This old two-stage video amplifier uses integrated circuits that are not easily obtainable today. The circuit is for analog video and was found in an American 1980s documentation.
This circuit of a publication from the 70's uses a different type of power that we had already...
Short square pulses trigger this damped oscillator. The frequency of the damped oscillations is...
This circuit turns on your car's backlight when a vehicle coming from behind gets too close to it...