The Razor-sharp CW filter Circuit Diagram consists of four stages of active bandpass filtering
provided by two type-µ integrated-circuit dual op amps and includes a
simple threshold detector (diodes Dl and D2) between stages 2 and 3 to
reduce low-level background noise. Each of the four filter stages acts
as a narrow bandpass filter with an audio bandpass centered at 750 Hz. The actual measured 3-dB bandwidth is only 80 Hz wide.
Razor-sharp CW filter Circuit Diagram
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