[DSP-10] Winding Torroids

[dsp-10@mailman.qth.net]

L32  330 mH � 52 turns of #32 enameled wire on an Amidon F-22-43 toroid
core.

L32 is wound with #32 wire and the core is about 1/4 inch in diameter. In
order that this core not behave as an antenna at 15 kHz it needs to be
small
and the magnetic field needs to be concentrated in the core (no air
gaps.)
This is achieved with this coil design, but it does take a few minutes to
wind.  Try to keep the turns in line around the toroid.  But, don't worry
if
the turns sometimes overlap or get looped under the prior turn.  It will
not
affect the functionality.


Toroid Cores
Estimate the amount of wire needed and cut off a little extra. Feed the
wire through the center the same
number of times as there are turns. The turns can be in either direction.
Line the turns up reasonably
close together. If you have the polyurethane covering it is easy to
remove with a soldering iron or with a a
solvent (an example is Belden's Beldsol wire). Otherwise, carefully
remove the enamel with a sharp
knife.
CAUTION: The toroid cores are brittle. Wind carefully. Do not pull the
wire to tight.

 

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