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Passive LC Audio Filter Project - Genebit Systems
http://www.genebitsystems.com/david/AudioFilter/
A Passive LC Audio Filter for Amateur Radio Use Revised 7-20-2014 External audio filters are sometimes used to improve the selectivity or enhance the audio quality of amateur radio receivers. These filters are usually implemented as op-amp active filters, switched-capacitor filters, DSP-based filters, or some combination thereof.
Passive LC CW audio filter - QSL.net
https://www.qsl.net/dl4yhf/passive_lc_audio_filter/passive_lc_cw_audio_filter.htm
Passive LC CW audio filter. Author: Wolfgang "Wolf" Büscher, DL4YHF. Last modified: January 2014. Description. Not much to say about this filter.. it's a passive L/C filter for aural CW reception, built from junk box partsas an 'ugly weekender build'. It helped a lot on MW in the presence of QRM, or when veryweak signals had to be copied.
What is an LC Filter? | Coilcraft
https://www.coilcraft.com/en-us/edu/series/what-is-an-lc-filter/
LC Filter Design (Rev. A) - Texas Instruments
https://www.ti.com/lit/an/slaa701a/slaa701a.pdf
Basic Knowledge of LC Filters - Industrial Devices ...
https://industrial.panasonic.com/ww/ss/technical/b4
Passive filters - Learn About Electronics
https://www.learnabout-electronics.org/ac_theory/filters81.php
Low Pass Filter Calculator - ElectronicBase
https://electronicbase.net/low-pass-filter-calculator/
LC Filters - Learn how inductive capacitive filters work
http://n5dux.com/ham/files/pdf/LC%20Filters.pdf
resonant LC filter: In Fig. 3-a, 2.2 kilohm resistor R, and the filter act together as a frequen- cy-selective attenuator that gives high attenuation at the resonant frequency f,, and lower attenuation above or be- low that resonant frequency. (The filter is a notch rejector.) In Fig. 3-b, the input signal is applied directly to the filter, and
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