Berlin microphone
The Berlin microphone is a microphone named after its inventor Emil Berliner .
functionality
With the Berlin microphone, a solid carbon contact g is screwed into the middle of a membrane m surrounded by a rubber ring, while a second carbon piece c hangs like a pendulum on an arm a that can be rotated between two screw tips and presses on the carbon piece g with its own weight.
The membrane is only clamped on the upper side against the cover D of the housing, while it is dampened in the middle by a spring f coated with rubber when the cover is closed.
To achieve a securely conductive connection between the arm a and the carbon contact suspended in the hinge, a light wire spiral is clamped on the arm on the one hand and the fastening screw of the carbon piece on the other. The operation of the device is the same as that of the Blake microphone .
literature
- Fritz Kühne: mono, stereo and transistor microphones. 7th edition, Franzis Verlag, Munich, 1966
- Harry Dittrich, Günther Krumm: Elektro-Werkkunde Volume 5 / Professional experience for telecommunications fitters and telecommunications mechanics. 4th edition, Winklers Verlag, Darmstadt, 1971