Jon Danniken wrote:
Winston wrote:
Bob Engelhardt wrote:
Winston wrote:
The inductance of that coil fell significantly when you lopped
off the 'I' core, yes?

Yes and no, I supposeG. 'Though I did lop it off, I replaced it
with a shorting bar, so it shouldn't be drastically different.

Now's the time to break out your $0.99 inductance bridge.

I haven't tested this but it looks reasonable:

http://www.aronnelson.com/gallery/main.php/v/BinOfBrett/Inductance_meter.jpg.html

http://www.aronnelson.com/gallery/main.php/v/BinOfBrett/Inductance_method.jpg.html


You can also measure inductances of this size using your PC and tone
generating software. Wire up the inductor with a capacitor, apply the tone,
and look for the resonant frequency.

I did this a few years ago with a MOT, testing the difference in inductance
by using different sized paper shims between the "E" and the "I"
laminations.

There's a webpage describing this somewhere out there, but of course I can't
find it right now. I think I made the mistake of saving it instead of
adding it to my bookmarks.

Bob's soundcard software looks promising.
For 29 bucks, it is worth trying IMHO.

http://www.daqarta.com/dw_0ass.htm

--Winston