This circuit with the LM741 operational amplifier can be applied to other operational amplifiers. We found it in the September 1989 Radio Electronics magazine.
This circuit was found in a European publication from the 1980s. The operational amplifier is not...
This circuit was found in an American documentation from 1969. The circuit memorizes when a...
This shortwave preselector was found in the July 1994 issue of Radio Electronics magazine. The...