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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 11th January 2015, 05:50 PM   #13971
orelli is offline orelli  Italy
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Quote:
Originally Posted by Salas View Post
Better vary R20 instead. Keep the cap.
where is R20?
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Old 11th January 2015, 05:53 PM   #13972
orelli is offline orelli  Italy
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Merlino, are you running single ended or balanced?
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Old 11th January 2015, 05:55 PM   #13973
Salas is offline Salas  Greece
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Originally Posted by orelli View Post
where is R20?
In his particular simulation. Meaning his source resistor for depletion Mosfet. Can vary that CCS current.
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Old 11th January 2015, 05:55 PM   #13974
RCruz is offline RCruz  Switzerland
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Originally Posted by orelli View Post
where is R20?
R20 is the source resistor in the new CCS (in my simulation it is numbered R20)
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Old 11th January 2015, 05:57 PM   #13975
Salas is offline Salas  Greece
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Originally Posted by merlin el mago View Post
Really really a piece of cake and a pleasure making the FSP, plenty of power, a lot of detail, a new beast is born to let us enjoy our vinyl treasures.
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Old 11th January 2015, 05:59 PM   #13976
Salas is offline Salas  Greece
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Quote:
Originally Posted by RCruz View Post
R20 is the source resistor in the new CCS (in my simulation it is numbered R20)
Run FFT with input signal good for -10dB output which is the normal for this. I will tell you if it ties with reality bcs I had run real FFT in many builds.
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Old 11th January 2015, 06:00 PM   #13977
RCruz is offline RCruz  Switzerland
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Originally Posted by Salas View Post
It will reject better the rail but it will inject some extra current noise too. Listen carefully for tradeoffs.
Will try a noise analisys before implementation.

Can we get lower noise with bjt CCS ?
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Old 11th January 2015, 06:02 PM   #13978
Salas is offline Salas  Greece
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Originally Posted by RCruz View Post
Will try a noise analisys before implementation.

Can we get lower noise with bjt CCS ?
Not sure, it depends on rbb' and bias current. You would need genuine low noise BJTs that can take the dissipation also.
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Old 11th January 2015, 06:56 PM   #13979
RCruz is offline RCruz  Switzerland
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Yes... True... I simmed it with common bjt's that can not take the heat.... just for fun
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Old 11th January 2015, 07:55 PM   #13980
merlin el mago is offline merlin el mago
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Merlino, are you running single ended or balanced?
Ciao Orelli, now SE but due to the high SQ I'm thinking to go balanced in the future.
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