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24th October 2008, 12:21 AM
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#1 |
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diyAudio Member
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
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Wadia Digimaster X64.4 Help!
Hi, so I don't have to mangle the lovely gold cover that hides/covers them, does anyone one know what and how many, and in what configuation are the DA convertors underneath?
As I wish to try a different discrete I/V circuit and output circuit board in place of the Sledgehammer board they came with. Cheers George |
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24th October 2008, 07:47 AM
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#2 |
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diyAudio Member
Join Date: Dec 2003
Location: Sydney
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Careful now... the other place may ban you for posting here as well as there....
Boky |
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24th October 2008, 09:03 AM
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#3 |
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diyAudio Member
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
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?
People aren't that petty, I just asking for info, no big crime. George |
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1st November 2008, 06:43 AM
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#4 |
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diyAudio Member
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
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Right covers are off, thanks to the cranky old fart from the other place, they are PCM56PK and the opamps are OPA606 mine may have the PCM61PK in as it is a later model, and Wadia rebadged them and the OPA's. This circuit looks as thou they try get a balanced output from a single ended I out from the 4 xDac's how do you guys see this?
Sorry the three yellows and the black go to the Sledgehammer output board which has 2 x HA-5002 opamps per channel, that's impossible to trace as it's multi layered board, it has balanced and single ended outputs Cheers George |
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1st November 2008, 06:46 AM
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#5 |
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diyAudio Member
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
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My dac board
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1st November 2008, 06:48 AM
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#6 |
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diyAudio Member
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
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The cranky ones older? board 1 channel
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1st November 2008, 07:00 AM
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#7 |
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diyAudio Member
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
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And one more overhaul look
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1st November 2008, 10:40 PM
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#8 |
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diyAudio Member
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
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This is one of the Transimpedance amps I was thinking of trying out. I out (pin 13) of all 4 dacs straight to the input has it's own dc servo is direct coupled good balanced or single ended output stage. Any comments?
Cheers George |
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3rd November 2008, 11:21 AM
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#9 |
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diyAudio Member
Join Date: Dec 2006
Location: Avignon, France
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Hi,
Before you replace I/V stage, you might change decoupling capacitors. It seems to be Z5U, the worst capacitors that exist ! How (Not) to Decouple High-Speed Operational Amplifiers Eric |
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3rd November 2008, 12:49 PM
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#10 |
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diyAudio Member
Join Date: Aug 2004
Location: Italy
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Hi,
I have always cosidered wadia as state of the art DAC. It sounds! But also I have thinked I/V stage and output stage are the weak point. Have you considered a passive I/V stage or transformer?  Cheers, Paolo |
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