| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical space transmission circuit suitable for changing the light strength of a light-emitting diode according to a change of an amplitude of an input signal.SOLUTION: The optical space transmission circuit is provided with an amplification unit 23 which amplifies the input signal, a transformer 25 where an output of the amplification unit 23 is inputted to the primary side, and a light emission driving unit 26 which is constituted in a way that a first resistance R1, the light-emitting diode 21, and a secondary side 25a of the transformer are connected in series between a positive power source Vcc and a negative power source Vee or a ground. The circuit is also constituted so that a voltage change according to a change of the input signal is generated at the secondary side of the transformer. |
