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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.
The first IC
determines how fast the changeover from one frequency to the other
takes place and second IC determines the tone of the final output.
By varying the VR1, the changeover rate can be adjusted. By
varying VR2 the tone can be adjusted.
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