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Old 10th August 2012, 05:00 PM   #691
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Agreed. No ideas about scaling output?
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Old 10th August 2012, 05:01 PM   #692
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ZM, your getting at something and i cant figure it out. Not that my stupidity is unexpected.

EDit MV? megavolts?
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Old 10th August 2012, 05:22 PM   #693
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Quote:
Originally Posted by buzzforb View Post
....
EDit MV? megavolts?
why not ?



see ; +/-20V arbitrary - written for then actual chat

later I saw interesting idea too - called Hawksford buffer (second pic )

plain one is cascode voltage biass referenced to gnd , H. same referenced to sources - having as result that jfets are working in real constant voltage mode

search to read what's difference - lower output impedance , if I remember that well

didn't measured , didn't tried
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File Type: jpg Hawksford buffer.jpg (73.9 KB, 829 views)
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Old 10th August 2012, 05:34 PM   #694
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found it ...... partially - JG : Buffer Preamp with Shunt PS
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Old 10th August 2012, 07:07 PM   #695
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Yes, i designed it. It is a driven cascode but "the other way around". Hawksford´s original
circuit had a driven cascode in the second stage. There is a paper on his website about it.
Later i heard that Borbely did the same 7 years before and that it was known to designers of Oszilloscopes.
People that build it responded that the bass was sounding better compared to the ground referenced version. It should improve distortion into low impedances.
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Old 10th August 2012, 07:11 PM   #696
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Here we go :http://www.essex.ac.uk/csee/research...%20cascode.pdf

It has to do with returning or using the base current in BJT circuits that is normally lost.
I think our Dimitry made an AES paper with more details and optimization.
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Old 10th August 2012, 07:19 PM   #697
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Wow, Amazing info and talent here. Never ceased to be amazed. JG, did you ever do a listening test? THanks again ZM, you never fail....to surprise me.
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Old 10th August 2012, 07:21 PM   #698
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Yes, i use that buffer too but when i say i like it then i have to prove it. By measurements ? Sure, that is one way.
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Old 10th August 2012, 07:26 PM   #699
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At the very least it is worth a try. MY brother and I eagerly await the arrival of the MPP. He is a bit of a vinyl fanatic and me being into DIY audio has given me the opportunity to upset hiw little world some It will be competting against a Conrad Johnson.
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Old 10th August 2012, 07:29 PM   #700
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Quote:
Originally Posted by Joachim Gerhard View Post
but "the other way around".
Very smart.
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