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Old 19th March 2013, 06:25 PM   #8681
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Originally Posted by jacco vermeulen View Post
thanks for the clarification.
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Old 20th March 2013, 03:25 AM   #8682
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Just FYI I tried the transconductance stage on the paradise style and it seems to be a bit noisy.
Slimyulation seems to confirm that.
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Old 20th March 2013, 03:34 AM   #8683
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That is strange, my build is qiet.
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Old 20th March 2013, 04:47 AM   #8684
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This is interesting :
http://www.en-genius.net/includes/files/tmt_1002.pdf
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Old 20th March 2013, 05:26 AM   #8685
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After much head scratching and work done by Frans and me i decided for the balanced Paradise to go back to circuit 8440. The problem with the transimpedance solution is that i can not guaranty that a current flows into the cartridge. That is much easier to solve with the transconductance circuit 8440 and it does not need as much change to the original schematic. I also listened more and the transimpedance input, at last how i build it, makes the sound a little harsh. The improvements we made to the circuit also added complexity and did not give ideal noise performance ones we solved the peaking. To trim the offset again brings in more components. I do not say that it is not solvable but 8440 is the easy road and it sounds pretty decent.
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Old 20th March 2013, 06:57 AM   #8686
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One of the view investigations what happens when you connect a speaker to an amp :
http://www.linearaudio.nl/linearaudi...0interface.pdf
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Old 20th March 2013, 07:18 AM   #8687
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Quote:
Originally Posted by Joachim Gerhard View Post
Good morning to you
Yes it realy is tanks
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Old 20th March 2013, 07:24 AM   #8688
MiiB is offline MiiB  Denmark
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I think the wort is that we tend to look at the voltage-performance and forget about the current, making the assumption that when voltage performance is good, then then current performance will follow. Fact is that the two are quite independent.. we tend to believe that low output impedance is the same as low current distortion.. I wonder how to get a good grasp and understanding on this...
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Old 20th March 2013, 08:06 AM   #8689
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I can measure distortion in the current with my Klippel. I know.
For example ALNICO magnets did much better then ferrite in that regard.
I can post the measurements, i have them somewhere.
It was also better then Neodym although you may not like that Michael.
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Old 20th March 2013, 08:17 AM   #8690
MiiB is offline MiiB  Denmark
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I know, but to isolate the performance only to the magnet material is not terribly solid. There are more issues to dynamic magnetic flux variations when it comes to lsp motor designs. On top of that lays the dynamic acoustic foot print and compression left from the size of the magnet structure.

Most dynamic flux variations can be tamed by hysteresis rings, or by some crazy mean of a counter driven magnet structure. (ooops)
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