This circuit for cars with fans was found in Silicon Chips documentation from the 90s. It is used to activate the fan when the radiator water temperature rises.
We found this circuit in a documentation from the 50's. The transistors are germanium types. The...
Suggested by a 1966 publication, this circuit applies a 60 Hz signal to a transistor to test its...
This circuit triggers a warning LED when the standing waves reach a high value. The circuit was...