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Old 3rd February 2006, 10:39 PM   #11
burbeck is offline burbeck  United Kingdom
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hi try this http://waltjung.org/PDFs/A_High_Accu...AA_Network.pdf
regards

bob
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Old 4th February 2006, 01:46 AM   #12
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Thanks, I remembered that article but didn't kow where to find it.
Fortunately a 50KHz zero is not going to have much group delay error below 20KHz. The modified RIAA IEC warp filter pole is another story.
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Old 4th February 2006, 09:43 AM   #13
AndrewT is offline AndrewT  Scotland
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The newer warp filter is not used at the recording stage, it is only recommended for playback.
In my view the IEC version and some with slightly extended bass response ruin a major attribute of vinyl playback. Avoid it if possible and mimic the old style curve.

Your inverse RIAA should be based on the recording curve and since you plan to use it for tesing other RIAA stages I suggest you aim for an accuracy about 10 times better than the prototype circuits. At least then you will know with a reasonable certainty that errors are in the prototype and not in the reference.
This will require resistors to about 0.1% and caps about 0.5% (absolute not just matching accuracy) or better if you can achieve it (I don't know how), but I'm all ears.

Do your best to keep it very accurate. You are only building it once and only one channel.
By the way you can achieve tiny corrections by paralleling resistors many decades apart. The bigger one then does not need to be precision, 1% will do.
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Old 4th February 2006, 10:38 AM   #14
Zoran is offline Zoran  Serbia
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Hi
For the simulation I used
the Haggerman inverse riaa
maybe it will help...
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Old 4th February 2006, 07:45 PM   #15
Zoran is offline Zoran  Serbia
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there is the original PDF
by Jim Hagrerman...
and ZIP file contains
some upgrades from audiophile called "Ouch"
interesting...
Attached Files
File Type: pdf riaa_hagerman.pdf (46.5 KB, 144 views)
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Old 4th February 2006, 07:53 PM   #16
Zoran is offline Zoran  Serbia
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Join Date: Jan 2004
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I am using modified inverse RIAA net
for the simulations...
note:
only two RIAA networks are show normal results
1. Morgan Jones all in one network
2. LC network by western electric
the zip file is too long...
here is web address if it is still on line...
http://www.siteswithstyle.com/VoltSecond/index.html
cheers
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Old 5th February 2006, 04:59 AM   #17
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Zoran,

Thanks for pointing out the original. I was wondering why the EC8010 circuit looked so familiar.

jh
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