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Potentiometer
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== Failure == Ageing may cause intermittent contact between the resistive track and the wiper as it is rotated. In volume control use this causes crackling.<ref name="MIL-DBK-978-B">{{Cite book |title=MIL-HDBK-978B - NASA Parts Application Handbook |section=3.1.5.5 General characteristics of variable resistors, RJR and RTR |date=1988-03-01 |publisher=[[NASA]] |edition=B |language=en |url=https://nepp.nasa.gov/files/21522/MIL-HDBK-978B.pdf |page=3-11 (PDF 157/1224) |archive-url=https://web.archive.org/web/20240527012938/https://nepp.nasa.gov/files/21522/MIL-HDBK-978B.pdf |archive-date=2024-05-27 |url-status=live}} (Description page: [https://nepp.nasa.gov/index.cfm/21525 NASA Electronic Parts and Packaging Program]) * p3-4 (PDF 150/1224): 3.1. Resistors, general β Noise * p3-5 (PDF 151/1224): 3.1.3.2 Resistors, variable β Noise * p3-11 (PDF 157/1224): 3.1.5.5 General characteristics of variable resistors, RJR and RTR * p3-61 (PDF 207/1224): 3.9 Resistors, variable wirewound (lead screw actuated) β 3.9.7.4 Failure mechanisms </ref>
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