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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?

Thanks for any inf


dimitri 22nd October 2003 06:32 PM

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

uniuniunium 26th October 2003 03:32 AM


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.

analog_sa 26th October 2003 06:16 AM


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


a few pics of the Phono Box:

Enjoy the overlay picture!


Zombie 1st June 2004 05:14 PM

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


mandat 1st June 2004 06:54 PM

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

Zombie 1st June 2004 09:06 PM

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

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