Found in a February 1949 Radio Electronics magazine, this dual tube mixer has 4 inputs. Power must come from a 250V source.
This simple alarm circuit was found in the May 1990 issue of Radio Electronics magazine. The...
With this circuit, obtained from an American publication for radio amateurs in 1976, it is...
This peak indicator for stereo amplifiers uses a CA3130. The 80's circuit does not need a...