Air Core Inductor Dimension Calculator

[lt_texan]

I've been told me to go off and wind my own air core inductor, so this should come in handy on how to do it:

http://colomar.com/Shavano/inductor_info.html

[Paul Barker]

I don't know how they managed to make them so neat.

I found a transformer winding bobbin worked OK.

The number of turns depends on the guage of wire the number of turns per layer (more importantly the width of the lay) and the number of layers (more importantly the diameter of the lay).

If you can wind a narrow width but maximise diameter it takes less turns so your dc resistance is less and capacitance is less. Very high frequency coils are wound in that fashion but also they avoid laying the wire parallel in such a case, wave winding instead with special equipment, so no turn runs alongside another, it crosses the ones below it and above it and is not colse enough to those either side to pick up capacitance. The result is a honeycomb structure. Jumble winding has a similar effect, and in the case of inductors where there is no coupling required between different windings a very good quality choke can be made jumble winding. Uses 50% more wire.