Simplistic NJFET RIAA - Page 25

Salas · 14th November 2008, 09:08 PM

Quote:

Originally posted by Thomo
Just a thought, but I could easily build a Sulzer/Borbely type voltage reg into the layout of the board.

Would be nice to discover how good the Salas reg posted above is first though.

I will try and get a stereo board etched tomorrow and test.

Cheers, Lee.

That Sulzer/Borbely voltage reg will be very silent non the less.
You mean something like in this thread ?

RCruz · 14th November 2008, 09:22 PM

Quote:

Originally posted by salas

OK, here you are.

Thank you so much Salas.

kstlfido · 15th November 2008, 01:10 AM

Thx Lee for the layout. I will probably go with point to point for now until I gel down what sounds best.

Salas- I guess the Salas 'pacific' style RIAA from post 110 is now out of date? I ordered all my parts for that schem already.

How does this new one in post 236 compare?

-Kent

Salas · 15th November 2008, 01:15 AM

No it is not outdated. Its totally comparable. Proceed with confidence. The PSU choice will make the biggest difference.

Salas · 18th November 2008, 03:16 PM

Good news. My proposed shunt works straight away without any problems. Initial impression is a substantial lift in musical detail. Will evaluate more and enhance the Vref (Zener) with its own CCs and extra cap.

cygnus x1 · 18th November 2008, 04:53 PM

Salas,
You beat me to the punch, as I just got around to testing the shunt-reg. Yes it works as designed. So everyone is safe using it as-is. I was also thinking about adding the CCs for Vref and bypass.
I have deveated from your design a little bit (as I'm a tube guy at heart) and replaced the second stage with a CCs 6DJ8 and a Mosfet follower (ala NYAL and Joe Curcio). Yes you can run the 6DJ8 at this low voltage. I was running a whole RIAA tube design on 24 volt battery. I also use a pair of fets and cascode for the first stage (kinda like the pearl design) to lower the noise. When I get it all sorted out, I will post a schematic.

Salas · 18th November 2008, 06:38 PM

Good.

Hope it sounds cool too. Does the trick in my case.

nicoch58 · 18th November 2008, 06:59 PM

HI SALAS

For +/- Psu ?

Salas · 18th November 2008, 07:29 PM

Have to mirror it, its easy. I have no use for a -V in my RIAA though.

jam · 18th November 2008, 10:56 PM

Salas,

Just a thought, try 1uF at the output of the regulator in place of 2200 uF.

Jam

15th November 2008, 01:10 AM	#243
kstlfido diyAudio Member Join Date: Mar 2006 Location: Berkeley, CA	Salas 'pacific' style RIAA Thx Lee for the layout. I will probably go with point to point for now until I gel down what sounds best. Salas- I guess the Salas 'pacific' style RIAA from post 110 is now out of date? I ordered all my parts for that schem already. How does this new one in post 236 compare? -Kent

18th November 2008, 06:59 PM	#248
nicoch58 diyAudio Member Join Date: Oct 2004	HI SALAS For +/- Psu ? __________________ Sic58

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15th November 2008, 01:15 AM	#244
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	No it is not outdated. Its totally comparable. Proceed with confidence. The PSU choice will make the biggest difference.

18th November 2008, 03:16 PM	#245
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Good news. My proposed shunt works straight away without any problems. Initial impression is a substantial lift in musical detail. Will evaluate more and enhance the Vref (Zener) with its own CCs and extra cap.

18th November 2008, 04:53 PM	#246
cygnus x1 diyAudio Member Join Date: Sep 2006	Salas, You beat me to the punch, as I just got around to testing the shunt-reg. Yes it works as designed. So everyone is safe using it as-is. I was also thinking about adding the CCs for Vref and bypass. I have deveated from your design a little bit (as I'm a tube guy at heart) and replaced the second stage with a CCs 6DJ8 and a Mosfet follower (ala NYAL and Joe Curcio). Yes you can run the 6DJ8 at this low voltage. I was running a whole RIAA tube design on 24 volt battery. I also use a pair of fets and cascode for the first stage (kinda like the pearl design) to lower the noise. When I get it all sorted out, I will post a schematic.

18th November 2008, 07:29 PM	#249
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Have to mirror it, its easy. I have no use for a -V in my RIAA though.

18th November 2008, 10:56 PM	#250
jam diyAudio Member Join Date: May 2001 Location: Charlotte,NC,USA	Salas, Just a thought, try 1uF at the output of the regulator in place of 2200 uF. Jam

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