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 ouput push-pull stage using bipolar transistors was found in a publication of the year 1968....
LEDs are diodes and can be tested with a simple configuration that allows the display of its...
This circuit can drive a loudspeaker with near 1 W of Power from 6 to 9 V supplies. The circuit...