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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