SuSy Circlotron - jFET input Buffer + OPA1632 + 2SK135 - diyAudio
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Old 8th February 2010, 01:44 PM   #1
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Default SuSy Circlotron - jFET input Buffer + OPA1632 + 2SK135

by the mirror website
DIYAudio.rs
I found this topology
Lateral MOSFETs SuSy circlotron - DIYAudio.rs

By the datasheet of the OPA1632 I missed the internal circuit diagram.
This could be helpful for better understanding and implementations of new ideas in the whole circuit.

Who knows more about the internal topology?

P.S. Google translation isn't good. ZM, please review the translation for us a little
http://translate.google.de/translate...-circlotron%2F

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Old 8th February 2010, 02:41 PM   #2
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http://www.grimmaudio.com/whitepaper...g%20blocks.pdf
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Old 8th February 2010, 03:09 PM   #3
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Juma is funny guy who made this amp ; I believe that he'll chip in and reply whatever you have to ask
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Old 8th February 2010, 03:30 PM   #4
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very interesting website - thank you
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Old 8th February 2010, 05:45 PM   #5
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Quote:
Originally Posted by tiefbassuebertr View Post
...By the datasheet of the OPA1632 I missed the internal circuit diagram....
Here it is:
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Old 8th February 2010, 06:28 PM   #6
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Next from Cyberdyne Systems : the fully differential BF862 discrete opamp.
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Old 8th February 2010, 08:15 PM   #7
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Quote:
Originally Posted by juma View Post
Here it is:
thank you very much.
Where you have this discovered?
A certain similarity to the AD797 should not be overlooked (see attachement). The difference is mainly the balanced buffer driving and the absence of current mirror. Current mirror was often used for unbalanced output. But I hate current mirrors. Check out therefore this:
AD797 discrete clone - comparison of seven variations

Now I try to create some discrete versions for such a circlotron with voltage gain
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File Type: pdf OPA1632 vs AD797.pdf (100.6 KB, 323 views)

Last edited by tiefbassuebertr; 8th February 2010 at 08:19 PM.
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Old 8th February 2010, 08:28 PM   #8
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TI had the good taste to license the patent.

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Old 8th February 2010, 08:29 PM   #9
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Quote:
Originally Posted by jacco vermeulen View Post
Next from Cyberdyne Systems : the fully differential BF862 discrete opamp.
Done, but opa1632/ths4131 still sounds better
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Old 8th February 2010, 10:34 PM   #10
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Quote:
Originally Posted by tiefbassuebertr View Post
Where you have this discovered?
=> SLOA054, almost identical to the schematic at page 2 in Bruno Putzeys' article i linked to.
Also read SLOA072 and SLOA99 from TI
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