Differential voltage reference (CB21533E)

Found in Motorola documentation from 1967, this circuit shows how it is possible to obtain a differential reference voltage using two zener diodes.

Telephone call extension (CB10152E)
This circuit triggers a remote bell or buzzer when receiving a phone call. It is indicated for...
Tunable notch filter (CB7402E)
Found in 80's Electronic Engineering, this circuit can tune the frequency to be rejected. The power...
Delay Generator (CB5148E)
This circuit was found in an ancient American documentation. Used integrated circuits are uncommon...