Working with the previous circuits, this circuit resets after 1 second. The circuit is from Radio Electronics magazine, August 1984. The time can be changed.
This circuit was found in an English documentation from 1989. The transistors support...
This relay driver or relay shield for relays up to 100 mA can operate with voltages from 9 to 12 V...
With this circuit it is possible to fire an SCR from the light that falls on a phototransistor. The circuit...