedness” or “winding
direction”. There are two directions you
can wind the toroid. If you choose the
right one, then all the wires will
automatically end up near the holes they
are to be soldered into. If you do it
wrongly, it will be a bit messy.
For all the toroidal inductors in the QMX kit, you will get it right, if you start as shown (photo, above
right) and pass the wire through the toroid from the top side down through the hole, out and then
around and over again; accumulating turns in the anticlockwise direction.
With this in mind, wind 10 turns and install the toroid. As with the output transformer T501, I
recommend scratching the enamel with a knife or wire-cutter, and then cutting it to about 2mm
length on the underside of the board. Then solder, applying the soldering iron for at least 10
seconds and plenty of solder, to ensure a good connection. Do NOT tin the wires before inserting
into the holes: the holes are not large enough to accommodate tinned wires.
QMX assembly Rev 1.00e 35
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