Medium impedance stage (CB20563E)

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

Shunt motor control (CB7940E)
This control for 1/15 HP motors with 5,000 rpm for 115 V power grid was suggested by a Motorola...
15 A Protected Regulator LM123 (CB14511E)
The circuit below is found in the manuals of several manufacturers in the LM123 series of...
Microphone Amplifier (CB20008E)
This configuration found in a Motorola documentation consists of an experimental circuit that uses...