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Old 8th January 2013, 03:57 PM   #11
GoatGuy is offline GoatGuy  United States
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Note - I redacted my comment. Not ENOUGH coffee this morning! I apologize for the error.
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Old 8th January 2013, 04:14 PM   #12
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:-D
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Old 8th January 2013, 05:21 PM   #13
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Stee View Post

the attenuation factor of the feedback(and vice versa
the correction factor) does not behave as you think
Hi,

It doesn't work the way you think either, your just making up
how it "allegedly works" and ignoring basic feedback theory.

rgds, sreten.
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Old 8th January 2013, 06:32 PM   #14
Stee is offline Stee  Italy
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the proposal will do is conduct a simple experiment: just add a resistor in parallel to the negative feedback of your amplifier
after which a transformer connected in output per channel
someone will write here the result of sound
regards
Stee
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Old 8th January 2013, 06:43 PM   #15
sreten is offline sreten  United Kingdom
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Hi,

I'm not interested in proposals with no theoretical backing.
Or what people who might actually do it would say about it.

There nothing new under the sun in basic feedback theory
and there hasn't been for a long time. This is just some
made up "rule of thumb" of no real practical significance.

rgds, sreten.
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Old 8th January 2013, 08:42 PM   #16
JMFahey is offline JMFahey  Argentina
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Dear Stee, I understand what you are trying to say, but there's some problem, at least on the amp example you show in post #1.
That amp main gain block, T2, has *at least* 50 to even 60 dB gain, and probably much more.
In Lin type amps such as this one, it can surpass 60dB, I calculated "worst case" to get more in line with your theory but even so we still have too much open loop gain.

*There are* amps designed with much lower open loop gain, and even meant to be used with no NFB at all, you'll find many examples, even in DIYaudio itself.
If interested, search around.

As of the output transformer, it's used *after* the output signal is "already made" by the power amplifier, all it does is lower its RMS power by a factor of 6, and the available output voltage by a factor of 2.5 .
It's not involved in NFB or gain at all, it's an external pasive element.
You show separate 8 ohms windings for Tweeter and Woofer, do you intend to connect them straight there, without a crossover or something?
Thanks.

Ps: all this written with the utmost respect, and doubly so because for an Argentine the Caniggia surname is sort of heroic
Click the image to open in full size.
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Old 9th January 2013, 03:43 AM   #17
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The LED will light as ground is more positive than -42 volts.

Gajanan Phadte
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Old 9th January 2013, 11:12 AM   #18
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Once again I remark the thermal derive of the output stage and it is uncontrolled by any current or voltage feedback. The output stage is a time bomb.
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