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 circuit with a double-gate MOS transistor was found in a Popular Electronics from the 90's....
November 2016 - Mouser Electronics already has in stock Diodes Incorporated LM2903 Differential...
This turntable filter was found on an 80's Elektor. The circuit makes use of operational features...