| 摘要 |
An electro-optical system includes a phototransistor having collector and emitter electrodes and adapted to receive modulated light representing data and generating current in a current flow path representative of the received light. A load is placed in the current flow path and generates a voltage due to the current flow, and means are provided for sensing the generated voltage and using that voltage in a feedback circuit to the phototransistor to maintain the collector base junction voltage of the phototransistor constant.
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