David Duxbury wrote:
Scott wrote:
Remember, each time the wire passes through the core is counted as a
turn. In other words, just passing the wire straight through the core
is one turn. 24 gauge wire should be fairly easy to get 40 turns in a
single pass. Toroids are usually wound about 330 degrees around (a 30
degree gap between start and end of winding)...

Hi Scott I have tried and no way can i get 40 turns in without
overlapping, also is it correct to wind on only 80 percent of the core

If you have to overlap turns, overlap adjacent ones, rather than go
with two layers. this lowers the additional inter winding
capacitance. In effect, you get a single layer on the outside of the
core and a double layer on the inside. Have you used the trick of
making a bobbin out of a plastic straw or wood splint and notched the
ends so wire can be wrapped over the ends? It makes it very much
easier to pass a length of wire through the hole, lots of times,
without dragging the whole length through for each turn.

You can also tack each turn down on the outside corners of the core
with a little drop of instant glue, but you have to be really careful
to not glue your fingers to the inductor.

--
John Popelish