http://tonnesoftware.com/elsie.html

On 3/20/07, alan smith <micro_eng2@yahoo.com> wrote:
> Looking for specifics on designing an AC harmonic filter....thinking this is just a bandpass filter with a highQ ?  Want it to be able to pass 45Hz to 90Hz...or even make it somewhat adjustable.  The AC is being fed into an optocoupler to measure the frequency of an alternator.
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