| 摘要 |
PURPOSE:To reproduce a sinusoidal wave faithful to an original waveform, by giving a secondary output of a transformer to a light emitting diode, transmitting an optical signal corresponding to a positive and a negative voltage and adding a level proportional to the threshold value of a diode for eliminating high harmonic components. CONSTITUTION:A secondary output (a) between terminals 1, 2 of the transformer Tr is applied to light emitting diodes D1, D2 via a temperature cmpensating circuit 2 comprising resistors R1, R2 and a thermister Rt to light respectively the diodes D1, D2 in response to the positive and the negative voltage. This optical signal is transmitted to photodiodes D3, D4 at receiving side on optical fibers F1, F2 to convert the optical signal into an electric signal. A pulsive output is generated at load resistors R3, R4 with this signal to output a pulsive output (b) at an output load resistor R7 of an operational amplifier IC1 to be supplied to operational amplifiers IC2, IC4 to output respective rectangular wave signals C, C'. The signals C, C' are added to the output (b) proportional to a threshold voltage inherent to the diodes D1, D2, the high harmonic components are eliminated and a sinusoidal wave faithful to the original waveform is outputted. |
