2.13 Wind and install trifilar toroid T401
This toroid needs some care so please follow these instructions very carefully.
Cut three 20cm lengths of 0.33mm (AWG #28) wire. These three pieces now need to be tightly
twisted together to make the trifilar wire. My method for this is to tie one end in a knot around a
small screwdriver shaft. Similarly tie the other end around another small screwdriver. Now clamp
one end somehow to something solid. You could use a vise, if you have one. If you don’t, then you
have to get creative and think of something. Here I taped it to the edge of the desk. Now you can
twist the screwdriver at the free end, repeatedly until you twist the three wires together thoroughly.
You need to keep the wire under a little tension to keep the twists evenly spaced.
A 20cm length of wire should have about 60 twists. It is not critical.
The end result is something like the photo (right). The measurement scale is in cm.
Now cut off the untidy ends, and this is the piece of wire that will be used to wind the FT37-43
toroidal core as a trifilar transformer.
QMX assembly Rev 1.00e 37
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