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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 20th December 2012, 08:32 AM   #8871
atupi is online now atupi  Romania
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After moving output cap outside of pcb forget to move also the 1M output resistor. I will do this and check if problems still persist.
I'm using russian K75-10 2.2uf capacitors.
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Old 20th December 2012, 09:23 AM   #8872
massimo is offline massimo  Italy
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Salas, referring to the latest RIAA folded cascode sch, what's the purpose of R4 2,2kohm?
It's a load for the f.c. itself or whatever?

Thank you!
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Old 20th December 2012, 09:24 AM   #8873
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
R4 is the cascode load... it is referenced to gnd... less noise from that part
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Old 20th December 2012, 09:48 AM   #8874
nicoch58 is offline nicoch58  Europe
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HOORAY for SALAS

What a great work !!

and to all
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Old 20th December 2012, 09:49 AM   #8875
massimo is offline massimo  Italy
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Thank you Ricardo. The low value puzzled me a bit. Thus this R is affecting (lowering I guess) the o/p impedance of the front end and the riaa network as well.
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Old 20th December 2012, 09:55 AM   #8876
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
yes... this 2k2 affects the riaa strongly.
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Old 20th December 2012, 04:20 PM   #8877
Salas is online now Salas  Greece
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Simplistic NJFET RIAA
Quote:
Originally Posted by atupi View Post
After moving output cap outside of pcb forget to move also the 1M output resistor. I will do this and check if problems still persist.
I'm using russian K75-10 2.2uf capacitors.
After reinstalling the resistors check DCmV on those NOS hybrid caps (output side to GND) to see if they could be leaky also or not.
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Old 23rd December 2012, 08:47 PM   #8878
Doug R is offline Doug R  United States
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OK,
I am winding up things chassis-wise. Here are a couple of teaser photos. I will post some more in a few days.

First learning experience: I had a bolt through the toroid trafo that touched the chassis. (I've never used a toroid before.) Had a 20 volt difference between circuit ground and safety ground. I'll get a nylon bolt.

Dumb question: where can I hook an indicator LED without messing up the circuits? The resistors I have in the raw PS drop less than a volt.

Thanks. More to come.
Doug
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Old 23rd December 2012, 09:04 PM   #8879
DARIO1997 is offline DARIO1997  Italy
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Hi Salas,
I have already built your RIAA Jfet a year ago.
The project has had an update or is it always the same?
Regards
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Old 23rd December 2012, 09:14 PM   #8880
Salas is online now Salas  Greece
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Simplistic NJFET RIAA
Look at post #8723
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