inductor calculator

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I have come across an inductor calculator for the zobel network on this forum way back. Life is always like that, when you don't need it, it's flashing up here and there, but when you need it, it's nowhere to be found. Does anyone remember where to find it?
Tks.
 
Here is the calculator
 

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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 .
 
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