OT: What's in a USB cable?
mo at ccr.org
Sun Jan 6 14:10:31 CST 2013
A most impressive catch!
I don't remember ever hearing "triboelectric effect" outside a history
discussion of early experiments with static electricity. but that makes
complete sense now that you point it out.
On 1/6/13 10:39 AM, John Teller wrote:
> USB cable by itself is a nice low-capacitance shielded cable - it's
> ideal for audio and low-signal use. However, like Mike said, that
> doesn't prevent it from picking up stray signals when one end is left
> unconnected. Despite the shielding, the cable is subject to the
> triboelectric effect and can actually produce enough voltage to drive
> the USB receiver. You can see this if you connect one of the twisted
> pairs to the input of a scope and then flex the cable.
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