High impedance stage (CB20564E)

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

Shutdown for exhausted battery (CB8387S)
When the 24 V battery voltage drops below 18 V, this circuit cuts off its discharge. The circuit...
Source for Electrolytic Recovery (CB12857E)
High voltage electrolytic capacitors can be recovered by applying high voltage to their terminals. This...
High-speed optocoupler (CB12759E)
This shield circuit is suggested by Motorola, using a 4N26 type coupler and an MC1733 type...