The purpose of this circuit is to limit the noise of an audio signal. Diodes are made of germanium. The circuit is from an old American manual.
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...