This is the circuit of an automotive voltage regulator from the 1970s. The circuit is entirely electromechanical based on the closing of a relay contacts according to the voltage.
This circuit is intended to trigger an alarm when the input voltage exceeds one value and to...
Considering that the speed of light is extremely great which makes us see a lightning flash...
This low impedance microphone preamp is from a 1957 Raytheon publication, using germanium...