VARIABLE RESISTORS NAMELY

Brand Owner Address Description
SPECTROL VISHAY SPRAGUE, INC. 2813 West Road Bennington VT 05201 [ VARIABLE RESISTORS-NAMELY, ] PRECISION POTENTIOMETERS, TRIMMING POTENTIOMETERS AND [ SECTOR POTENTIOMETERS; ROTARY SWITCHES; ] TURNS COUNTING DIALS [ ; AND COMBINATIONS OF THE FOREGOING ];
 

Where the owner name is not linked, that owner no longer owns the brand

    
Technical Examples
  1. An absorptive temperature-variable microwave attenuator is produced using a first plurality of shunt resistors separated by quarter-wave transmission lines connected by a series resistor with a second plurality of shunt resistors separated by quarter-wave transmission lines. At least one or more of the resistors are temperature-variable resistors. The temperature coefficients of the temperature-variable resistors are selected so that the attenuator changes at a controlled rate with changes in temperature while attenuator remains relatively matched to the transmission line. In one embodiment, the resistors are thick-film resistors and a variety of temperature coefficients can be created for each resistor by properly selecting and mixing different inks when forming the thick film resistors. Furthermore, attenuators can be created having either a negative temperature coefficient of attenuation or a positive temperature coefficient of attenuation.