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Carbon Resistor Noise

August 19th Fact-of-the-Day

Resistors composed of carbon granules generate far more noise than thermal agitation noise when current flows through them. The higher noise level results from fluctuations in contract resistances between adjacent carbon granules. Noise voltage due to that cause is proportional to the amount of current flowing whereas thermal agitation noise does not depend on current. ©2004 Martek International All rights reserved.


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