This circuit generates signals in four frequency bands with the threshold values indicated in the diagram. The circuit was found in the March 1996 issue of Electronics Now magazine.
This circuit was used to regulate the speed of small DC motors of cassette recorders. However, if the...
This excellent 30 W tube amplifier appeared in the April 1963 Radio Electronics magazine that...
This circuit was found in a 1980s documentation. It shows how to obtain a bistable with the 555 by...