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.
The components of this filter are calculated using conventional formulas (see mathematics section of...
We found this circuit in the Radio Electronics magazine of November 1952. The circuit can be used...
This circuit is from a 1976 amateur radio manual. The transistor can be the BD136 and the...