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
Click here to download the full size of the above Circuit.

z. The actual measured 3-dB bandwidth is only 80 Hz wide.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Room Noise Detector
Motor speed control
Inexpensive Pulse Generator For Logic Troubleshooting
Vlf Whistler Receiver Circuit
A flash voice delay circuit
External protection signal generator by a circuit diagram TDA4866
Light emitting diode LED displays the basic structure of the driving circuit



Top