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Old 22nd October 2003, 05:21 PM   #1
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Default 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
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Old 22nd October 2003, 06:32 PM   #2
dimitri is offline dimitri  United States
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That pretty stupid thing is here:
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Old 26th October 2003, 03:32 AM   #3
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Quote:
Originally posted by dimitri
That pretty stupid thing is here:

What makes it stupid? (just curious)
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Old 26th October 2003, 06:03 AM   #4
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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
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Old 26th October 2003, 06:16 AM   #5
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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
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Old 26th October 2003, 01:06 PM   #6
dimitri is offline dimitri  United States
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R12 should be 1k5, R9 left pin should be connected to ground instead the 4580 output. And this is only for a start
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Old 28th December 2003, 05:36 AM   #7
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Hello,

a few pics of the Phono Box:

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

Enjoy the overlay picture!

Stefan
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Old 1st June 2004, 05:14 PM   #8
Zombie is offline Zombie  Sweden
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Default 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
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Old 1st June 2004, 06:54 PM   #9
mandat is offline mandat  Poland
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Dimitri do not talk in puzzled way, because....

http://www.angelfire.com/az3/dimitri...s/phonobox.pdf
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Old 1st June 2004, 09:06 PM   #10
Zombie is offline Zombie  Sweden
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Default Great!

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

Tom
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