Few Gc questions from newbie

[rs1026]

Hi I had few questions wrt lm3886 GC that I am building.

1.What is the minimum trace width allowed for power and gnd signals?
2.Will there be any problems if traces are small?

Please look at figure of the PCB that I have designed below.This is first PCB that I have designed so there may be lot of issues.I would be glad if someone can give me some pointers.

[janneman]

There is no firm-fixed rule for trace width. You geberally want to have the high current traces (supply, ground, output) as fat as possible to reduce the resistance, but anything above a few mm can carry several amps continuous, more if only a peak once in a while (like music).

With inputs to differential amps, you would want to try to keep them apart (also the output to the +input) to avoid unwanted coupling which could give you instability.

Without having the parts placement, your layout looks pretty OK, especially if it is your first layout! I don't see any obvious problems, but if you ask for comments you should overlay a parts placement that people can refer to a schematic.


Jan Didden