Be aware of AN-542, some people say it doesn't work. http://www.piclist.com/techref/microchip/fft/picspect.htm Best regards VV "John N. Power" wrote: >AN-542 describes an FFT for the 17C42. The code should give you some ideas >for porting to another processor. >John Power Do you Yahoo!? Yahoo! Mail - More reliable, more storage, less spam -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads