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 interesting application in a circuit that can be used in synchronization was found in the...
The circuit presented emulates an OR gate with the LM3900, operational transconductance amplifier....
We found this circuit in the March 1992 issue of Radio Electronics magazine. The circuit uses an...