Centigrade thermometer (CB21279E)

This circuit was found in National Semiconductor documentation from the 1990s. It has cold junction compensation.

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SCR Light Alarm (CB12197E)
When the light falling on the sensor is cut off, the SCR fires, powering the lamp. Remember that...
Swimming Pool Alarm (CB15051E)
When the sensor is wetted by a spray caused by someone falling into a pool or even by a wave...
Debounced Switch 7404 (CB3861E)
This traditional TTL anti-clock setting was found in a 1993 American documentation. The circuit...