If I didn’t know any better, I would say that these Soviet diagrams from 50 years ago were suggestions for burglar alarms. Of course, they didn’t have to worry about burglars in the workers’ paradise, so they must have been something else. If I were able to read the text in the February 1970 issue of Юный техник, I would be able to come up with a more accurate description. But I’m guessing they’re probably designed to catch capitalist imperialist running dogs.

In any event, the two-transistor circuit at the left appears to be a solid-state relay to drive a buzzer. The other diagrams are self-explanatory, such as how to make a switch from a clothespin.