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Groups > sci.electronics.design > #429796
| From | amdx <nojunk@knology.net> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: More inductor talk, Proximity effect, self capacitance |
| Date | 2016-09-29 08:29 -0500 |
| Organization | A noiseless patient Spider |
| Message-ID | <nsj4ur$vda$1@dont-email.me> (permalink) |
| References | <nsh2tn$8cq$1@dont-email.me> <nshgog01bpr@drn.newsguy.com> <nsi0fi$of4$1@dont-email.me> <nsi14m02ici@drn.newsguy.com> <nsit0o$570$1@dont-email.me> |
On 9/29/2016 6:13 AM, amdx wrote:
> On 9/28/2016 10:17 PM, Winfield Hill wrote:
>> amdx wrote...
>>>
>>> Winfield Hill wrote:
>>>> amdx wrote...
>>>>>
>>>>> A fine gentleman did an experiment building two inductors.
>>>>
>>>> What was the SRF for each coil?
>>>
>>> The fine gentleman, who does good work sent back the following.
>>> "I don’t have measured SRF’s. Can’t be measured on a Q meter.
>>> But, you can calculate SRF’s from L (true value) and Co.
>>> For these coils:
>>> Closewound: L = 214.8 uH; Co = 7.7 pF; SRF = 3.91 MHz
>>> Spaced: L = 187.2 uH; Co = 6.9 pF; SRF = 4.43 MHz."
>>
>> A Q meter is not needed. A common reason for measuring
>> SRF is to see the measured capacitive parameter values.
>>
>>
>
> The fine gentleman must have calculated the capacitance.
> A program often used to calculate it is here.
>
>> http://electronbunker.ca/Extras/Downloads/LoopSelfCap_r1c.xls
>
> The program uses The Least Squares Method.
>
> Mikek
>
Here's paper,
The self-resonance and self-capacitance of solenoid coils:
> http://www.g3ynh.info/zdocs/magnetics/appendix/self_res/self-res.pdf
It's mostly over my head, has some neat pictures showing nodes with a
mercury tube.
Pages 39, 41, and 98 discuss self cap. page 77 is on SRF and page 101,
is a summary.
Mikek
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More inductor talk, Proximity effect, self capacitance amdx <nojunk@knology.net> - 2016-09-28 13:42 -0500
Re: More inductor talk, Proximity effect, self capacitance boB <boB@theresnoplacelikehome.com> - 2016-09-28 14:08 -0700
Re: More inductor talk, Proximity effect, self capacitance amdx <nojunk@knology.net> - 2016-09-28 17:06 -0500
Re: More inductor talk, Proximity effect, self capacitance "Tim Williams" <tiwill@seventransistorlabs.com> - 2016-09-28 23:50 -0500
Re: More inductor talk, Proximity effect, self capacitance boB <boB@theresnoplacelikehome.com> - 2016-09-28 22:27 -0700
Re: More inductor talk, Proximity effect, self capacitance amdx <nojunk@knology.net> - 2016-10-03 15:46 -0500
Re: More inductor talk, Proximity effect, self capacitance Winfield Hill <hill@rowland.harvard.edu> - 2016-09-28 15:38 -0700
Re: More inductor talk, Proximity effect, self capacitance amdx <nojunk@knology.net> - 2016-09-28 19:16 -0500
Re: More inductor talk, Proximity effect, self capacitance amdx <nojunk@knology.net> - 2016-09-28 22:06 -0500
Re: More inductor talk, Proximity effect, self capacitance Winfield Hill <hill@rowland.harvard.edu> - 2016-09-28 20:17 -0700
Re: More inductor talk, Proximity effect, self capacitance amdx <nojunk@knology.net> - 2016-09-29 06:13 -0500
Re: More inductor talk, Proximity effect, self capacitance amdx <nojunk@knology.net> - 2016-09-29 08:29 -0500
Re: More inductor talk, Proximity effect, self capacitance Winfield Hill <hill@rowland.harvard.edu> - 2016-09-29 06:54 -0700
Re: More inductor talk, Proximity effect, self capacitance boB <boB@theresnoplacelikehome.com> - 2016-09-29 11:57 -0700
Re: More inductor talk, Proximity effect, self capacitance Winfield Hill <hill@rowland.harvard.edu> - 2016-09-29 12:29 -0700
Re: More inductor talk, Proximity effect, self capacitance George Herold <gherold@teachspin.com> - 2016-09-29 06:55 -0700
Re: More inductor talk, Proximity effect, self capacitance amdx <nojunk@knology.net> - 2016-09-29 10:59 -0500
Re: More inductor talk, Proximity effect, self capacitance makolber@yahoo.com - 2016-09-29 09:15 -0700
Re: More inductor talk, Proximity effect, self capacitance amdx <nojunk@knology.net> - 2016-09-29 13:16 -0500
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