Re: Hand-wound coil in Colpitts oscillator

There's going to be capacitance between the turns, but it will be picofarads rather than nanofarads. You can measure it by measuring resonant frequency of the coil in isolation - exciting it from a variable frequency generator through a judiciously chosen resistor

Thanks for the technique explanation. I guess it is going to be bit too
high resonant frequency to be measurable with anything I have at hand, but
perhaps I can improvise something.

The inductance might increase a thousand times if you found an ungapped pot core pair that could clamp around the core.

Oh, I completely forgotten core should be "closed" (I guess a ring would do
also).
Pieces I used are mainly sticks of old magnetic antennas etc, that's no
good.

Yours is a dumb newbie post - sci.electronics.design is normally populated by people who know a bit more about what they are doing.

That's true, I sincerely apologize and promise to make better attempt next
time, thanks for your patience!
--
to email me substitute github with gmail please