This circuit generates a two-tone effect very much alike the cuckoo song. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. Agreeable, very close ...
IT IS the epitome of spring’s awakening but this year the sound of the cuckoo has become increasingly rare. The bird has declined by two thirds in twenty years. Reasons for its scarcity are unclear ...
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