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Variable CW and SSB audio filter - uBitx
https://ubitx.net/2018/09/02/variable-cw-and-ssb-audio-filter/
Variable CW and SSB audio filter – uBitx September 2, 2018 by admin Variable CW and SSB audio filter Andy RW9RN has developed a wee circuit for insertion in the audio line to provide variable bandwidth control for CW and SSB. He has a video about it here. Reference Previous Single-ended relay board for existing LPFs Next SSM2167 install details
LASERBEAM-VARI digital variable audio filter module
https://radioaficion.com/news/laserbeam-vari-filter-module/
Variable Audio Filter Module Our new LASERBEAM-VARI digital variable audio filter module is the perfect addition to your project or even to your existing radio. Unlike analogue filters, digital filters provide near-perfect characteristics. Because of the way that they are implemented, they are better than analogue filters in almost every way!
DX Audio Filter Circuit - ElectroSchematics.com
https://www.electroschematics.com/dx-audio-filter/
The state variable filter is composed of the opamps A2, A3 and A4. The potentiometer adjusts the bandwidth of the filter. The potentiometer P2 adjusts the center frequency of the filter from about 200 Hz up to 2 kHz. By setting these two potentiometers correctly, it is possible to filter out a certain frequency band from the entire audio spectrum. …
Audio Filters: Designing an audio equalizer – Part 7
https://www.engineersgarage.com/audio-filters-designing-an-audio-equalizer-7-8/
An equalizer (EQ) is an audio filter that isolates certain frequency components from an audio signal, either boosting or lowering them. EQs are widely used in audio systems, including while recording or with amplifiers and mixers. They’re typically used to correct or adjust the response of the speakers, amps, microphone, or even a room’s acoustics.
eHam.net
https://www.eham.net/reviews/view-product?id=14613
The LASERBEAM-VARI digital variable audio filter module is the perfect addition to your project or even to your existing radio. Unlike analogue filters, digital filters provide near-perfect characteristics. Because of the way that they are implemented, they are better than analogue filters in almost every way!
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