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 a 1987 publication. A 4017 sequentially counts time in steps set by...
Found in 1967 General Electric documentation this circuit appears elsewhere in this section. SCRs are...
Found in an Electronic Design of 1964 this circuit has a control for the frequency and another for the...