piclist 2000\06\06\092403a >
Thread: Filter Capacitors
www.piclist.com/techref/logic/dsps.htm?key=filter
picon face BY : Peter Betts email (remove spam text)



Simply, Low frequency noise or fluctuations on the power supplies are
smoothed over as the LARGE capacitor sources extra current into the circuit
or sinks extra current keeping the supply to the ciruit more or less
constant.
It acts as a big reservoir of power.

High frequency noise is filtered out by adding a smaller capacitor which
dumps the excess noise onto the ground (0V)

There's probably some equation for it but I basically always put a 100uF cap
on for the low freq's and a 100nF for the high frequecies. It's worked on
all my projects so far.

Pete

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