Højohmsmodstand Potentiometer Carbon powder

Bang & Olufsen (B&O); Struer

Data
Forum
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Collections

  • Year
  • 1929–1937 ?
  • Category
  • Radio part (not a module) 
  • Radiomuseum.org ID
  • 274268
    • Brand: B&O

 Technical Specifications

  • Wave bands
  • - without
  • Power type and voltage
  • No Power needed
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Højohmsmodstand Potentiometer [Carbon powder] - Bang & Olufsen B&O; Struer
  • Shape
  • Miscellaneous shapes - described under notes.
  • Dimensions (WHD)
  • 33 x 33 x 19 mm / 1.3 x 1.3 x 0.7 inch
  • Notes

  • High resistivity potentiometer.

    The variation of resistivity is based on the compression of carbon powder inside the metal box, similar to the functioning of a carbon microphone.

    Variable resistor based on the principle of carbon powder compression. A strong metal case (steel, brass) is filled with carbon powder and a piston is forced against the powder by turning a threaded screw. One contact is given by the metal case while the other contact is a smaller, from the case insulated, metal plate opposite to the piston and in contact with the carbon powder. A feed through is provided by a screw for electrical connection. The resistance range, depending on pressure, is typically from 5 kΩ to 1 MΩ.

  • Net weight (2.2 lb = 1 kg)
  • 0.037 kg / 0 lb 1.3 oz (0.081 lb)
  • Price in first year of sale
  • 3.50 Kr
  • Mentioned in
  • Jan Thogersen - The Bang and Olufsen Collection 1925 -1949 )
  • Literature/Schematics (1)
  • - - Manufacturers Literature (Advert. 1929)
  • Author
  • Model page created by Albert Walenta. See "Data change" for further contributors.

 Collections | Museums | Literature

Collections

The model Højohmsmodstand is part of the collections of the following members.

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