RAZOR SHARP CW FILTER


Posted on Feb 6, 2014

The circuit consists of four stages of active bandpass ftltering provided by two type A747 integrated-circuit dual op amps and includes a simple threshold detector (diodes D1 and D2) between stages 2 and 3 to reduce low-level background noise. Each of the four filter stages acts as a narrow bandpass ftlter with an audio bandpass centered at 750 H


RAZOR SHARP CW FILTER
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z. The actual measured 3-dB bandwidth is only 80 Hz wide.




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