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 is the target for the CB18793E infrared firing gun. The circuit can be powered by voltages from 5...
The integrated circuit used in this 1986 wireless microphone is not very common today. The L1 coil...
This 1995 circuit directly controls a triac. The triac, in turn, controls the external load. Times...