usefull Filter paper

[golfnut]

http://www.slideshare.net/rkattri/pr...ter-topologies

Readable run through filter types, some good references and links at the end. S

[Davor]

IMHO N-path filters are the only meaningful solution for improving metal detectors. Those are resembling low order and extreme Q filters, and thus avoid most of the problems, while simultaneously are frequency and phase punctual. I'm slowly building my detector platform around these.

[Thomas]

If you want the PDF ---> http://works.bepress.com/rkattri/37/ good stuff!