Groups > sci.electronics.design > #462169

Re: Running out of ideas: stability, bootstrap

From	Jan Panteltje <pNa0nStpealmtje@yahoo.com>
Newsgroups	sci.electronics.design
Subject	Re: Running out of ideas: stability, bootstrap
Date	2017-05-29 15:36 +0000
Organization	Aioe.org NNTP Server
Message-ID	<oghf6q$m18$1@gioia.aioe.org> (permalink)
References	<ep07lpF4vr5U1@mid.individual.net> <oghbkp0nh7@drn.newsguy.com> <g%WWA.109122$Qg.95262@fx14.iad>

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On a sunny day (Mon, 29 May 2017 11:20:44 -0400) it happened bitrex
<bitrex@de.lete.earthlink.net> wrote in <g%WWA.109122$Qg.95262@fx14.iad>:

>On 05/29/2017 10:36 AM, Winfield Hill wrote:
>> Gerhard Hoffmann wrote...
>>>
>>> Some observations:
>>>
>>> - Zin is negative also with the feedback loop cut
>> 
>>   I think you could safely add a little resistance
>>   in Q3's emitter.  BTW, while studying the Zin
>>   scene, you can make changes that would damage
>>   the noise performance, just saying.
>> 
>> 
>
>If you have a chance could you confirm and/or deny that there might be a 
>problem with the feedback connection from Q3's collector to U1A? It 
>looks that way to me or else I'm not understanding correctly how this 
>circuit is supposed to work, which is entirely possible given it's still 
>before noon ;-)

I looked at it twice and declined to comment as I 
1) have no idea what it does.
2) have no idea what it is supposed to do.
3) have no idea why make a peeseebee for something that one has not tested.
4) looks overly complicatiaotiantiated to me, brain abort.

Thread

Running out of ideas: stability, bootstrap Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2017-05-28 17:11 +0200
  Re: Running out of ideas: stability, bootstrap bitrex <bitrex@de.lete.earthlink.net> - 2017-05-28 12:09 -0400
    Re: Running out of ideas: stability, bootstrap Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2017-05-28 23:01 +0200
      Re: Running out of ideas: stability, bootstrap Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-05-28 14:30 -0700
        Re: Running out of ideas: stability, bootstrap Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2017-05-28 23:56 +0200
          Re: Running out of ideas: stability, bootstrap Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-05-28 15:08 -0700
  Re: Running out of ideas: stability, bootstrap John Larkin <jjlarkin@highlandtechnology.com> - 2017-05-28 09:46 -0700
    Re: Running out of ideas: stability, bootstrap Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2017-05-28 22:09 +0200
      Re: Running out of ideas: stability, bootstrap Joerg <news@analogconsultants.com> - 2017-05-29 07:13 -0700
        Re: Running out of ideas: stability, bootstrap dagmargoodboat@yahoo.com - 2017-05-29 20:56 -0700
          Re: Running out of ideas: stability, bootstrap Winfield Hill <hill@rowland.harvard.edu> - 2017-05-30 03:55 -0700
            Re: Running out of ideas: stability, bootstrap Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2017-05-30 15:53 +0200
              Re: Running out of ideas: stability, bootstrap dagmargoodboat@yahoo.com - 2017-05-30 10:42 -0700
  Re: Running out of ideas: stability, bootstrap bitrex <bitrex@de.lete.earthlink.net> - 2017-05-29 08:38 -0400
    Re: Running out of ideas: stability, bootstrap bitrex <bitrex@de.lete.earthlink.net> - 2017-05-29 08:40 -0400
    Re: Running out of ideas: stability, bootstrap Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2017-05-30 16:51 +0200
  Re: Running out of ideas: stability, bootstrap Winfield Hill <hill@rowland.harvard.edu> - 2017-05-29 07:36 -0700
    Re: Running out of ideas: stability, bootstrap bitrex <bitrex@de.lete.earthlink.net> - 2017-05-29 11:20 -0400
      Re: Running out of ideas: stability, bootstrap Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-29 15:36 +0000
        Re: Running out of ideas: stability, bootstrap bitrex <bitrex@de.lete.earthlink.net> - 2017-05-29 11:44 -0400
          Re: Running out of ideas: stability, bootstrap bitrex <bitrex@de.lete.earthlink.net> - 2017-05-29 11:53 -0400
          Re: Running out of ideas: stability, bootstrap Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-29 17:01 +0000
        Re: Running out of ideas: stability, bootstrap Winfield Hill <hill@rowland.harvard.edu> - 2017-05-29 08:46 -0700
          Re: Running out of ideas: stability, bootstrap Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-05-29 16:56 +0000
      Re: Running out of ideas: stability, bootstrap dagmargoodboat@yahoo.com - 2017-05-29 21:12 -0700

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