Electronics Dice 4017 (CB26047E)

This circuit was found in the May 1998 issue of Electronics Now magazine. The circuit drives a set of LEDs.

Tuned Band Notch Filter LM107 (CB15472E)
An interesting and versatile filter circuit, suggested by National Semiconductor is the one shown...
Symmetrical 15 V power supply (CB8498E)
Found in na 1970 EDN this circuit has a parallel regulation providing a symmetrical output of 15 V....
Telegraph manipulator (CB7038E)
This circuit was found in an American magazine 73 for radio amateurs of the 80s. It is an...