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Old 4th May 2008, 04:15 AM   #1
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Join Date: Dec 2002
Location: Houston
Default Decouping caps om chip pins

Last seven amps I have built used small caps, 10 - 22ufd, rioght on the power pins. With the LM3886 all have been with + attached to pin three and - soldered to pin4. Pin 5 in used for ground as the board used has this as ground plane.
To make it a little less crowded this last time, I attached the positive to pin 1. Pin 1 and 3 are connected via a trace. The distance the trace travels is maybe 1 cm. Seems like there is a decrease in dynamics, slam, and deep bass. I need to pull board and move the + bypass cap to pin 3 to verify.
Is it possible that it is better to solder the cap to pin 3 instead of pin 1 with both tied togeether on the circuit board?

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Old 4th May 2008, 12:19 PM   #2
AndrewT is online now AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
It is very possible that the current requirements of the two positive supply pins are very different.

I am sure I speak for all by asking you to go ahead with this comparison and report your results.
regards Andrew T.
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