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Active and passive Filters from Digital to AF to RF

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Chebyshev / Butterworth filters

Chebyshev / Butterworth filters

http://www.qsl.net/kp4md/filter.htm

Self-tune filter

Self-tune filter

http://w1.859.telia.com/~u85920178/use/filt2.htm

Voltage Controlled State Variable Filter 12db/Oct

Voltage Controlled State Variable Filter 12db/Oct

http://www.musicfromouterspace.com/analogsynth/statevariablefilter.html

Kalman Filters

Kalman Filters

Has useful examples.

http://ourworld.compuserve.com/homepages/PDJoseph/kalman.htm

LC Filters

LC Filters

This is a step by step, easy to follow and duplicate electronic tutorial on the design of LC Filters for your electronic project, ranging from the quite simple to the very complex, to incorporate into your next radio design.

http://my.integritynet.com.au/purdic/lcfilters.htm

Galaxy Noise Filter

Galaxy Noise Filter

http://cbworldinformer.com/200107/dx_2547_nf_schematic_clsup.htm

Pi Section Coupler

Pi Section Coupler

http://www.mindspring.com/~brucec/coupler.htm

Dual Voltage Controlled Filter

Dual Voltage Controlled Filter

with Modulator

http://www.paia.com/9730sch.gif


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