Contactless ignition (CB6381E)

This circuit is from a 1965 Motorola documentation. The transistors are of the time as is the uninformed magnetic sensor.

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Water level meter (CB6959E)
This interesting capacitive water level sensor was found in Popular Electronics. The circuit can be...
Transmission line driver (CB6927E)
Using transistors at the time, this circuit was found in a 1967 Ferranti documentation. The...
Locked Micro Alarm (CB1513E)
This circuit locks when the sensors are opened. The relay can be 6 or 12 V depending on the power...