This sound driving relay or Vox is from American 1965 documentation. The tubes are of well known types and the relay is of the high voltage sensitive type. The circuit was originally created to transform sounds as di-di-da into telegraphic tones.
This sound driving relay or Vox is from American 1965 documentation. The tubes are of well known types and the relay is of the high voltage sensitive type. The circuit was originally created to transform sounds as di-di-da into telegraphic tones.
