Circuit for piezoelectric transducer (CB8968E)

This buzzer trigger can be used for small alarms. We find it in an 80’s American documentation. The supply can be done with voltages from 3 to 18 V.

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Proximity Relay (CB25343E)
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Pulse Width Modulator (CB5364E)
This circuit is from an old operational amplifiers manual. However, the setting applies to modern...
Sine to square converter CA3140 (CB24971E)
Using an operational amplifier, the figure shows how to convert the waveform to low frequency...