Can be used as a shield, this old American documentation circuit offers digitally selected attenuation values from 1 to 0.0001. The component used is uncommon today.
This circuit from a 1970s General Electric publication applies to motors of the series winding type....
This microphone preamplifier with output intensity adjustment is suitable for modulating...
This circuit is from a project published in the March 1996 Electronics Now magazine. The author used...