Re: [TCML] Flat strip primary inductance

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Finn Hammer wrote:
> Now we know that in the case of 2 turn primary`s, this calculator is 
> accurate (enough).
Certainly and verified by Kurt and myself on real coils. But something 
I've pressed since my own realization, is that as the primary is of very 
few turns or very small, the total inductance tends to a rather small uH 
value. In your case, your heading into less than 1uH. It doesn't take 
much lead length for the lead to become 50% or even double the primary 
inductance. This should be obvious, but it's something that always seems 
to be overlooked until someone points it out. It's just something to 
keep in your mind when measuring small coils. For the normal sizes, the 
lead inductance quickly becomes negligible.

BTW, if you ever do perform the Al foil test I mentioned (quick, easy, 
and fun). Later, cut slits in the foil (say near center outward) and try 
the test again (L won't change). Kind of an interesting measurement to 
make. I did this a few months back during some TSSP correspondence.

Take care,
Bart
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