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Old 12th December 2007, 09:34 PM   #1
tadiam is offline tadiam  Argentina
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Default Size dilemma question?

In this year build some amps prototypes and sound good ..only good. (doz ..esp.. gainclones rotels..arcams..fets..naims..Hk…Dx..regas…albarry. ..and much more)but have an question…when exchange some components in the main fiberglass of the my protoamps the sound exchange too….but the question is :

How sound the same prototypes in half size fiberglass board?...more…more small size.
This affects the amp sound?
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Old 13th December 2007, 04:38 PM   #2
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If I understand you correct, you ask if the sound will be affected if you make the prototype board smaller ?

If so, it could affect the sound both ways;
In a good way because the signal path gets shorter....
In a bad way because you may have high power tracks very close to small signal tracks...

Always think when making layouts
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Old 13th December 2007, 04:50 PM   #3
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tadium: " How [is the] sound [changed by] the same prototypes [on smaller] half size fiberglass board?"

ACD: " If so, it could affect the sound both ways;
" In a good way because the signal path gets shorter....
" In a bad way because you may have high power tracks very close to small signal tracks... "

Pardon my re-interpretation of your original question(s).

I agree with ACD, as signal pathways change in length and / or size the sound reproduced will often be somewhat different. Also the board material, if different, can have a dramatic effect on the sound, mostly because of the different capacitance (different dielectric material) between signal paths on the board. ACD is also correct: reducing the physical size of a circuit board will certainly bring the signal traces closer to the power traces, adding to the crosstalk and impedance changes.

Sometimes there is magic in the way a certain project was designed and scaling it down or up can dramatically change the end results.

(I really like ADC's ultra flat power MOSFET amp board pictured on his web site ... )
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Old 13th December 2007, 04:54 PM   #4
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Old 13th December 2007, 05:00 PM   #5
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ACD: Your flat amp board ... do you have an equally flat power supply filter board ... I am building amps in "one up" rack mount chassis and those tall capacitors present a problem (even when using switching supplies).
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Old 13th December 2007, 07:49 PM   #6
tadiam is offline tadiam  Argentina
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and the winner is....? small board... medium board o big size board?
maybe wire point to point the components type old valve style?
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Old 13th December 2007, 08:08 PM   #7
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Winner for size selection?

IMHO chose the trace size to suit your amp power (pre-amp = smaller, power amp larger, big power amp quite large), then generally accepted good practice dictate the resulting board size required. For a good example see the 150 Watt board that ACD builds at his web site = that "flat" amp board ... ... note the "fat" traces where the power is routed, the slim traces back in the low power section(s) ... I estimate that board to be about 3" by 7" ...
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Old 13th December 2007, 10:21 PM   #8
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Use standard SMD size 201 resistors

http://www.koaspeer.com/pdfs/res5.pdf

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Old 14th December 2007, 07:12 PM   #9
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Quote:
Originally posted by CBS240
Use standard SMD size 201 resistors

http://www.koaspeer.com/pdfs/res5.pdf

I GUESS YOU'R STILL YOUNG ENOUGH TO SEE THEM
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