Hi, Hank

Tenaja perfectly told what I was thinking to ... except it exists a CMOS version of the 567 ... much less consuming.

now, if you measure a nice filtered sinewave ... without distortion. you must have calculated a very, very, very nice filter ... ( I'm not talking about harmonics, but other very close frequencies that can be mixed with ...).


using the comparator section to create an interrupt , or better the CCP capture feature ... will give you the info with less than a cycle delay ...

You call that " fun " ... small gambler you are !!!

Alain