This circuit was found in an Electronics World of 1968, making use of components of the time, not common today. The power supply is not provided.
As part of a larger project, we found this modulation meter in the August 1994 Electronics Now...
This circuit was found in an 80's Electronic Engineering. The circuit uses operatives of the time...
This circuit is an improvement of the previous one, with the use of two transistors produces a...