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Contact effects in carbon granular microphones

  • Ragnar Holm
Chapter

Abstract

The carbon granular microphone, or transmitter, is universally used in telephone communication1. Other microphone types used for radio, loudspeakers etc. provide much higher fidelity to the audio waves, but they require costly additional amplifiers. As we shall see, the carbon transmitter itself amplifies the sound energy by a factor of several hundred. It has the great merit of low cost.

Keywords

Contact Resistance Terminal Voltage Sound Energy Space Orientation Contact Effect 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1967

Authors and Affiliations

  • Ragnar Holm
    • 1
  1. 1.St. MarysUSA

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