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Re: Experience with Smith Micro?

From J Burns <burns4@nowhere.com>
Newsgroups comp.sys.mac.system, alt.engineering.electrical
Subject Re: Experience with Smith Micro?
Date 2014-02-09 21:01 -0500
Organization A noiseless patient Spider
Message-ID <ld9bu9$lo$1@dont-email.me> (permalink)
References (5 earlier) <h-ydncr4CsadXG_PnZ2dnUVZ_uKdnZ2d@giganews.com> <lcutlf$va7$1@dont-email.me> <k-2dnfBzu9elyGjPnZ2dnUVZ8jadnZ2d@giganews.com> <ld3p6g$3t1$1@dont-email.me> <SalmonEgg-A260CA.15490609022014@news80.forteinc.com>

Cross-posted to 2 groups.

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On 2/9/14, 6:49 PM, Salmon Egg wrote:
> In article <ld3p6g$3t1$1@dont-email.me>, J Burns <burns4@nowhere.com>
> wrote:
>
>> If you need to transfer the most power, matching impedance is important.
>>    If the output circuit has reactive components, matching impedance is
>> important.
>>
>> The amplifier didn't have any capacitors or inductors in the output.
>> Wanting only a few milliwatts from a 50-watt amp, I wasn't worried about
>> power transfer.
>
> First, move responses to alt.engineering.electrical.
>
> Most, should I say all, have large negative feedback. Gain these days is
> cheap. Negative feedback removes distortion arising from nonlinearity of
> the power components in the amplifier.
>
> In particular, voltage feedback makes amplifiers look like low impedance
> sources. Speaker wire resistance adds to the impedance of the effective
> source driving the speaker. Even so, unless there are long runs of
> relatively small speaker wire, that increase in source impedance is
> small. Monster cable is an expensive and unnecessary way of minimizing
> the effective source impedance.
>
> Negative current feedback increases source impedance to where the
> amplifier becomes a constant current source. Any natural vibrations of
> the speaker will not be damped under those circumstances.
>
If the impedance of my phones varied from 20 to 170 ohms depending on 
frequency, I could say a 220-ohm resistor in series had the effect of 
negative current feedback.  With my resistor network, the amplifier saw 
more than 20 ohms, but the phones saw 1.8 ohms, meaning 99.2% less 
negative current feedback than from the standard resistor.

