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Old 24th April 2013, 07:36 AM   #11
Stee is offline Stee  Italy
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Default What do you understand

is not the message of the project : Shhh:
the theme is set to gain ratio : Joker:

then comes the architecture
then comes the sizing
and the choice of components

the rest are all sterile chat: (
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Old 24th April 2013, 09:04 AM   #12
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once the, 'you can't do that' people calm down,

something interesting might appear in this thread .



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Quote:
Originally Posted by GoatGuy View Post


Optics.

Maybe some of us remember back to the nicer cameras of the 1950s ...

have a friend, who still takes his Speed Graphic with him everywhere ...
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Old 24th April 2013, 11:37 AM   #13
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Quote:
Originally Posted by Stee View Post
.....the theme is set to gain ratio : Joker:.....
Ok, let's be specific: Why do you consider the ratio between open and closed loop gain significant?
Do you believe the ratio is constant in an amplifier over the audio bandwidth so this can be a
meaningful design goal or are you assuming that setting it a particular frequency is adequate?
There is nothing so far to support your assertion.
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Old 24th April 2013, 12:21 PM   #14
Stee is offline Stee  Italy
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http://www.esafono.it/1TO100RULE.pdf
is an aesthetic relationship of the acoustic scene
acts as a rebuilder of space as expander
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Old 24th April 2013, 01:03 PM   #15
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Nothing new here, surely?

The document just described a low NFB amp with output transformer to lower output impedance.

I suspect it measures badly but sounds, what's that word I see around here, errr.. euphonic!

There is no Golden Rule for open loop to closed loop or loop gain ratio. These ratios will vary from design to design and from topology to topology and with performance goals; and as already stated, within a given design these parameters are not one dimensional, they vary with frequency, temperature and possibly more.
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Old 24th April 2013, 01:10 PM   #16
DF96 is offline DF96  England
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Complete nonsense! It advocates using just enough feedback to ensure the presence of re-entrant distortion, but not enough to reduce all distortions. Barmy ideas expressed in poor English.
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Old 24th April 2013, 02:04 PM   #17
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Quote:
Originally Posted by Stee View Post
http://www.esafono.it/1TO100RULE.pdf
is an aesthetic relationship of the acoustic scene
acts as a rebuilder of space as expander
OK, no technical reason - just Stee's aesthetic number rules.

These thematic designs you post and illustrate on your website are certainly imaginative and must make wonderful copy
for impressionable people to read but if the ideas crumble at the first level of inquiry, surely you must have doubts about
their value compared to established audio design theory. I don't mean to say categorically that you are wrong, if that
actually matters to you, but the onus is heavily on you to prove your claims by demonstrating that they can at least work
correctly as power amplifiers.

Otherwise, demonstrate their benefit by simulation or other evidence first. There are nebulous combinations of components
that can amplify audio but few ideas are worth building or even serious consideration. Let's see some that really can work
and deliver on the promise of the glowing descriptions and titles you give them.

I'm actually for a little imaginative thinking, perhaps as tomtt suggests, because this enables us to move on to new areas
and possibilities but you can't get there without a proven basis to build ideas on. That won't come out of the ether or from the
elaborations and chip-level techniques of opamps without a grounding in what is actually needed. Meantime, start simpler
and build from there - with purpose.
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Last edited by Ian Finch; 24th April 2013 at 02:08 PM.
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Old 24th April 2013, 02:10 PM   #18
GoatGuy is offline GoatGuy  United States
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There is nothing here. Stee's "designs" are unattributed work of others, and I believe "entirely" also applies. They're cut'n'paste frankensteins.
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Old 24th April 2013, 06:13 PM   #19
JMFahey is offline JMFahey  Argentina
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FWIW I found Stee's posts and links at an Australian Audio site.
*We* are showing lots of open mindness; there they weren't commented, not even to rebuke them.
The deafening silence of the open desert.
Looks like the Aussies are more practical minded than us, and don't have much time for idle pointless "discussions" ... or so it seems.
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Old 24th April 2013, 07:13 PM   #20
GoatGuy is offline GoatGuy  United States
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JMFahey ... for a certain amount of comedy, check out the design of post #11 ... after scratching my head endlessly, I think the entire "front end" is a do-nothing amplifier. Basically a fancy source-follower. The driven transistors on the righthand section certainly don't look power hungry. So... that and missing resistor values everywhere ... leads me to believe this is just "design salad".

Further apart from the enthusiastic 24/40 label of golden ratios, there appears to be nothing in the circuit that could achieve such precision.

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