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-   -   Schematic for Pro-ject phono box (http://www.diyaudio.com/forums/analogue-source/21833-schematic-pro-ject-phono-box.html)

Smiffy 22nd October 2003 05:21 PM

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

dimitri 22nd October 2003 06:32 PM

2 Attachment(s)
That pretty stupid thing is here:

uniuniunium 26th October 2003 03:32 AM

Quote:

Originally posted by dimitri
That pretty stupid thing is here:

What makes it stupid? (just curious)

Smiffy 26th October 2003 06:03 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 06:16 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 01:06 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 05:36 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 05:14 PM

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
:smash:

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

Tom

mandat 1st June 2004 06:54 PM

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

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

Zombie 1st June 2004 09:06 PM

Great!
 
Thank you Mandat and Dmitri!
Lots to think about there...
:bigeyes:
Tom


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