This circuit was found in a 1945 publication. The circuit was stated to be part of a walk talkie. Note that, as it is a portable assembly, it was powered by batteries. The jack was for microphone insertion.
This 9-pixel circuit has been implemented with 9 LDRs and can be coupled to a processing system for...
We found this circuit in Harris' 90s documentation. The circuit applies to modern operational...
This circuit was found in an English publication in 1986, but it can still be implemented by...