Arduino Duemilanove or Mega  C6, C7

Forum 2005-2010 (read only) Hardware Development
1

Arduino Duemilanove or Mega :
In the Schematic , CAPACITOR C6, C7 is 100uF, however in the board I find it is 47uF or 10uF.
Why?

2

They are power supply filters. The caps should be matched to the particular type of regulator, and there is frequently a range of values that will work.

for instance, of the data sheet says 10uF to 100uF and you get a good deal on 47uF caps, or you're using a 47uF elsewhere in the design but not a 100uF (you can reduce your parts count by one), it's in your interest to use a 47uF.

-j