Medium impedance stage (CB20563E)

We found this circuit in an English publication from 1963. The circuit uses germanium transistors of the time.

Common collector stage (CB22226E)
This circuit employs an old germanium transistor. The circuit is from a 1950s publication and uses...
Transistor Constant Current Source (CB13410E)
We found this circuit in an English publication in 1976. The circuit is based on the use of a...
Limit comparator (CB9591E)
This is the traditional configuration for a limit comparator or window comparator, using two...