Fast adder 1 (CB7055E)

We found this circuit in an Electronic Engineering from the 90s. It applies to any logical family.

Optical Shield TTL - II (CB1324E)
The drive levels of this shield are opposite to the previous one. The photo-transistor can be of...
12 V Power Supply with Negative Regulator (CB1170E)
This circuit was found in a Radio Electronics of July 1984. It consists of the traditional 1 A...
Neon flasher (CB9784E)
This flasher or neon signal powered by batteries was found in old documentation. The transformer must...