OT: What's in a USB cable?
jsteller at spottydog.us
Sun Jan 6 09:39:49 CST 2013
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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