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Old 19th July 2012, 12:39 AM   #1021
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Here we go.....
It works extremely well, i tried a BJT version in a phono stage.
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Old 19th July 2012, 12:44 AM   #1022
bcarso is offline bcarso  United States
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Quote:
Originally Posted by Joachim Gerhard View Post
Here we go.....
It works extremely well, i tried a BJT version in a phono stage.
Maybe move the diode-connected transistors to be the loads of the JFET drains instead of the output devices?

Brad
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Old 19th July 2012, 12:46 AM   #1023
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Sure, this came right out of my head.
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Old 19th July 2012, 12:46 AM   #1024
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The mirror can be improved much of cause.
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Old 19th July 2012, 01:01 AM   #1025
bcarso is offline bcarso  United States
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Quote:
Originally Posted by Joachim Gerhard View Post
Sure, this came right out of my head.
I knew that It's one of those cases where we know so well what is intended that we can't "see" what we've drawn.
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Old 19th July 2012, 01:09 AM   #1026
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And when we do not bring it to paper, immediately with all mistakes, we forget it.
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Old 19th July 2012, 03:40 AM   #1027
EUVL is offline EUVL  Europe
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The other option is to use one half of a blowtorch.
But I don't really like adding another stage.

When Joachim finalises his design, we'll make a proto.
Just like your buffer filter. How does that sound ?




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Old 19th July 2012, 03:43 AM   #1028
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Paul,

Please try one phase of SEN in yours and report back.

In our AD1865 setup, it is dead quiet on one phase, with 1k R_iv.
If it is noisy in yours, then it is either the 9018 itself, or 9018 board layout.


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Old 19th July 2012, 04:37 AM   #1029
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Patrick,

Io current output of AD1865 is single-ended.

WK
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Old 19th July 2012, 04:40 AM   #1030
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Of course. Stupid me.

Still, no reason that one phase of 9018 should be noise.
But we better measure the chip ourselves before making more comments.


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