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cjkpkg 25th November 2008 02:27 AM

PCB advice
 
I am playing around with the design for my aikido line stage that I want to integrate a phono stage into. I have been weighing between some type of board stuffed guts or point to point for the phono section and still can not decide.

I drew up this little PCB section today...I would do the old copper board - toner transfer technique with this.

Does this board layout look OK? I have never laid out a board before...

The schematic is the RJM 6DJ8 phono stage - with the suggestion of having the tubes run in series instead of parallel - I.E...each tube has a L and R channel instead of a dedicated L tube and R tube...

http://i10.photobucket.com/albums/a1...phonoboard.jpg

HollowState 25th November 2008 02:57 AM

My advice would be to post a smaller picture. This one stretches more then twice my monitor's width and is very annoying. It also streches the text with it. Whenever I see a post like this I click away and don't bother with it.

cjkpkg 25th November 2008 11:39 AM

Quote:

Originally posted by HollowState
My advice would be to post a smaller picture. This one stretches more then twice my monitor's width and is very annoying. It also streches the text with it. Whenever I see a post like this I click away and don't bother with it.

Point taken....

ErikdeBest 25th November 2008 01:57 PM

Hi

a very small contribution: At the left socket pins 4 and 5 are shorted.

cjkpkg 25th November 2008 02:05 PM

Ahhh...thanks for that catch!!! I figure I should post the schematic too - if that helps any...

http://i10.photobucket.com/albums/a1...phonostage.jpg

cjkpkg 26th November 2008 08:18 PM

OK...Here is the latest. I realized that I also needed to run the filaments in series versus parallel...I think I did it right...

Carl
http://i10.photobucket.com/albums/a1...honostage1.jpg

nigelwright7557 26th November 2008 09:30 PM

Thicker tracks where possible, always makes etching easier/better and helps save the planet too !

Why have you got red and green tracks, that usually means you have two layers ?

cjkpkg 26th November 2008 10:46 PM

Quote:

Originally posted by nigelwright7557
Thicker tracks where possible, always makes etching easier/better and helps save the planet too !

Why have you got red and green tracks, that usually means you have two layers ?

I visualized the red for hot and the green for ground. The board is all one layer. It made it easier to track the circuit...

HollowState 26th November 2008 10:54 PM

Quote:

Originally posted by cjkpkg
OK...Here is the latest. I realized that I also needed to run the filaments in series versus parallel...I think I did it right...

Hi Carl,
If I were going to layout a circuit board for this preamp, I would do it in such a way as to not run any traces through two adjacent tube pins. I would also limit it to only one trace going through the 1-9 pin space. Even if you have to use wire jumpers on the top surface to accomplish this. Cramming three lines through the 1-9 opening is not good layout practice in my opinion.

Also, the filament lines should be the widest of them all because they carry the most current. Your's are the thinner of the bunch. Signal lines could be thinner if necessary because they carry virtually no power, although I see no need for that with this simple circuit.

I'll admit that I have no experience with computer aided circuit board design because anything I did years ago was by paper and pencil. But the CAD programs of today should make things much easier. Perhaps give it another try.

Victor

cjkpkg 2nd December 2008 01:11 AM

Here is the etched board. I still need to drill the traces for the components. I think it turned out pretty nice...
http://i10.photobucket.com/albums/a1...e/phonopcb.jpg


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