Centigrade thermometer (CB21279E)

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

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Increasing zener voltage with LED (CB22134E)
In the figure we have the way to use an LED to increase the voltage of a zener. The increase...
Ultra low active cycle (CB9078E)
This astable multivibrator has an active cycle of 30,000: 1. We found it in a 1970 EEE. The...
Precision Ramp Generator (CB10042E)
We found this circuit in a documentation from the 70s. Semiconductors are from the era and can be...