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Old 26th July 2012, 05:50 PM   #291
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Quote:
Originally Posted by flg View Post
1 key issue here: looking at ZM's Post #281 schemo's (easier to look at and see what's there) the bottom fet will have gain, the top FET will have practically none (1). If the XFRM'R is equal secondaries, the bottom FET rules!
N.P. has said there is some very symetrical action going on here? I don't see it, except for the transfomer, and that is not even true because they both are driving a different load???
flg. Ignore [Z load] for the time being. For simultaneous positive signals to the gates, the upper fet [is a common drain or voltage follower Vg = 1] drives the lower fet [common source Vg >1]. The impedance of the bottom fet must be much higher than [Z load] to be useful. And it is intrinsically high because one is looking into the drain port [like the collector for bjt]. For simultaneous negative signals, the upper fet [now is a common base; no voltage gain; but has a low input impedance at its source] is the load for the same lower fet working in the common source configuration. For the circuit to be useful, the low impedance of the upper fet's [common base] must be much higher than [Z load]. Otherwise current bypassing/shunting happens. The dynamic impedance of the FETs can't be taken in isolation from [Z load]. Or one must take into consideration the magnitude of the dynamic impedances of the Fets relative to [Z load] to make sense of the circuit.
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Old 26th July 2012, 06:10 PM   #292
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oH....

Now I see what the excitement is about. The leads are reversed on the
original posting. Here is the corrected copy.

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Old 26th July 2012, 06:12 PM   #293
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I knew it was a mistake.
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Old 26th July 2012, 06:19 PM   #294
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Would anyone like another helping of red herring?
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Old 26th July 2012, 06:27 PM   #295
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I was just trusting him to have read what I said, several times... I guess, like work, I should shut up now...
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Old 26th July 2012, 06:33 PM   #296
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Quote:
Originally Posted by bobodioulasso View Post
I knew it was a mistake.
More like testing our audio knowledge. Was a fun exam!
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Old 26th July 2012, 06:36 PM   #297
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To survive in the audio biz one must be versed in the art of obfuscation.
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Old 26th July 2012, 06:36 PM   #298
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Quote:
Originally Posted by Zen Mod View Post
that circ is completely traditional - same sex parts driven with opposite phase signals

while Papa's sketch is showing same sex parts driven with identical ( both in amplitude and phase ) signals
Yes, if schema from post #1 would be right. But no after correction - go to post #292.

Last edited by tiefbassuebertr; 26th July 2012 at 06:38 PM.
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Old 26th July 2012, 06:45 PM   #299
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Quote:
Originally Posted by Nelson Pass View Post
oH....

Now I see what the excitement is about. The leads are reversed on the
original posting. Here is the corrected copy.


















Papa , you're Genius ........ with double redish eyes ..........
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File Type: gif smesna.gif (16.0 KB, 605 views)
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Old 26th July 2012, 06:47 PM   #300
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Quote:
Originally Posted by Antoinel View Post
More like testing our audio knowledge. Was a fun exam!
more like mass hysteria ........

this is umpteenth time that Pa pulled my leg up to the sky

call me Naive ZM



- corrected schm after 290 replies
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