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.
We found this circuit in the April 1982 Radio Electronics magazine. It contains a good power stage...
The circuit shown in the figure can be designed with more modern operational amplifiers, as it is...
In the figure we show how it is possible to use the 4013 integrated circuit in the monostable...