Balance and Audibility Amplifier (CB6037E)

This circuit is from an old Signetics documentation. It can be implemented with modern operational amplifiers. The power supply must be symmetrical.

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Dial monitor (CB5999E)
We found this circuit in an American 1980s documentation. The circuit uses a piezoelectric transducer...
Simple Vibration Alarm (CB15739E)
A ring and pendulum of stripped wires form the sensor for this alarm. Once triggered, to reset, you...
Second Order High Pass Active Filter MC34071 (CB15295E)
Other operational amplifiers in the series, such as the MC34072, MC34074, MC35071, MC35072,...