This circuit is from a 1965 Motorola documentation. The transistors are of the time as is the uninformed magnetic sensor.
This circuit was found in an English publication from 1976. It generates sequential signals in the...
This configuration appears elsewhere on this site. We found it in a Motorola manual from the 70s....
This 1968 circuit makes use of MOSFETs of the time. The circuit can be mounted based on modern...