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Old 25th February 2013, 02:12 AM   #1921
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Here are my measurements against Wayne's.
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Old 25th February 2013, 02:20 AM   #1922
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Jfet idss are too high, robbing folded cascode net of available current? Just guessing though.
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Old 25th February 2013, 02:24 AM   #1923
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Which Jfets? The paralleled inputs or the Differential pair?
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Old 25th February 2013, 02:27 AM   #1924
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As note, the working channel measurements are very similar except I can adjust to 0 at the output.
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Old 25th February 2013, 02:27 AM   #1925
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Input Jfets, but I am sorta guessing and very new to folded designs. ZM will be along.
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Old 25th February 2013, 02:28 AM   #1926
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Quote:
Originally Posted by bnorrish View Post
As note, the working channel measurements are very similar except I can adjust to 0 at the output.
Im out then
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Old 25th February 2013, 02:29 AM   #1927
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I am guessing Q5 is bad.
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Old 25th February 2013, 02:49 AM   #1928
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I am interested to see this answer. You have 1.5V across R6?
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Old 25th February 2013, 02:53 AM   #1929
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Close. 1.6-1.7 if remember correctly.
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Old 25th February 2013, 02:57 AM   #1930
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I have guess, but nothing more. As I said, i want to see the answer ont his one. It will be learning experience for me as well. sorry I couldnt help.
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