| 摘要 |
PURPOSE:To make the center of the pulsation of the 2nd pseudo sine-wave voltage invariably constant by separating only a sine-wave component from the 1st pseudo sine-wave voltage, superposing this sine-wave component upon a DC component, and generating the 2nd pseudo sine-wave voltage. CONSTITUTION:As a rotary disk 14 rotates, light incident to a phototransistor 7 varies in the quantity and the internal resistance of the phototransistor 7 varies to generate the 1st pseudo sine-wave voltage V2 at the series connection point between a resistance 12 and the phototransistor 7. A capacitor 21 is connected to separate a sine-wave component from the 1st pseudo sine-wave voltage V2, and the separated sine-wave component is superposed upon a DC voltage at the series connection point between voltage dividing resistances 17 and 18, generating the 2nd pseudo sine-wave voltage V5. |
