This circuit is an improved version of the previous ones with the LM3914. We found it in the March 1992 issue of Radio Electronics magazine.
This interesting circuit measures the distortion of the sinusoidal voltage of the power grid. We...
The operational amplifier used in this old application is not common today, but more modern...
Used in 1950s CW receivers, this type of circuit used germanium transistors. The circuit has...