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Old 6th October 2008, 12:58 PM   #21
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Quote:
Originally posted by mzperx
This circuits has very poor CMRR at low frequency. And C1/C5 pairs have to be well matched in order to avoid further CMRR degradation and to keep theoretical 40dB CMRR.
//That's why I choose OPA1632 into 2nd position.

I have a name for your RIAA preamp -- the Hunga-RIAA-ton -- after the eponymous record label.

In 1981 there were a series of articles in TAA which described a mod for the Marantz 7 -- they called the RIAA section the DRIAAgon.

I can't find Scott's post...search under members.
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Old 6th October 2008, 02:14 PM   #22
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Quote:
Originally posted by EUVL
> Differential DIY OPAMP -- Scott Wurcer posted under "Measuring Low Noise"

Can you kindly post a link please.


Thanks,
Patrick

http://www.diyaudio.com/forums/attac...amp=1220707608
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Old 10th October 2008, 07:18 PM   #23
Stee is offline Stee  Italy
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Default sorry don't have schematic

http://nadelectronics.com/products/h...plifier/images
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Old 10th October 2008, 09:29 PM   #24
mlloyd1 is offline mlloyd1  United States
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Default Re: sorry don't have schematic

courtesy of algar emi:

http://www.diyaudio.com/forums/showt...445#post712445

mlloyd1

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Old 11th October 2008, 08:58 AM   #25
Stee is offline Stee  Italy
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Default Just A Picture

NAD PP2 VER.5 IS MADE WITH

A970 C2240 -->A PAIR FOR EACH CHANNEL (there is MM/MC in)
PLUS ONE OPA NE5532P

SEE PICTURE ON MY SITE
http://www.esafono.it/NAD_PP2_VER5B.jpg

if someone is able to make schematic from PCB picture ...
i can do that

for this project you need double preamp (four channel HOT/COLD)
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Old 11th October 2008, 10:59 AM   #26
Stee is offline Stee  Italy
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Default BALANCED POWER RIAA

the same OPA of PP2 can drive
a double copule of 2SA1930-2SC5171
(again 4 channel) to have a complete amplifier...
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