We found this circuit in a 1998 documentation. It tests common household appliances to see if they are shorted by lighting an incandescent lamp.
This is one of many timer settings with the 555 found on this site. This is the traditional...
This circuit is from the American magazine that no longer exists Science & Electronics,...
This is the basic configuration of many LM339 manuals, as a comparator with hysteresis. The font...