This circuit detects changes in magnetic flux in a coil as an external magnetic field moves. The circuit is from Electronics Now magazine, October 1996.
In the figure we have the typical circuit of a Baxandall tone control applied to an operational...
This circuit makes use of older operational amplifiers, but can be designed on the basis of modern...
This circuit that can be assembled in an “aspirin box” was found in the Radio Electronics magazine of...