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Old 1st June 2004, 09:27 AM   #11
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I like that circuit.
But is the gain 30 with a speaker load?
Seems to me the input stage has very little gain. Unloaded the output has lots of gain since they are curent source loaded, but with an 4-8ohm load that gain drops a bit???
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Old 1st June 2004, 09:41 AM   #12
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The more I think...ouch, I think this amp is a bit load dependant, gain rising when load impedance rising. Thats kinda like amps with zero loop NFB, and I'm one of those who believe that's actually a GOOD thing. I'm not even going to try and argue about this, but all amps I've heard it's the amps with this kind of load dependancy that sound best. Oh, oh, dont start this...
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Old 1st June 2004, 12:40 PM   #13
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Quote:
Maybe you will win a Nobel Prize ,because you have discouvered something new in electronics:
Ah, interesting! Who can spot the erroneous premise in TubeDude's supposition?
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Old 1st June 2004, 12:46 PM   #14
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Quote:
Originally posted by traderbam

Ah, interesting! Who can spot the erroneous premise in TubeDude's supposition?

__________________
Jorge
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Old 1st June 2004, 01:54 PM   #15
PMA is offline PMA  Europe
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Most usually the output of CD is 6.6Vp-p.
p-p means peak to peak, so it is 2 x Vrms x sqrt(2).
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Old 1st June 2004, 03:01 PM   #16
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I dunno. The gain should be about 5. Still thinking.
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Old 1st June 2004, 04:17 PM   #17
argo is offline argo  Estonia
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Maybe the Nobel Prize should go to this guy here:
http://www.ne.jp/asahi/evo/amp/J200K1529/report.htm

Click the image to open in full size.
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Old 1st June 2004, 04:35 PM   #18
azira is offline azira  United States
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Quote:
Originally posted by traderbam

Ah, interesting! Who can spot the erroneous premise in TubeDude's supposition?
I'll bite...

I can't imagine any scenario in which this amp doesn't look like a standard negative feedback amplifier. So it's gain can't possibly be above 1/B (~= 4) because that's the limit as Ao gets astronomically large..

Please enlighten us..
--
Danny
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Old 1st June 2004, 04:40 PM   #19
Bricolo is offline Bricolo  France
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Maybe the complementary differential / complementary output thingie doubles the gain

but I'm really not sure
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Old 1st June 2004, 05:09 PM   #20
PMA is offline PMA  Europe
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No. They are feedback resistors that estimate the gain. No other way is possible. The gain is less or equal to the 1 + resistor's ratio (non-inverting amp).
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