High impedance stage (CB20564E)

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

Ring counter (CB6605E)
Suggested by General Electric in a 1967 publication, this circuit uses the D13T1, an uncommon SCR...
Gain 10 Amplifier with the L161 (CB4910E)
This circuit is from the 80's component manual itself, but can be applied to more modern...
1200M ohm probe (CB6452E)
Suggested by a 1965 Electronic Design, this circuit was originally proposed for oscilloscope...