Electronics Infoline Web

Filter Choke Analyzer

more than just an inductance meter

http://www.angelfire.com/electronic/funwithtubes/Filter_Choke_Analyzer.html

Filter Circuit Board for Earthworm Seismic Data Acquisition System

A seismic network data acquisition and processing system developed by the U. S. Geological Survey, Earthquake Hazards Team (USGS, EHZ) and Dr.Carl Johnson.

http://geopubs.wr.usgs.gov/open-file/of00-379/of00-379.pdf

Filter Design Guide

http://www.freqdev.com/guide/fullguide.html

Interactive Filter Design

Read this article on lowpass Butterworth filter design and change the values of the example to your own design specs. The example changes to show your design. By the time you finish reading the article, you have also designed your filter - complete with a

http://www.bessernet.com/articles/lowpfilt/bwfiltstep00.html

Interactive LC Filter Design

By Tony Fisher. Designs several types of LC filters, including low-pass, bandpass, high-pass, and band-stop, in Butterworth and Chebychev forms. Includes frequency and phase plots.

http://www-users.cs.york.ac.uk/~fisher/lcfilter/

LC High-Pass Filters

Butterworth

http://www.electronics-tutorials.com/filters/high-pass-filters.htm