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unique sound generating circuit with CD4040,CD4069

2014-11-11 12:17  
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unique sound generating circuit with CD4040,CD4069
The sound generating circuit can produce the sound which is similar to bird singing, car sirens and spacecraft sound,and it is a good toy for children.The circuit is shown in the picture.Core part is formed by a controlled oscillator composed of the gate circuit,which can change the oscillator frequency by adjusting the control voltage of the controlled oscillator, resulting in sending out a variety of analog sound.