Differential output phono stage PCB

xavier1000 · 28th February 2006, 09:51 AM

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

xavier1000 · 28th February 2006, 09:57 AM

An easier view ...

xavier1000 · 28th February 2006, 02:02 PM

And here the schematic...

Ultima Thule · 28th February 2006, 05:14 PM

Look at Q6 in your schematic!

Cheers Michael

xavier1000 · 28th February 2006, 05:42 PM

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

Ultima Thule · 28th February 2006, 06:02 PM

Actually it may be so that you wouldn't ever notice it in a real circuit as BJT's works also backwards!

Cheers Michael

xavier1000 · 28th February 2006, 06:26 PM

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?

28th February 2006, 05:14 PM	#4
Ultima Thule diyAudio Member Join Date: Jan 2004 Location: Koskenkorva Land	Look at Q6 in your schematic! Cheers Michael __________________ "If transistors are blueberries and FETs are strawberries, then tubes must be.. pears" Michael 29th January 2010

28th February 2006, 06:02 PM	#6
Ultima Thule diyAudio Member Join Date: Jan 2004 Location: Koskenkorva Land	Actually it may be so that you wouldn't ever notice it in a real circuit as BJT's works also backwards! Cheers Michael __________________ "If transistors are blueberries and FETs are strawberries, then tubes must be.. pears" Michael 29th January 2010

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28th February 2006, 05:42 PM	#5
xavier1000 diyAudio Member Join Date: Feb 2005 Location: Barcelona	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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