Fast adder 1 (CB7055E)

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

Transistor Power Amplifier (CB1400E)
Although not using transformers, this amplifier may have difficulty mounting if the original...
Base Triggered Flip Flop (CB996E)
This flip-flop or bistable multivibrator is triggered by a signal applied to the base of the...
Positive Voltage Regulator (CB5461E)
The integrated circuit used in this regulator is not very common today. The circuit is from old...