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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 16th April 2009, 09:17 PM   #1651
nicoch58 is offline nicoch58  Europe
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Ricardo look here
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Old 16th April 2009, 10:57 PM   #1652
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
Thank you nicoch46

I will now master in snubbers.

Please do not take my further actions as fundamental because the sound of the Riaa (10 hours latter) is becoming awesome... I can even listen to old records ! The image and detail are so strong I can really understand what was the original idea of the musitians ...

The residual noise I am trying to defeat is buried deep in the vinyl surface noise

I just want to get the best of the best "Primus Inter Pares" riaa.

Ricardo
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Old 16th April 2009, 11:07 PM   #1653
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
I am happy that you like it.
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Old 17th April 2009, 09:49 AM   #1654
AndrewT is offline AndrewT  Scotland
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if the noise coming out of the RIAA pre is too low for your equipment to measure, then amplify it and try measuring the difference in noise after the amplifier to make comparisons.
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Old 17th April 2009, 05:57 PM   #1655
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
Thank you AndrewT

I will try that.

Now I am wondering if using fast diodes /soft recovery like the hexfred, I would benefit from some kind of damping / snubering

Ricardo
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Old 17th April 2009, 09:40 PM   #1656
nicoch58 is offline nicoch58  Europe
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if sound good..... some thinks that snubber ore not so good


shottky do not ring but still ring !
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Old 17th April 2009, 09:55 PM   #1657
nicoch58 is offline nicoch58  Europe
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erno put snubber on byv27 , I live in place when I put stealt2 ,more detail but some edge ,cured after when I put nichicon KG ... but need to try without...

difficult see ring with scope ....and no one solution, trafo-diode caps work together...

interesting the resitor 0,1r series and 1kparallel to dump trafo in my link back ,or beetween diode and caps

http://www.hagtech.com/pdf/snubber.pdf
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Old 17th April 2009, 10:06 PM   #1658
nicoch58 is offline nicoch58  Europe
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there is T-network caps at half price if you want burn some money , fortunately you need only two


jensen 4pole (F&T stuff as mundorf....)

he Jensen totally wipes the floor with the other two capacitors. Above 10KHz there is nothing left of the noise. At 5KHz the noise already dips below 1V (-120dBV).
I don't know about you,but I'll gladly pay 33,- for this kind of an improvement. look
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Old 17th April 2009, 10:29 PM   #1659
nicoch58 is offline nicoch58  Europe
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Salas what you thinks about Charge transfer" power supply from -ECdesigns to isolate /float the diodelink

and new rev here
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Old 17th April 2009, 10:43 PM   #1660
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
Don't know, haven't made such.
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