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Old 28th February 2006, 09:51 AM   #1
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Question Differential output phono stage PCB

The circuit is a differential output stage using 2 2sk389, based in the Pass Pearl. It should be connected after the passive RIAA stage. I plan to put the board stacked on top of the Pearl board.

The board I am working is attached below. Please keep in mind that this is my first pcb design. I would appreciate the guidance of someone more expert.

Note that I already posted more details in this thread at the pass labs forum, but I didn't get many answers.

Thanks
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Old 28th February 2006, 09:57 AM   #2
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An easier view ...
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Old 28th February 2006, 02:02 PM   #3
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And here the schematic...
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Old 28th February 2006, 05:14 PM   #4
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Look at Q6 in your schematic!

Cheers Michael
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Old 28th February 2006, 05:42 PM   #5
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Oops! Q6 should go the other way around.

The filters for both rails were initially part of a different schematic. I made a mistake when I moved it here. I will update both this mistake and the one for the negative rail which is absent.

Michael, thanks for warning.

Xavier
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Old 28th February 2006, 06:02 PM   #6
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Actually it may be so that you wouldn't ever notice it in a real circuit as BJT's works also backwards!

Cheers Michael
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Old 28th February 2006, 06:26 PM   #7
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OK. Here it is the updated schematic. I should update Q6 and Q9 in the layout, but I will wait until I have more things to correct to produce a new version.

Any comments on the layout?
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