Bidirectional buffer (CB9317E)

This circuit was obtained in a 90s Electronic Design. The circuit uses components from that time.

Bilateral current source (CB20359E)
Settings like this can be found in this section and on this website, but from different sources of...
Interface shield (CB7260E)
This circuit with TTL output was found in a 1968 EEE. The transistor can be of general use. The...
Light intensity to frequency converter (CB9609E)
Found in a 1980s manufacturer documentation, this circuit can be used as an optical shield. The...