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Old 10th September 2001, 04:15 AM   #11
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Join Date: Feb 2001
Location: Columbia, SC
Chris,
Metaxas Audio has the schematic for a passive RIAA phono stage on their website. There's no reason you couldn't substitute the Burr Brown chips for the gain stages they're using. Or, you could go discrete. They've got schematics for a regulated power supply to go with it, too.
http://www.metaxas.com/pages/technology/diy.html

Grey
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Old 10th September 2001, 01:34 PM   #12
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Join Date: Dec 2000
Location: Önnarp, Söderslätt
to Chris.

paulb has a point about scanning the article.
I guess I was responding to your post, before I was thinking. Sorry.
You could try and ask AudioXpress or Electronics World for a copy, or go directly to mr. Thagard himself.
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Hoffmeyer ;0)
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Old 10th September 2001, 04:19 PM   #13
Freddie is offline Freddie  Sweden
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Perhaps you can find what you are looking for here?
http://www.epanorama.net/audiocircuits.html

/Freddie
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Old 11th September 2001, 09:24 AM   #14
Chris is offline Chris  Norway
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Thanks to everybody for giving me and others usefull information and new ideas !!! I agree with Paul B. and Hoffmeyer that sending around newly published material is bad net etiquette and will give this forum some bad karma.

I`m still not shure what I`m going to designvise.
Opamps or discrete ?
Having read Mr Nelson Pass diy opamps makes me wonder if two discrete opamps (jefet or mosfet) with a passive riaafilter between them is the way to go ?

Have any of you DIY`ers tried this in similar disigns? (Headphone amps, analouge stages in dac`s etc.)

Chris
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Old 11th September 2001, 02:12 PM   #15
paulb is offline paulb  Canada
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One thing I remember about Thagard's design is that it was based on a discrete op-amp implementation of the design in a National app note:
http://www.national.com/an/AN/AN-346.pdf
I think Thagard said that it was very difficult to get performance from discretes as good as that available from ICs.
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Old 12th September 2001, 02:31 PM   #16
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Join Date: Sep 2001
Location: Fairbanks, Alaska
Default RIAA Phono Preamps

For anyone who may be looking to build some very good low noise moving coil phono pre-amps. Take a look at the one I layed out a number of years back on my web site:

The Link is:

http://www.audioamps.com/diyparts/pcb/pcb.htm

Pictures for the Printed circuit boards are shown and blank circuit boards are available. Each channel is on its own board. Also posted on the site are handy graphs for the RIAA curves. Prehaps these can help fill a requirement that you may have.

Best Regards,

John Fassotte
Alaskan Audio

Changed the link on 10/27/2001

[Edited by alaskanaudio on 10-27-2001 at 12:43 PM]
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