Centigrade thermometer (CB21279E)

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

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Telephone Line Protector (CB10667E)
This circuit came out in a publication called Electronics Handbook of 1993. The circuit shows how...
Crystal CMOS Oscillator (CB3883E)
This oscillator can generate signals up to a few megahertz depending on the crystal used. Actually...
Optical Shield TTL - II (CB1324E)
The drive levels of this shield are opposite to the previous one. The photo-transistor can be of...