Freeze Alarm (CB14454E)

The circuit of a 1968 publication can be implemented with more modern transistors such as BC548 for NPN and BC558 for PNP.

Farm Protection System (CB16952E)
According to the 1990 documentation in which we found this circuit, the chickens must be fed at...
OR gate LM3900 (CB14200E)
We found this setting in the National Semiconductor Linear Applications Handbook. The base is an...
Ring counter (CB8915E)
This configuration found in GE documentation from the 90s, can also be seen elsewhere in this...