Logical optical driver (CB7300E)

We found this circuit in a Motorola documentation from 1968. Phototransistors are common and bipolar general purpose.

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Voice Suppressor (CB4751E)
This interesting circuit found in a European publication from the 1990s eliminates the voice that...
Overvoltage Protection Circuit (CB6076E)
This simple circuit that interrupts the supply of a 12 V load in the event of an overvoltage was found in...
Micro Radio (CB16424E)
The radio presented was found in a 1980 documentation. It consists of 3 stages: the tuning circuit...