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Groups > sci.electronics.design > #446983
| From | Pimpom <Pimpom@invalid.com> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: Ever heard of this... |
| Date | 2017-02-09 13:05 +0530 |
| Organization | albasani.net |
| Message-ID | <o7h63m$6cs$1@news.albasani.net> (permalink) |
| References | <9s4n9clvnbkhersuoet4si2ak28la2po48@4ax.com> <g-ydnT9t59xwCAbFnZ2dnUU7-TGdnZ2d@supernews.com> <fa6n9cl64o1356n8uk7a0i99fhnsqu6t83@4ax.com> <c46d4e35-f6ed-4cd8-8f42-2d349b75c61b@googlegroups.com> |
On 2/9/2017 7:26 AM, George Herold wrote: > On Wednesday, February 8, 2017 at 5:19:49 PM UTC-5, Jim Thompson wrote: >> On Wed, 8 Feb 2017 17:04:41 -0500, Phil Hobbs >> <pcdhSpamMeSenseless@electrooptical.net> wrote: >> >>> On 02/08/2017 04:58 PM, Jim Thompson wrote: >>>> Ever heard of this... >>>> >>>> Client has issues with audio transformers... at low signal levels they >>>> exhibit roll-off in coupling at low frequencies, like -10dB at 50Hz >>>> >>>> But high signal _levels_ do not. >>>> >>>> Strange? Or a known phenomenon? >>>> >>>> ...Jim Thompson >>>> >>> >>> Sure. Lots of core materials have lower permeability at low flux >>> levels--it's the magnetic version of traps in semiconductors. >>> >>> Cheers >>> >>> Phil Hobbs >> >> So there's no cure? I was pondering current drive, but it doesn't >> sound like that would help? > Knowing little about magnetics, could you turn on some DC bias > at low signal levels? > DC could introduce distortion, maybe more easily than HF AC and will need some tweaking to get the best results It *was* used in many cheap portable tape recorders.
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Ever heard of this... Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-08 14:58 -0700
Re: Ever heard of this... Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-08 17:04 -0500
Re: Ever heard of this... Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-08 15:19 -0700
Re: Ever heard of this... Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-08 17:27 -0500
Re: Ever heard of this... Tim Wescott <seemywebsite@myfooter.really> - 2017-02-08 17:35 -0600
Re: Ever heard of this... pcdhobbs@gmail.com - 2017-02-08 15:52 -0800
Re: Ever heard of this... bitrex <bitrex@de.lete.earthlink.net> - 2017-02-08 19:04 -0500
Re: Ever heard of this... John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-08 17:15 -0800
Re: Ever heard of this... George Herold <gherold@teachspin.com> - 2017-02-08 17:56 -0800
Re: Ever heard of this... Pimpom <Pimpom@invalid.com> - 2017-02-09 13:05 +0530
Re: Ever heard of this... Chris Jones <lugnut808@spam.yahoo.com> - 2017-02-11 01:49 +1100
Re: Ever heard of this... jrwalliker@gmail.com - 2017-02-10 06:59 -0800
Re: Ever heard of this... Joerg <news@analogconsultants.com> - 2017-02-10 07:29 -0800
Re: Ever heard of this... Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-02-10 08:35 -0700
Re: Ever heard of this... Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-10 11:20 -0500
Re: Ever heard of this... John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-10 08:37 -0800
Re: Ever heard of this... makolber@yahoo.com - 2017-02-10 08:48 -0800
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