Path: ...!weretis.net!feeder9.news.weretis.net!i2pn.org!i2pn2.org!.POSTED!not-for-mail From: RodionGork Newsgroups: sci.electronics.design Subject: Re: Hand-wound coil in Colpitts oscillator Date: Sun, 5 May 2024 15:51:28 +0000 Organization: novaBBS Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Info: i2pn2.org; logging-data="171588"; mail-complaints-to="usenet@i2pn2.org"; posting-account="PetDxtfYxGIz8HKnOUw23jUTBLp0s6zcpeRK8b5yfAk"; User-Agent: Rocksolid Light X-Spam-Checker-Version: SpamAssassin 4.0.0 X-Rslight-Posting-User: d7f835980493bcbf332e1f3bae1201d566d49944 X-Rslight-Site: $2y$10$mmINGAAmsWh4L1ct/1b8ceZj4LXypFVyoVNz0yuc8OSqR.yKVj7GC Bytes: 2037 Lines: 24 > 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