| 摘要 |
An apparatus for indicating data transfer between a personal electronic device and a host device includes a common node that connects at least one data line to the personal electronic device and at least one data line to the host device. A high impedance amplifier has an input electrically coupled to the common node and generates an amplified signal corresponding to a signal value present on the common node. A monostable circuit is responsive to the amplified signal and generates a plurality of electrical pulses when the amplified signal exhibits changes in value corresponding to a data transfer through the common node. A lamp driver circuit, that is responsive to the plurality of electrical pulses, generates pulses of light correspond to the electrical pulses. Each of the plurality of electrical pulses is of sufficient duration so that each of the pulses of light is of sufficient duration to be perceived by a human eye.
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