Howdy,

The 50 MHZ Frequency Counter using PICs has been available as a kit for several
years.  Please see the following URL:

http://www.infinet.com/~dhoehnen/weeder/wtcnt-k.htm


This circuit was described in Popular Electronics several years ago.
(Nov.Ê1994,ÊÊÊCover Story - pg.33
Build a 50-MHz Frequency Counter by Terry Weeder)  I do not remember if the
source code was presented or not.   I may have clipped out the article for my
files, if your local library does not have it.

----- Steve