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DX Audio Filter Circuit - ElectroSchematics.com
https://www.electroschematics.com/dx-audio-filter/
However, if one wants to use a wide bandwidth receiver to listen to amateur SSB and CW stations with the least amount of interference, this dx …
SSB Mic Filter - KG4JJH
http://www.kg4jjh.com/pdf/SSB%20Mic%20Filter.pdf
SSB Microphone Filter Page 2 of 5 Allen Baker, KG4JJH resulting plot of Figure 2 reveals how the filter influences the microphone signal using AC circuit analysis: J2 J1 J2 J1 J2 J1 J2 J1 J1 S4C S4A S3 GAIN S2B S2A C20 47uC11 10n R5 8.2k C9 47n C3 4.7n S4B C12 1u C6 33n R3 10k C5 15n R11 33k C18 47u R4 8.2k C2 1n R6 8.2k R7 12k C7 47n +-+ U1 ...
Tunable SSB/CW Audio Filter
http://www.radiomanual.info/schemi/ACC_audio/MFJ-751B_user.pdf
1. The filter requires audio from the external speaker or headphones output of the receiver or scanner. Apply the audio signal to the INPUT jack on the back of the unit. The INPUT jack is a RCA phono jack, which requires an RCA phono plug. The center pin of the RCA phono is positive, while the outer shell is ground. 2.
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. 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.
Simple SSB - N6QW
https://www.n6qw.com/Simple_SSB.html
The field coil of this relay is energized through the the PTT circuit. Don't forget the "snubber" diode on the field coil. Now the second DPDT relay on the right side of the Crystal Filter switches the IF connection of the second ADE-1 bewteen the input of the Audio Amp Board to the output of the Microphone Amp Board.
The Magical Audio Filter - N5DUX
http://www.n5dux.com/ham/files/pdf/The%20Magical%20Audio%20Filter.pdf
The Magica Audio Fil A variable-frequency notch filter plus a peaking circuit will do wonders for your reception. And this project will almost build itself. A udio filtering is a well- known process for improving receiver selectiv- ity and many articles have FO = I 27 ~4fi ALL RESISTORS 0 I% Fig. 1. Original circuit. been written on the subject.
How to Build Audio Filter Circuits - Circuit Basics
https://www.circuitbasics.com/audio-filters/
We can do this by connecting a low pass filter to the output of the amplifier. Here is the schematic for a 20kHz low pass filter: Figure 2. Low pass filter. The gain is set by resistors R3 and R4. With R3 at 27k and R4 at 47k, the gain (A) is: A = (R3 + R4) / …
G4AON SMD Audio Filter - QSL.net
https://www.qsl.net/g4aon/g4aon_cwf/
A peak audio filter centered around 750 Hz is commonly added to many home built receivers and transceivers. My Universal Receiver only had a low pass audio filter, so I added a peak filter for CW. Not having room to fit a second board, I designed a board using surface mount components to fit in place of the existing pre-amp/low pass filter board.
CW audio filter circuits | QRZ Forums
https://forums.qrz.com/index.php?threads/cw-audio-filter-circuits.420146/
It was an interesting choice, with 5 bands SSB and CW for less money than any modern multiband QRP kit. Of course, it's 40 years old, so it may need some TLC. Also, reading online about these, they lack a narrow CW filter, having only a 2.5 kHz wide crystal IF filter. Since I won't be building a radio, I am interested in narrow audio filters ...
K4ICY's Home Brew CW Audio Filter
http://www.k4icy.com/cwfilter.htm
This little accessory will add the much needed narrow band filtering to your audio radio's output. The circuit used is an active RC driven filter using Op amps and is pre-constructed for a set frequency range. The circuit was inspired from the ARRL Extra Class study manual's (Volume 8) pages on active filters.
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