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![Audio CW-Filter NM0S/4SQRP](https://i2.wp.com/dl2sba.com/images/stories/CW_Filter_SMD/Test.jpg)
![CW audio filter for my uBitx Part 2 of 3 - YouTube](https://i.ytimg.com/vi/iAtXAJILlWI/maxresdefault.jpg)
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![Passive LC CW audio filter](https://i2.wp.com/www.qsl.net/dl4yhf/passive_lc_audio_filter/LC_Audio_Filter_Frequency_Response.png)
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