Method of reducing snap in magnetic amplifiers uses a degenerative feedback circuit consisting of a resistor and a separate winding on a magnetic core. The feedback circuit extends amplifier range by allowing it to be used at lower values of output current

Fischer, R. L. E.

Word, J. L.

English

NASA Technical Reports Server

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October 1968	 Brief 68-10388 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Method for Reducing Snap in Magnetic Amplifiers 
Snap is a phenomenon which frequently occurs in 
magnetic amplifiers and shows up as an abrupt change 
or discontinuity in the amplifier characteristics, as 
shown in the left figure. This discontinuity limits the 
range and hence the usefulness of the magnetic 
amplifier. 
A method of reducing snap in magnetic ampli-
fiers was developed which uses a degenerative feed-
back circuit consisting of a resistor and a separate 
winding on the magnetic cores. Briefly, the flux set 
up by the induced current in the degenerative feed-
back circuit is in such a direction as to oppose the 
change in flux which occurs during snap. The right 
figure illustrates the degenerative feedback circuit. 
This feedback circuit allows the magnetic amplifier 
to be used at lower values of output current, thus 
extending its range.
Note: 
Inquiries concerning this invention may be directed 
to:
Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio 44135 
Reference: B68-10388 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code 
GP, Washington, D.C. 20546. 
Source: John L. Word 
and Raymond L. E. Fischer
(LEW-10388) 
Category 01 
This document was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights.
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Method for reducing snap in magnetic amplifiers

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