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 ...
The circuit was designed similarly with door bell units as it generates an audio of bells ringing with dual tones. MC14106 – a hex Schmitt trigger constructed with MOS P-channel and N-channel ...
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