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Old 17th April 2013, 01:58 PM   #2091
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Here is an example based on the INA163 :
Calvin-phono/PlatINA en - calvins-audio-pages
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Old 17th April 2013, 02:04 PM   #2092
RCruz is offline RCruz  Switzerland
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Thank you JG

Is INA163 a fet imput device ?
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Old 17th April 2013, 02:30 PM   #2093
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I do not think so, it is BJT.
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Old 17th April 2013, 03:26 PM   #2094
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Hi Riccardo I have posted a while ago my LT1028 balanced
Maybe Joachim remembers?
Using complete INA limit resistor value choice? 3 K and 6 K for 163 while discrete 3 LT1028 alowd for much lower values.
Worth looking at FDW balanced ?(yes I know I need to get back to it SORRY is not forgotten)
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Old 17th April 2013, 03:44 PM   #2095
RCruz is offline RCruz  Switzerland
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Good post.... you read my mind... there might be limitations due to INA input imp

Is LT1028 jfet input opamp ?

Can you find your post about the balanced input ?
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Old 17th April 2013, 04:06 PM   #2096
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Ricardo,

noise figures in the order of 1nV/√Hz or lower are achievable only with bipolar input.
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Old 17th April 2013, 04:09 PM   #2097
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Quote:
Originally Posted by Bksabath View Post
Worth looking at FDW balanced ?(yes I know I need to get back to it SORRY is not forgotten)
Why the question mark, and where are the listening reports?
Balanced input all DC coupled RIAA preamp
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Old 17th April 2013, 04:25 PM   #2098
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Long time ago here a couple of preliminary drawing (I am sure you can do better than me)

One is Split passive and did run for couple of years try ed AD797 but was a bit to metallic
second was going to be, till I got infected by MPP and decided to try and learn sumthink about transistors, tanks so much, to late now to realize that Public forum is not right place.

LT1028 is BJT low noise voltage wise Current wise noise is sort of forget to mention it so data sheet looks better .

But said before Frans got better...

Cant promise much all old file are in secret puter never connected to intra web at present in the loft untouched for quite a while
Attached Images
File Type: jpg RIAA old SCH 001.jpg (963.1 KB, 209 views)
Attached Files
File Type: doc Riccardo RIIA1.doc (33.0 KB, 19 views)
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Old 17th April 2013, 06:14 PM   #2099
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Why the same opamp for the differential gain stage ?
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Old 17th April 2013, 06:17 PM   #2100
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Thank you. Two servos and riaa filter around feedback loop.... not my piece of cake but invaluable info nontheless regarding balanced topology
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