Whistle responder.. Help!!

Discussion in 'The Projects Forum' started by krajendren, Mar 2, 2013.

  1. krajendren

    Thread Starter New Member

    Dec 20, 2012
    1
    0
    Hi,
    I thought of modifying a simple whistle responder circuit which i found on internet.
    The circuit diagram and description of circuit is in the link given below

    http://www.hobby-circuits.com/circuits/sensor/sound-sensor/447/whistle-responder




    Is this circuit diagram reliable?

    I want to design a bandpass filter using IC CD 4049 with center frequency 22kHz. if so what will be the values of R5,R6,C2,C3?

    What is the function of diodes D1 and D2?

    Thanks in advance
    Krajendren
     
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