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Old 1st June 2002, 02:15 PM   #21
diyAudio Member
 
Join Date: Mar 2002
Location: CROATIA
Hello,


I used separate PCBs for each channel and without silkscreen overlay, because they were the first prototypes for the Balanced Line Stage preamplifier.

Also, the all PCBs that are located on my homepage :
( http://web.vip.hr/pcb-design.vip ) are made of FR-4 fiberglass material with Cu-50 mikron + Pb track overlay (tinplated),
laser drilled, with two sided blue soldermask (instead of green), and with white component overlay.




Regards,
Kristijan Kljucaric
 
Old 4th June 2002, 08:18 PM   #22
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Join Date: May 2002
Hi Kristijan,


Thank you for the explanation.

Are there any sound difference between green and blue soldermask that you use ?

Do you work with other colors ?
 
Old 5th June 2002, 10:29 AM   #23
diyAudio Member
 
Join Date: Mar 2002
Location: CROATIA
Hello,


There is no way for any sonic difference between green and blue
soldermask.

I do my PCBs only with the blue color soldermask, but if desired they also can be made with standard green.



Regards,
Kristijan Kljucaric
 
Old 6th June 2002, 07:12 PM   #24
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Join Date: May 2002
hi,

Thank you for clearing that out for me.
I was a little confused about the blue soldermask on your PCBs.
I never saw the blue ones before.


When the power supplies for the preamplifiers will be available, and why they are not located on the same PCB with the main circuit ?
 
Old 7th June 2002, 11:32 AM   #25
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Join Date: Mar 2002
Location: CROATIA
Hello,


The power supply PCBs will be available in about couple of weeks.

The power supply is not located on the preamplifier PCB.
The reason that is designed that way, is that the power supply can be builted in the separate enclosure, if desired.
Also, there is less chance for the noise pick-up, if the power supply would be moved away from the main circuit.



Regards,
Kristijan Kljucaric
 
Old 8th June 2002, 09:26 PM   #26
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Join Date: May 2002
hi,

is it possible to use the power supply from the balanced line stage preamplifier on the aleph p 1.7 (single rail) ?

anyone tried ?
is there some better power supply ?
 
Old 17th June 2002, 04:17 PM   #27
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Join Date: Mar 2002
Location: CROATIA
Hello Dornier,


It is possible to use the "1/2" BLS power supply for the Aleph p 1.7.
However, you should increase the capacity of the capacitors that are located after rectifier diodes.
Also, mount the Fets on the small heatsinks, and increase power rating of the transformer.



Regards,
Kristijan Kljucaric
 
Old 19th June 2002, 03:25 PM   #28
diyAudio Member
 
Join Date: May 2002
hi,

what would be the right transformer power rating for the Aleph p 1.7 preamplifier ?
 
Old 20th June 2002, 06:56 PM   #29
diyAudio Member
 
Join Date: Mar 2002
Location: CROATIA
Hello,

With the 150 VA you should have no problems, but if you can, try to use a little larger one.
I tried 250 VA transformers per each channel and in the separate enclosure, and they worked very cool and quiet.

Regards,
Kristijan Kljucaric
 
Old 20th June 2002, 09:48 PM   #30
swede is offline swede  Switzerland
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Join Date: Sep 2001
Location: Geneva, Switzerland
Default PCB design process

Hi,

I'm very impressed by your PCB's. What do you do for a living... EE, Board designer?

Well, since you seem to be such a talent in the field of PCB manufacturing, could you please (pretty please with sugar on top) tell us (less talented) how you do it? Are you doing it all in a design program, and then send a file of some format to a board manufacturer? Or do you design the boards in a program, printing it, etching boards at home and test them out in some mysterious way and let the boards evolv iteratively before you get them manufactured? Or do you silk-screen your board at home during some mysterious ritual?

I do want to become as good as you in making boards, but I have no clue on how to do so.

Internet is such a fantastic place for learning new stuff.

Best regards,
//magnus
 

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