There are a number of PC based virtual instruments, including scopes, freq counter, function gen and DTMF fft at http://w3.pca.net/~cpclark/SBTESTEQU.html Note: the URL seems to be case sensitive?, so copy exactly. I am afraid no PICs so I will whip myself with a wet bus ticket for being such a "noise" maker on the PICLIST "signal". _____________________________ Lance Allen Technical Officer Uni of Auckland Psych Dept New Zealand www.psych.auckland.ac.nz _____________________________ -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics