Fast adder 1 (CB7055E)

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

Voltage Monitor (CB11028E)
This circuit was obtained from a Hands-On Electronics, an American magazine from January 1987. The...
3-Transistor Commercial Transistor Radio (CB18381E)
This receiver for listening to the TR-23 phone was manufactured in Japan in the 1960s. The circuit is...
Operational 100 Hz (CB14069E)
This astable multivibrator with an operational one at the time was found in the National...