Simplistic NJFET RIAA - Page 51

Salas · 13th December 2008, 06:19 PM

Page12, post 299, has it ready for you @ 24V.

Cheers

Salas

es44 · 13th December 2008, 06:48 PM

Wow, thanks a lot Salas, i missed that one, and i even read the whole thread all over again earlier today

Back to the Pcb-layout program now :-)

All the best
Ebbe

Marinos · 17th December 2008, 05:08 PM

Hi salas,

I would like to build your phono preamp but he thread has grown.. and reading through it makes me uncertain which schematic should I follow.

I'm intersted to the high gain version ( my cartridge is at the 0,3 mV ballamrk ) but what finally is your suggestion

- with or without cascoding ?
- shunt regulator with or without leds ? (where does the sound of batterries stand compared to the shunt ?)

Thank you in advance for your help,
Marinos

Salas · 17th December 2008, 06:39 PM

Hi,

Tell me about your amps and speakers so I can help you better with what may be subjectively more suitable.

Marinos · 17th December 2008, 06:56 PM

Speakers: 2 way (focal tweeter + 2 8"audax aerogel ) in a 84 lt reflex enclosure and minimal crossover (MTZ design)

Amps: Holton's NXV 200 Mosfet modules

Salas · 17th December 2008, 07:08 PM

Use my post #110 (if you have more than 50k line in, else add a buffer), plus Led shunt.
Batteries are no good in general, even not as good as a decent series reg. You will see I used them as a test PSU when I was developing the Riaa on those earlier posts. This particular shunt is something you wanna listen to. Give it a go.

Marinos · 17th December 2008, 07:20 PM

Thanks salas.

Does the SB phono with your HV shunt regulator reclaim its head position sonically ?

es44 · 17th December 2008, 07:23 PM

Man i'm struggling here, i think i told You all, that i'm no expert, but usually i can manage.
But this one's killing me. I have made a PCB, and to my eyes, there's no errors. Is there anybody here, who would look at it and tell me what i've done wrong ?
I'm sure i have, i just can't see it after staring for hours, and comparing with schematic.

Best regards
Ebbe

Schematic:

Salas · 17th December 2008, 07:23 PM

Marinos:

I don't understand. SB?

EDIT: Maybe you mean Steve Bench? I haven't compared much, but I would say 95% the same. Only the tube one is much costlier and needs much more work.

es44 · 17th December 2008, 07:24 PM

And here's PCB.

I forgot to say, that i have 1.4 volts out, and R3 gets hot. All transistors and Fet's measured just in case, they are ok.

17th December 2008, 05:08 PM	#503
Marinos diyAudio Member Join Date: Mar 2003 Location: Athens	Hi salas, I would like to build your phono preamp but he thread has grown.. and reading through it makes me uncertain which schematic should I follow. I'm intersted to the high gain version ( my cartridge is at the 0,3 mV ballamrk ) but what finally is your suggestion - with or without cascoding ? - shunt regulator with or without leds ? (where does the sound of batterries stand compared to the shunt ?) Thank you in advance for your help, Marinos __________________ Marinos

17th December 2008, 06:56 PM	#505
Marinos diyAudio Member Join Date: Mar 2003 Location: Athens	Speakers: 2 way (focal tweeter + 2 8"audax aerogel ) in a 84 lt reflex enclosure and minimal crossover (MTZ design) Amps: Holton's NXV 200 Mosfet modules __________________ Marinos

17th December 2008, 07:20 PM	#507
Marinos diyAudio Member Join Date: Mar 2003 Location: Athens	Thanks salas. Does the SB phono with your HV shunt regulator reclaim its head position sonically ? __________________ Marinos

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13th December 2008, 06:19 PM	#501
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Page12, post 299, has it ready for you @ 24V. Cheers Salas

13th December 2008, 06:48 PM	#502
es44 diyAudio Member Join Date: Apr 2005 Location: Fredericia, DK	Wow, thanks a lot Salas, i missed that one, and i even read the whole thread all over again earlier today Back to the Pcb-layout program now :-) All the best Ebbe

17th December 2008, 06:39 PM	#504
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Hi, Tell me about your amps and speakers so I can help you better with what may be subjectively more suitable.

17th December 2008, 07:08 PM	#506
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Use my post #110 (if you have more than 50k line in, else add a buffer), plus Led shunt. Batteries are no good in general, even not as good as a decent series reg. You will see I used them as a test PSU when I was developing the Riaa on those earlier posts. This particular shunt is something you wanna listen to. Give it a go.

17th December 2008, 07:23 PM	#509
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Marinos: I don't understand. SB? EDIT: Maybe you mean Steve Bench? I haven't compared much, but I would say 95% the same. Only the tube one is much costlier and needs much more work.

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