| 摘要 |
PURPOSE:To enable a plastic system optical fiber to be applied, by providing a TTL gate circuit receiving an input and a transistor (TR) to which the output of the gate circuit is connected, in a transmission module of a visual digital link. CONSTITUTION:In the transmission module of the visual light digital link having DC 1p Mb/s of transmission speed and a TTL level of the input signal level, the TTL gate circuit 12 and the TR13 to the base of which the output of the circuit 12 is given are provided, a current limiting resistor 14 and a visual light emitting diode are connected in series between the collector of the TR13 and a power supply VCC and the emitter is grounded. Thus, the driving current of the diode 11 is taken larger and the selection of the current value is performed. |
