This circuit of an EDN divides the input pulse frequency by even values. The circuit is TTL and can be used as a shield for microcontrollers.
This “zero crossing detector” was found in a manual of operational amplifiers from the 1980s....
This simple circuit of a question-answer minicomputer with tray was found in a 1987 magazine. The...
This circuit was found in the May 1989 issue of Radio Electronics magazine. The circuit requires a...