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A very simple and very effective passive CW audio filter
http://ki3u.byethost3.com/Radio-PhysicsDIR/ecomDIR/Simple_passive_CW-filter/Simple%20passive%20CW%20audio%20filter.html
audio voltage when the filter is in use. a-d.) back off on the volume. Insert the CW filter into the audio output line, keeping the AC Voltmeter connected across the line at the INPUT side of the filter. With the filter's bandwidth wide open retune the receiver for maximum loudness as indicated by the AC Voltmeter.
K4ICY's Home Brew CW Audio Filter
http://www.k4icy.com/cwfilter.htm
When an incoming CW signal is set at "zero-beat" I can then switch the output to four-stage mode using all the Op amps. If the received CW audio is clear or even piercing then the filter is working. Since this filter is extremely narrow, some "ringing" (which sounds like noise played underwater) may be produced.
Simple Lowpass CW SCAF Filter - QRPGuys
https://qrpguys.com/simple-cw-scaf-filter
The QRPGuys Simple Lowpass SCAF Filter is an adjustable lowpass audio filter for cw that can be very helpful for a variety of receivers that lack the selectivity, or receive both sidebands simultaneously to narrow the audio pass band so individual cw stations can be heard more easily. It uses the MAX7427, 5th order, low pass, elliptic switched-capacitor filter IC.
Audio CW Filter - PARA
https://www.para.org.ph/docs/CW-Audio-Filter.pdf
A audio cw filter is a way to add narrow audio filtering to the audio output of a transceiver or receiver, the audio filter is usually placed between the audio output from the transceiver phone socket and the operators headphones or speaker, using an audio cw filter also helps to reduce qrm/qrn (fig 1) An external audio cw filter is also transferable between transceivers, which is …
Audio filters for CW
https://k4lxycw.wixsite.com/blog/post/audio-filters-for-cw
Wolfwave. Peak in graph indicates that signal is tuned to sidetone frequency. Box with jacks, upper right, is the transmit bypass circuit. I admit I've had a bit of an obsession with audio filters. This is partly because I’ve worked with a variety of vintage rigs and with QRP rigs, both of which often have fairly limited filter options. But the other reason is my aging hearing: …
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