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:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Capacitance meter
    Sequential timing
    Code-Practice Oscillator Iii
    radio transmission to get the GPS data
    Circuit Diagram 6 zone alarm independent
    Whats the third wire on a piezo buzzer
    infrared motion detector
    gold detector schematic
    LM1875 Datasheet
    Enclosure for the Magnetometer v2.0
    Time to start reversing relay control circuit



    Top