Musical doorbell (CB9210E)

This musical doorbell was found in a Popular Electronics from the 90s. The U4 melody generator integrated circuit is uncommon today.

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Stereo Equalizer (CB16706E)
In the original 1992 application, this passive circuit was intended for use in the car. At that...
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This 1995 circuit uses an audio amplifier that is no longer common today. However, other...
RIAA Equalization Amplifier (CB4952E)
This circuit is from an 80's documentation. The integrated circuit is from the time and the...