The circuit is from the 1994 National Semiconductor Linear Applications Handbook but can be implemented with more modern operational amplifiers. The power supply must be symmetrical.
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...