I assume that you are wanting to smooth out voltage ripple- basically this
means that you want to put a capacitor between the line you want to filter
and ground.  Make sure that the capacitor is rated at a high enough voltage,
and know that the larger the value of the capacitor => the lower frequency
of ripple that you will be able to filter out.  Lastly, make sure to always
observe the polarity of a Cap. or else it could pop on you... literally!

Brandon



-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Brendan Moran
Sent: Tuesday, June 25, 2002 7:13 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: Anyone speak decoupling/filter caps?


Whups, forgot to mention placement.  As near to power leads of any chip as
possible.  That way you don't have the resistance of the traces causing
sudden fluctuations as current spikes come and go (common problem with
digital circuits whenever an output change state)

--Brendan

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