This filter is from a 1977 publication. The circuit employs three 741 or other operational amplifiers. The supply must be symmetrical and the components with (*) are low tolerance.
The filter shown in the figure, suggested by Motorola, operates at a cut-off frequency of 1 kHz,...
The purpose of this circuit based on Maxim's MAX9022 is to find faults in multiple cables. The...
This circuit is suggested by Motorola in its 1990 Linear Databook. The speaker (or headphone is 32...