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Big Ben Sound

作者:dolphin时间:2009-08-25

This circuit produces the famous Big Ben sound. It produces the ding dong sound when switched ON.
Basically the circuit alternates between two frequencies which are adjustable. This produces the ding-dong sound.
The first IC(left) oscillates at about 1Hz. The second IC's tone is modulated by the changing voltage at the output of the first IC.


关键词: Sound

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