Schematic for Pro-ject phono box

Smiffy · 22nd October 2003, 06:21 PM

Hi All
Anyone know where I can get the schematic for the Pro-ject phono box?

http://e-dizain.de/project/en/phonobox.html

Thanks for any inf

Smiffy

dimitri · 22nd October 2003, 07:32 PM

That pretty stupid thing is here:

uniuniunium · 26th October 2003, 04:32 AM

Quote:

Originally posted by dimitri
That pretty stupid thing is here:

What makes it stupid? (just curious)

Smiffy · 26th October 2003, 07:03 AM

Dimitri was kind enough to send me some measurements of the unit showing it to be somewhat out with regards to its RIAA response.
Smiffy

analog_sa · 26th October 2003, 07:16 AM

Quote:

What makes it stupid?

An input coupling cap, an elco that seems part of a filter, a servo around the input stage - all this is a bit strange to say the least

dimitri · 26th October 2003, 02:06 PM

R12 should be 1k5, R9 left pin should be connected to ground instead the 4580 output. And this is only for a start

radiosepp · 28th December 2003, 06:36 AM

Hello,

a few pics of the Phono Box:

http://home.arcor.de/bauer77/_privat..._phono_box.htm

Enjoy the overlay picture!

Stefan

Zombie · 1st June 2004, 06:14 PM

Hello!
I'm thinking about modding or improving the Phonobox.
I have some OPA604, 134 and 637 in my box, are they drop-in replacements?

There are some ceramic caps on the card, too. And elcos

Earlier some people suggested there were some "faults" in the circuit, is there anything one can do?

What about increasing the output level a bit?

Got some experience with modding CD:s so difficult jobs don't scare me

- I totally lack theoretical skills, but understand schematics, so if ou can help me - thanx!

Tom

mandat · 1st June 2004, 07:54 PM

Dimitri do not talk in puzzled way, because....

http://www.angelfire.com/az3/dimitri...s/phonobox.pdf

Zombie · 1st June 2004, 10:06 PM

Thank you Mandat and Dmitri!
Lots to think about there...

Tom

22nd October 2003, 06:21 PM	#1
Smiffy diyAudio Member Join Date: Aug 2002 Location: UK	Schematic for Pro-ject phono box Hi All Anyone know where I can get the schematic for the Pro-ject phono box? http://e-dizain.de/project/en/phonobox.html Thanks for any inf Smiffy

1st June 2004, 06:14 PM	#8
Zombie diyAudio Member Join Date: Feb 2003 Location: At home	Modding the phonobox? Hello! I'm thinking about modding or improving the Phonobox. I have some OPA604, 134 and 637 in my box, are they drop-in replacements? There are some ceramic caps on the card, too. And elcos Earlier some people suggested there were some "faults" in the circuit, is there anything one can do? What about increasing the output level a bit? Got some experience with modding CD:s so difficult jobs don't scare me - I totally lack theoretical skills, but understand schematics, so if ou can help me - thanx! Tom

1st June 2004, 10:06 PM	#10
Zombie diyAudio Member Join Date: Feb 2003 Location: At home	Great! Thank you Mandat and Dmitri! Lots to think about there... Tom

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26th October 2003, 07:03 AM	#4
Smiffy diyAudio Member Join Date: Aug 2002 Location: UK	Dimitri was kind enough to send me some measurements of the unit showing it to be somewhat out with regards to its RIAA response. Smiffy

26th October 2003, 02:06 PM	#6
dimitri diyAudio Member Join Date: Oct 2002 Location: retired	R12 should be 1k5, R9 left pin should be connected to ground instead the 4580 output. And this is only for a start

28th December 2003, 06:36 AM	#7
radiosepp diyAudio Member Join Date: Dec 2003 Location: berlin	Hello, a few pics of the Phono Box: http://home.arcor.de/bauer77/_privat..._phono_box.htm Enjoy the overlay picture! Stefan

1st June 2004, 07:54 PM	#9
mandat diyAudio Member Join Date: Oct 2003 Location: Gliwice	Dimitri do not talk in puzzled way, because.... http://www.angelfire.com/az3/dimitri...s/phonobox.pdf