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Thread

Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-04 21:56 -0800
  Re: Experience with Smith Micro? Doug Anderson <ethelthelogremovethis@gmail.com> - 2014-02-04 22:14 -0800
    Re: Experience with Smith Micro? Savageduck <savageduck1@{REMOVESPAM}me.com> - 2014-02-05 05:03 -0800
      Re: Experience with Smith Micro? Doug Anderson <ethelthelogremovethis@gmail.com> - 2014-02-05 06:22 -0800
        Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-05 12:24 -0500
          Re: Experience with Smith Micro? Michelle Steiner <michelle@michelle.org> - 2014-02-05 10:52 -0700
            Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-05 12:53 -0500
            Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-05 13:04 -0500
          Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-05 13:34 -0500
          Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-05 17:48 -0500
          Re: Experience with Smith Micro? Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-02-05 23:40 +0000
            Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-05 20:14 -0500
            Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-05 21:59 -0500
              Re: Experience with Smith Micro? JF Mezei <jfmezei.spamnot@vaxination.ca> - 2014-02-05 22:18 -0500
                Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-05 23:12 -0500
        Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-05 11:02 -0800
          Re: Experience with Smith Micro? Doug Anderson <ethelthelogremovethis@gmail.com> - 2014-02-05 11:16 -0800
            Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-05 17:54 -0500
          Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-05 15:39 -0500
          Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-05 17:53 -0500
            Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-05 21:56 -0500
              Re: Experience with Smith Micro? billy@MIX.COM - 2014-02-06 18:12 +0000
                Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-06 17:59 -0500
                Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-06 18:18 -0800
                Re: Experience with Smith Micro? billy@MIX.COM - 2014-02-07 03:09 +0000
                Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-08 16:51 -0800
                Re: Experience with Smith Micro? billy@MIX.COM - 2014-02-09 03:51 +0000
                Re: soured vibrations J Burns <burns4@nowhere.com> - 2014-02-07 10:10 -0500
                Re: soured vibrations Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-07 16:39 -0800
              Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-07 16:50 -0500
                Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-07 18:11 -0500
                Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-09 15:49 -0800
                Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-09 21:01 -0500
                Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-10 00:26 -0800
                Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-10 11:39 -0500
                Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-10 16:51 -0800
                Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-13 05:48 -0500
                Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-08 22:53 -0800
                Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-09 09:16 -0500
            Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-05 19:16 -0800
              Re: Experience with Smith Micro? JF Mezei <jfmezei.spamnot@vaxination.ca> - 2014-02-05 23:09 -0500
                Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-06 00:27 -0500
                Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-06 01:20 -0500
                Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-08 16:42 -0800
                Re: Experience with Smith Micro? Jim Gibson <jimsgibson@gmail.com> - 2014-02-06 12:38 -0800
              Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-07 16:52 -0500
    Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-05 06:20 -0800
      Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-05 12:13 -0500
        Re: Experience with Smith Micro? Michelle Steiner <michelle@michelle.org> - 2014-02-05 10:47 -0700
          Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-05 11:36 -0800
            Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-05 15:39 -0500
            Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-05 18:10 -0500
              Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-05 22:14 -0500
                Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-07 16:45 -0500
                Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-07 23:38 -0500
                Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-08 09:34 -0500
                Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-09 16:15 -0800
                Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-09 21:52 -0500
        Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-05 11:22 -0800
          Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-05 15:39 -0500
            Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-05 18:36 -0800
              Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-05 21:43 -0500
        Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-05 18:04 -0500
          Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-05 18:19 -0500
            Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-05 21:03 -0500
              Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-05 21:40 -0500
                Re: Experience with Smith Micro? Savageduck <savageduck1@{REMOVESPAM}me.com> - 2014-02-05 23:21 -0800
                Re: Experience with Smith Micro? android <here@there.was> - 2014-02-06 08:47 +0100
                Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-07 16:55 -0500
                Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-07 18:43 -0500
                Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-07 18:48 -0500
                Re: Experience with Smith Micro? Jolly Roger <jollyroger@pobox.com> - 2014-02-08 02:09 +0000
                Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-07 22:23 -0500
                Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-07 22:23 -0500
                Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-08 09:32 -0500
                Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-08 12:54 -0500
                Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-09 16:32 -0800
                Re: Experience with Smith Micro? JF Mezei <jfmezei.spamnot@vaxination.ca> - 2014-02-09 22:38 -0500
                Re: Experience with Smith Micro? JF Mezei <jfmezei.spamnot@vaxination.ca> - 2014-02-07 19:48 -0500
      Re: Experience with Smith Micro? Michelle Steiner <michelle@michelle.org> - 2014-02-05 10:25 -0700
        Re: Experience with Smith Micro? J Burns <burns4@nowhere.com> - 2014-02-05 12:58 -0500
          Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-05 11:48 -0800
        Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-05 13:34 -0500
          Re: Experience with Smith Micro? Michelle Steiner <michelle@michelle.org> - 2014-02-05 12:13 -0700
            Re: Experience with Smith Micro? Doug Anderson <ethelthelogremovethis@gmail.com> - 2014-02-05 11:18 -0800
            Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-05 15:39 -0500
              Re: Experience with Smith Micro? "John Varela" <newlamps@verizon.net> - 2014-02-05 22:34 +0000
                Re: Experience with Smith Micro? Jolly Roger <jollyroger@pobox.com> - 2014-02-05 23:10 +0000
                Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-05 18:19 -0500
                Re: Experience with Smith Micro? "John Varela" <newlamps@verizon.net> - 2014-02-06 23:56 +0000
    Re: Experience with Smith Micro? Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-05 17:45 -0500
  Re: Experience with Smith Micro? Jim Jaeger <jimjaeger@example.com> - 2014-02-04 23:04 -0800
    Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-05 06:28 -0800
      Re: Experience with Smith Micro? Jim Jaeger <jimjaeger@example.com> - 2014-02-05 11:04 -0800
    Re: Experience with Smith Micro? billy@MIX.COM - 2014-02-05 20:47 +0000
  Re: Experience with Smith Micro? Alan Ralph <alan.ralph@gmail.com> - 2014-02-05 18:22 +0000
    Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-08 16:09 -0800
      Re: Experience with Smith Micro? nospam <nospam@nospam.invalid> - 2014-02-08 20:01 -0500
        Re: Experience with Smith Micro? Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-09 16:46 -0800
      Re: Experience with Smith Micro? billy@MIX.COM - 2014-02-09 01:26 +0000
  Re: Experience with Smith Micro? me@home.spamsucks.ca (Kiraly) - 2014-02-05 23:49 +0000
  Re: Experience Smith Micro Progress maybe Salmon Egg <SalmonEgg@sbcglobal.net> - 2014-02-11 15:56 -0800
    Re: Experience Smith Micro Progress maybe Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-02-11 19:13 -0500

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