This circuit was found in a 1970 IEEE publication. The circuit functions as a voltage controlled variable resistor and can be used with audio signals. Transistors admit current equivalents.
This general-purpose transistor amplifier stage was found in the November 1993 issue of...
This circuit was found in the July 1992 issue of Radio Electronics magazine. The circuit is based...
Found in an Electronics Now from the 90s, this application uses an integrated circuit from the...