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Old 26th March 2013, 08:21 PM   #521
FdW is offline FdW  Netherlands
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gotcha! Let me try to see how it simulates and I will get back to you.
Hey... do you doubt my simulator?
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Old 26th March 2013, 08:31 PM   #522
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Hey... do you doubt my simulator?
One smiles, he saw the light. Then there is one trying to smash the light, but he will be punished.
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Old 26th March 2013, 08:31 PM   #523
Stefanoo is offline Stefanoo  Italy
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thanks you all guys for your contribution so far.
I am uploading the latest schematic.
ONLY one RIAA required. Pretty cool.

Frans, I will have to try your Servo Solution on the circuit.
I tried it yesterday but it wasn't working.
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Old 26th March 2013, 08:32 PM   #524
Stefanoo is offline Stefanoo  Italy
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One smiles, he saw the light. Then there is one trying to smash the light, but he will be punished.
ahahahah!!!! NOOOOOO!!!
I didn't think you had tried that!
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Old 26th March 2013, 08:33 PM   #525
Stefanoo is offline Stefanoo  Italy
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Do we want to consider Kelvin's buffer like Joachim was recommending?
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Old 26th March 2013, 08:44 PM   #526
mkc is offline mkc  Denmark
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I also wondered why you didn't remove one of the RIAA networks. I would convert R17 into 2 resistors i series and ground the middle connection of these 2 resistors to gnd.
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Old 26th March 2013, 08:52 PM   #527
Stefanoo is offline Stefanoo  Italy
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I also wondered why you didn't remove one of the RIAA networks. I would convert R17 into 2 resistors i series and ground the middle connection of these 2 resistors to gnd.
I just did.
do you want to ground the series of resistor at the center?
What advantage would you think you would get by doing that?
To me leaving it floating is more immune to noise just an idea.
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Old 26th March 2013, 09:08 PM   #528
Stefanoo is offline Stefanoo  Italy
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I am attaching the model. It looks like I can't get a solid result.
Could anybody here look at it and make sure I am not making any gross mistake?
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Old 26th March 2013, 09:20 PM   #529
FdW is offline FdW  Netherlands
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I am attaching the model. It looks like I can't get a solid result.
Could anybody here look at it and make sure I am not making any gross mistake?
Remove the faulty servo
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Old 26th March 2013, 09:23 PM   #530
Stefanoo is offline Stefanoo  Italy
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I actually find that the two halves when RIAA is shared between legs are different.
However if 68K is split in two and center GND, this problem improves, but I still see no real symmetry for some reason.

Any thought?
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