2008/8/30 Jinx : > I'm making up a test-bench version of a frequency switch for a wind > turbine. The final implementation will be a simplified version of this > Any ideas, links to similar projects etc, welcome and appreciated Perhaps you're using the wrong tool for the job. A Frequency to Voltage convertor like LM2917 is designed for this type of application. The 10 bit ADC would give you good enough resolution to provide an accurate display of frequency, -- Jon Baker -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist