High impedance stage (CB20564E)

This high input impedance amplifier stage was found in a 1963 documentation. The transistor germanium of the time.

Sequential Switch (CB9109E)
The presented circuit was found in a 90’s Electronic Engineering. The circuit is based on CMOS...
TTL Frequency Doubler (CB13737E)
This circuit that can be used as a shield doubles the frequency of a square signal. The supply must...
6-Transistor MW Radio 6TR 186 (CB18356E)
We found this Japanese commercial radio diagram of three transistors in a documentation of the...