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Old 21st July 2012, 10:39 PM   #201
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Not inverting if you hook it up as laid out....

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Old 21st July 2012, 10:54 PM   #202
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Nelson Pass View Post
Not inverting if you hook it up as laid out....

ehh, because input ground resistor connects to -out, I guess
but with +out connected to ground/chassis, strange thing

ehh, input cap C3 is also a polar electrolytic cap
well, it is according to parts number
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Old 21st July 2012, 11:11 PM   #203
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Picky Picky....

It's a silk electrolytic. Measures and sounds better than a
lot of film caps.

And you can't get a tube or a transistor to give you voltage gain and
not have inversion somewhere unless you introduce the dreaded
transformer. Non-inverting amplifiers with voltage gain simply find
some way to flip the phase an even number of times. In this amp,
the second time is at the output terminals.

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Old 21st July 2012, 11:18 PM   #204
tinitus is offline tinitus  Europe
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my brain says bedtime
thanks Nelson
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Old 22nd July 2012, 02:54 AM   #205
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I made an error - of course you can get voltage gain without inversion,
simply use Common-Base operation.

Doh!

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Old 22nd July 2012, 11:22 AM   #206
tinitus is offline tinitus  Europe
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Originally Posted by Nelson Pass View Post
Doh!

its ok, noones perfect

I suppose using matched outputs are more or less standard now ?
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Old 22nd July 2012, 12:33 PM   #207
flg is offline flg  United States
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Quote:
Originally Posted by Nelson Pass View Post
The mu follower has a relatively high DC impedance, but it is an active
component with an AC negative resistance. It contributes to raising the
apparent output impedance of the amplifier.
I am confused by these statements
If it is "an active component with an AC negative resistance" how can it's contibution be higher impeadance? It's negative, simply speaking, thats lower.
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Old 22nd July 2012, 01:24 PM   #208
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Quote:
Originally Posted by Nelson Pass View Post
Picky Picky....

It's a silk electrolytic. Measures and sounds better than a
lot of film caps.

And you can't get a tube or a transistor to give you voltage gain and
not have inversion somewhere unless you introduce the dreaded
transformer. Non-inverting amplifiers with voltage gain simply find
some way to flip the phase an even number of times. In this amp,
the second time is at the output terminals.

Silk is a protein and a poor conductor of electricity; albeit polar [compared to polypropylene], and thus polarizable [via voltage]. It has amino acids in its primary polymeric structure which do not have extra [basic] amine and [acid] carboxylic groups. These groups react chemically with each other to generate zwitter ions [intra acid-base neutralization] to make the ionic ammonium carboxylate. These ions are electrical dipoles which will cause the dreaded dielectric absorption [of acoustic energy] which reverts them to the un-neutralized parent. Silk is a great eco-dielectric for high quality electrolytic capacitors.
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Old 22nd July 2012, 01:27 PM   #209
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Quote:
Originally Posted by flg View Post
I am confused by these statements
If it is "an active component with an AC negative resistance" how can it's contibution be higher impeadance? It's negative, simply speaking, thats lower.
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Old 22nd July 2012, 01:34 PM   #210
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Quote:
Originally Posted by flg View Post
I am confused by these statements
If it is "an active component with an AC negative resistance" how can it's contibution be higher impeadance? It's negative, simply speaking, thats lower.
Of additional interest is an answer/explanation for the amplifier without loop feedback, driven by one complete sinusoidal signal into a load of 8 Ohms. What is its output impedance it experiences along the signal trajectory? Is is a constant 10 Ohms like in the quiescent mode?
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