We found this circuit in an old documentation. Its purpose is to turn on warning lights when the vehicle in a garage touches or passes a sensing bar preventing it from hitting the wall.
This circuit for a 455 kHz ceramic filter was found in the October 1952 Radio Electronics...
This circuit is from 1971 documentation. It generates a ramp given by the input signal. The FET...
This circuit is intended to provide a standard signal for oscilloscope calibration. We found it in...