The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 25, 1979
Filed:
May. 25, 1978
Applicant:
Inventors:
Yasuaki Watanabe, Yokohama, JP;
Yukio Okabe, Yokohama, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F / ; H03G / ;
U.S. Cl.
CPC ...
330254 ;
Abstract
Two terminals of a variable resistor are respectively connected via resistors to bases of two transistors which constitute an input stage of a differential amplifier while the movable contact of the variable resistor is fed with a predetermined voltage. Either the resistance of the variable resistor with respect to the resistances of fixed resistors connected to the bases or the ratio between the fixed resistors is so selected that the variation of the maximum resistance of the variable resistor does not influence the relationship between the position of the movable contact and the gain of the differential amplifier.