600Hz One Transistor CW Audio Filter - Active CW Audio Bandpass Filter

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As simple as you can get. One transistor active audio bandpass filter for CW. Use it as it is, or you can try to experiment and use two filters together for a much sharper result. I like it as it is, so I will use the schematic from the video. The center frequency is about 600Hz. I will return later on with another video and the final schematic I decided on, together with a PCB board design. First I would like to take my time and also test it with more audio amplifiers.

In the video describing the schematic, I meant NPN transistor not PNP. Also in the schematic the top capacitor is connected wrong. It should connect to the junction between the 10K and 220K resistors, not to the 220K resistor as it is in the schematic from the video. This is how you draw when you are filming videos at 6AM ( ha ). Sorry for the mistake, I will correct it in the blog article.

Thanks Ian and Hendrik for letting me now.

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