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 dual circuit was found in an 80s Siliconix documentation. The power source must be...
This version operates in the opposite way to the previous one, triggering when light falls on the...
May 2016 - It can be obtained from Mouser Electronics the new digital sensor HDC1080 precision...