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A comment on Should you fear your USB cable?. Parent comment
Apparently the resistance falls quickly at first but can take a long time to fully return to pre-trip level.
This has caused trouble in the Raspberry Pi. Users were getting odd effects when voltages didn't quite return to spec after polyfuse trip. [2]
[1] http://www.te.com/content/dam/te-com/documents/circuit-prote...
[2] http://elinux.org/Polyfuses_explained
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Apparently the resistance falls quickly at first but can take a long time to fully return to pre-trip level.
This has caused trouble in the Raspberry Pi. Users were getting odd effects when voltages didn't quite return to spec after polyfuse trip. [2]
[1] http://www.te.com/content/dam/te-com/documents/circuit-prote...
[2] http://elinux.org/Polyfuses_explained