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Old 7th May 2008, 06:59 AM   #31
PMA is offline PMA  Europe
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Quote:
Originally posted by jcx
[B] so at least a buffer in the loop seems desirable
Yes it is, always.
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Old 7th May 2008, 08:47 AM   #32
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This is my take on a Riaa concept. Riaa circuit in Feedback loop
Gain app 45 dB at 1 KHz, so for mc's an additional circuit is needed; a pre pre maybe or the LC-Audio light powered circuit??
Fite Riaa curve beautifully within 0.5 dB with most deviation as an extra lift in the base.
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Old 7th May 2008, 09:02 AM   #33
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Sorry forgot PDF
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File Type: pdf riaa-concept.pdf (21.8 KB, 478 views)
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Old 7th May 2008, 10:58 AM   #34
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Default Sorry

original poster started a "discussion"
eventually, schematics may develop.
be patient ....
or propose something yourself.

Sorry for all who read my coment to sharp, I read many pavel comment in other thread also seeing so works he has done I hope to see some thing more than just a short coment. I dont believe he is a NATO guy, isn't he ?
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Old 7th May 2008, 04:35 PM   #35
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Default My own RIAA amp with passive RIAA network

I plan (some time in the future) to design a RIAA amp with passive RIAA network. Specifications so far can be read at my homepage, see link below.

NE5534, LT1028, LT1115, LME49710, AD745, AD797 will be opamps in mind, both DIL08 and SO08
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Old 7th May 2008, 04:48 PM   #36
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Walt Jung did a great paper on the tradeoffs between passive and active equalization. I can't get to it - maybe someone can post up a link. IIRC, it included some commentary on split architecture equalisation as well.

Seems to me this is another subject where we are going to have to agree to disagree - especially if you throw in the zero feedback or with feedback option as well.
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Old 7th May 2008, 05:31 PM   #37
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He has written quite much in the book Op Amp Applications Handbook
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Old 7th May 2008, 05:32 PM   #38
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Quote:
Originally posted by Bonsai
Walt Jung did a great paper on the tradeoffs between passive and active equalization. I can't get to it - maybe someone can post up a link. IIRC, it included some commentary on split architecture equalisation as well.
The link to Walt's RIAA articles is here
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Old 7th May 2008, 05:34 PM   #39
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Quite much from these articles is in the book also but perhaps more edited.
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Old 9th May 2008, 06:02 AM   #40
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Thanks Andy.

Starting point now might be to develop two theoretical circuits and explore the performance and compare them.

I like JCX's CFA suggestion for the active approach - however, would the noise performance be equal to that of a really good low noise VFA - say like the LT1115 or the new NS op-amps?

I'm still pondering which is better - th e IC op-amp route or a discrete approach.

Talking about the topology, I do have a predilection for the active a approach due to headroom requirements on the passive approach and possibly higher overall noise.
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