Clinical thermometer (CB7244E)

For measurements between 30 and 40º C this circuit was found in the documentation of 1968. The sensor is a difficult component to obtain today.

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Digital Voltmeter (CB18102E)
We present a circuit formed by six voltage comparators. Each comparator will analyze the voltage...
Time base (CB8933E)
This circuit can generate time base signals from 5 to 1500 Hz. We find it in a documentation about old neon...
Undervoltage Switch with the CA3140 (CB12144E)
In this circuit the CA3140, an operational amplifier, is used as a comparator with the zener diode...