Re: Capacitor Question

From	Fabian Russell <root@localhost.localdomain>
Newsgroups	sci.physics
Subject	Re: Capacitor Question
Date	2015-11-05 00:28 +0000
Organization	NewsGuy - Unlimited Usenet $23.95
Message-ID	<pan.2015.11.05.00.28.32@localhost.localdomain> (permalink)
References	(7 earlier) <5o8qgc-29k.ln1@mail.specsol.com> <pan.2015.11.04.21.53.14@localhost.localdomain> <gtcqgc-mok.ln1@mail.specsol.com> <pan.2015.11.04.22.43.07@localhost.localdomain> <imfqgc-l0l.ln1@mail.specsol.com>

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On Wed, 04 Nov 2015 23:07:30 +0000, jimp wrote:

> 
> The way to fix the problem is to first measure what the load, i.e. the
> headphone and all the cable, presents to the amplifier.
> 

Correct.  But trial and error can be effective as well.

I had a similar problem once before.  I used a home-built 50 Watt
amplifier to power some home-built speakers on very long leads.
There was never any problem.

However, one day I hooked up some commercial speakers (older ones
I had in storage) and above a certain output level oscillations
would occur.  I placed some high current inductors between output
and load and the problem was solved.

I strongly suspect that a simple filter between output and load
will do the trick in solving my latest issue as well.

> Then build a spice model of the amplifier with the load and run a
> transit analysis.
> 
> That should tell you what you need to do.
> 
> Decades ago I was involved in the development of wire guided torpedoes.
> 
> When tested, guidance always failed.
> 
> Long story short, the actual impedance of the load as the wire spooled
> out was measured and found to be a complex spiral when plotted on a
> Smith chart. The driver amplifier had to be totally redesigned to drive
> that load.

Thread

Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-03 22:14 +0000
  Re: Capacitor Question gilber34 <fafa@invalid.com> - 2015-11-03 16:35 -0600
    Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-03 22:59 +0000
      Re: Capacitor Question gilber34 <fafa@invalid.com> - 2015-11-03 18:10 -0600
  Re: Capacitor Question jimp@specsol.spam.sux.com - 2015-11-03 22:47 +0000
    Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-03 23:07 +0000
      Re: Capacitor Question jimp@specsol.spam.sux.com - 2015-11-03 23:20 +0000
        Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-03 23:42 +0000
        Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-04 02:49 +0000
          Re: Capacitor Question gilber34 <fafa@invalid.com> - 2015-11-03 21:40 -0600
            Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-04 04:01 +0000
              Re: Capacitor Question jimp@specsol.spam.sux.com - 2015-11-04 06:03 +0000
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-04 07:07 +0000
                Re: Capacitor Question jimp@specsol.spam.sux.com - 2015-11-04 20:29 +0000
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-04 20:51 +0000
                Re: Capacitor Question jimp@specsol.spam.sux.com - 2015-11-04 21:08 +0000
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-04 21:53 +0000
                Re: Capacitor Question jimp@specsol.spam.sux.com - 2015-11-04 22:20 +0000
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-04 22:42 +0000
                Re: Capacitor Question jimp@specsol.spam.sux.com - 2015-11-04 23:07 +0000
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-05 00:28 +0000
                Re: Capacitor Question jimp@specsol.spam.sux.com - 2015-11-05 00:46 +0000
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-05 00:39 +0000
                Re: Capacitor Question jimp@specsol.spam.sux.com - 2015-11-05 00:58 +0000
                Re: Capacitor Question benj <none@gmail.com> - 2015-11-04 18:25 -0500
                Re: Capacitor Question benj <none@gmail.com> - 2015-11-04 18:37 -0500
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-05 00:09 +0000
                Re: Capacitor Question benj <nobody@gmail.com> - 2015-11-04 21:35 -0500
                Re: Capacitor Question gilber34 <fafa@invalid.com> - 2015-11-04 21:51 -0600
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-05 04:19 +0000
                Re: Capacitor Question gilber34 <fafa@invalid.com> - 2015-11-05 11:10 -0600
                Re: Capacitor Question "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-11-05 09:15 -0800
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-05 18:08 +0000
                Re: Capacitor Question jimp@specsol.spam.sux.com - 2015-11-05 19:26 +0000
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-05 19:44 +0000
                Re: Capacitor Question jimp@specsol.spam.sux.com - 2015-11-05 19:56 +0000
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-05 20:53 +0000
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-05 21:52 +0000
                Re: Capacitor Question benj <none@gmail.com> - 2015-11-04 18:41 -0500
                Re: Capacitor Question gilber34 <fafa@invalid.com> - 2015-11-04 21:54 -0600
          Re: Capacitor Question benj <nobody@gmail.com> - 2015-11-04 02:17 -0500
            Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-04 07:30 +0000
              Re: Capacitor Question gilber34 <fafa@invalid.com> - 2015-11-04 07:48 -0600
              Re: Capacitor Question benj <nobody@gmail.com> - 2015-11-04 14:04 -0500
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-04 19:28 +0000
                Re: Capacitor Question benj <none@gmail.com> - 2015-11-04 18:49 -0500
                Re: Capacitor Question gilber34 <fafa@invalid.com> - 2015-11-04 20:41 -0600
                Re: Capacitor Question Fabian Russell <root@localhost.localdomain> - 2015-11-05 03:16 +0000
                Re: Capacitor Question gilber34 <fafa@invalid.com> - 2015-11-04 21:58 -0600
          Re: Capacitor Question "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-11-04 12:14 -0800
            Re: Capacitor Question benj <none@gmail.com> - 2015-11-04 18:44 -0500
              Re: Capacitor Question gilber34 <fafa@invalid.com> - 2015-11-04 20:41 -0600
  Re: Capacitor Question gyansorova@gmail.com - 2015-11-05 16:34 -0800

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