| 摘要 |
PURPOSE:To transmit a signal and simultaneously a switching signal with a simple circuit configuration by insulating the primary side and the secondary side by a photocoupler, and providing a switch circuit for turning OFF or saturating the photocoupler at the primary side. CONSTITUTION:An input signal is input through a capacitor C11 to the base of a transistor Q11. The collector of the transistor Q11 is connected through a light emitting element D11 of the primary side of a photocoupler PC1 with a power source, the emitter of a photoreceptor Q12 at the secondary side of the photocoupler PC1 is earthed, and the collector is connected through a resistor R14 with the power source. Further, a transistor Q14 which is turned ON or OFF by a switch signal is connected with the base of the transistor Q11. An output signal is led from the emitter of the transistor Q13 connected with the secondary side of the photocoupler PC1, and a switch signal is led from the collector of the transistor Q15. |
