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Old 13th December 2012, 10:22 PM   #11
DF96 is offline DF96  England
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My thought was that if someone had CDs with continuous compressed pop with dynamic range of about 1dB then the bias circuit would not be able to do anything until the CD finished (74 mins max?). Real music of course has much more variation so plenty of opportunity to adjust bias.
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Old 13th December 2012, 11:06 PM   #12
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Quote:
Originally Posted by DF96 View Post
My thought was that if someone had CDs with continuous compressed pop with dynamic range of about 1dB then the bias circuit would not be able to do anything until the CD finished (74 mins max?). Real music of course has much more variation so plenty of opportunity to adjust bias.
I don't think for such music precise bias matters. Class B will be fine, no sounds decay.
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Old 14th December 2012, 11:22 AM   #13
DF96 is offline DF96  England
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For some music Class C might be sufficient!
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Old 14th December 2012, 11:36 AM   #14
palmas is offline palmas  Portugal
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Quote:
Originally Posted by DF96 View Post
For some music Class C might be sufficient!
I know I'll be using it to have enough voltage from my function generator to drive tubes for testing...
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Old 14th December 2012, 11:43 AM   #15
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I got that same email !!!

I think of lots of great stuff for that opamp since National Semiconductors version has been no longer available for many many years !!!!

Cheers !!

jer
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Old 9th July 2014, 04:37 AM   #16
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I got a New Email Today!!!

I see LT is now making a dual version of the LTC6090 it is called the LTC6091!!!!

http://cds.linear.com/docs/en/datasheet/6091f.pdf

http://www.linear.com/solutions/4695...ign=LT_Insider

jer

Last edited by geraldfryjr; 9th July 2014 at 04:48 AM.
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Old 9th July 2014, 04:42 AM   #17
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Typically bias servos for Class AB clamp the current monitor signal at 2 x the idle current before averaging.
Menno/Guido do this a bit differently. They use more gain and a much narrower clamp window about the desired operating point.
Like this:

and Rob did his own variation here:
http://rmsacoustics.nl/rmsacoustics/...-circuits.html

Cheers,
Ian
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Last edited by gingertube; 9th July 2014 at 04:52 AM. Reason: Rob link added
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