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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 19th March 2010, 09:14 AM   #3381
Joao@AltheaMusica is offline Joao@AltheaMusica  Switzerland
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@ Merlin:
Wich others? > all the professional designers out there are using it.

@ Caro Ricardo
How do you think Jim builds and tests his iRIAA ?
The best way to test a iRIAA is certanly the use of a propperly setup RIAA no ?

I don't know how Jim Hagerman is doing it. There is an exactly measuring rule to do check this:
Build a low impedance Inverse RIAA - 600 Ohms for example - and insert it between the signal generator and the phono stage input. Measure the amplitude frequency response. If your curve RIAA network is correct you must get a proper frequence response.

That's the theory. Sonical the result can be "adjusted" like you all know... I agree that not all discs are cutted with that 50khz drop off but that's live.
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Old 19th March 2010, 11:33 AM   #3382
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
Would you share the reasoning behind the resistor value.... why 200r ?
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Old 19th March 2010, 12:05 PM   #3383
Salas is online now Salas  Greece
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Simplistic NJFET RIAA
Creates a compatible zero rectifying the droop when driven with the extra pole. Just EQ.
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Old 19th March 2010, 12:23 PM   #3384
merlin el mago is offline merlin el mago
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Thumbs up Riaa

Hey guys, interesting exchange of ideas about RIAA
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Old 19th March 2010, 12:47 PM   #3385
massimo is offline massimo  Italy
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No Inter vs. Barca in Madrid.... we'll stop in Barcellona.
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Old 19th March 2010, 01:00 PM   #3386
merlin el mago is offline merlin el mago
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Now 2 Tx + 2 PSU in one box & Phono RIAA using 2 Regs in other box.

Subjetive impressions: more gain, more separation between channels, etc., are far better than using 1 reg & 1 Tx.

Next step "remote sensing".
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Old 19th March 2010, 01:03 PM   #3387
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by massimo View Post
No Inter vs. Barca in Madrid.... we'll stop in Barcellona.
Who knows, in Madrid no, but is possible Inter plays & wins the Champions League, why not?
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Old 19th March 2010, 03:17 PM   #3388
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
Quote:
Originally Posted by merlin el mago View Post
Now 2 Tx + 2 PSU in one box & Phono RIAA using 2 Regs in other box.

Subjetive impressions: more gain, more separation between channels, etc., are far better than using 1 reg & 1 Tx.

Next step "remote sensing".
Now you´r talking
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Old 19th March 2010, 03:26 PM   #3389
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
Quote:
Originally Posted by Joao@AltheaMusica View Post
@ Merlin:
> all the professional designers out there are using it.

@ Caro Ricardo

I don't know how Jim Hagerman is doing it. There is an exactly measuring rule to do check this:
Build a low impedance Inverse RIAA - 600 Ohms for example - and insert it between the signal generator and the phono stage input. Measure the amplitude frequency response. If your curve RIAA network is correct you must get a proper frequence response.

That's the theory. Sonical the result can be "adjusted" like you all know... I agree that not all discs are cutted with that 50khz drop off but that's live.
Would you give me a hint about one or two OEM phono preamps that actually use a 4rth pole in the 50kHz ? Today I am atending another Audio Fair and would like to know.

Do you mean that building a low impedance iRIAA is more acurate than building the RIAA itself ?

I am strugling to reach the optimum curve but it seems there are many ways to reach Rome.....
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Old 19th March 2010, 03:27 PM   #3390
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
Quote:
Originally Posted by Salas View Post
Creates a compatible zero rectifying the droop when driven with the extra pole. Just EQ.
I believe I got the math behind it already.... I will ask your opinion latter.
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