Water Level Sensor (CB6557E)

This grid-isolated sensor was proposed by General Electric in 1966 documentation. The circuit currently uses common components.

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Oscillator for Square Signals (CB19014E)
This circuit, found in documentation from the 1980s, uses an operational amplifier from that time....
Wien Bridge Oscillator (CB9039E)
This low frequency sinusoidal oscillator was obtained in documentation from the 1970s. Operational...
Remote Vibration Transducer Amplifier (CB4951E)
This circuit was found in a 1980s documentation. It is intended for remote vibration monitoring...