inductor calculator

Here is the calculator
 

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    coil.gif
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Hi,

Intervals between turns is the distance centre to cnetre between each turn which cannot be less than the wire diamenter, right?
If the intervals is edge to edge of each turn, then it can be zero.

Even if I plug into 10mm for coil dia. 1.3mm for wire dia. and 0 for gap distance. I still got 10cm, that is still unreasonable.

Just wondering how it is done in quad 303 .