| 摘要 |
PURPOSE:To supply a gate pulse stably by transducing an output current change of a 1st differential amplifier into a voltage drop change across a two-division resistor connecting to the output, transducing the voltage into a time via a capacitor so as to apply timewise correction to a sawtooth wave voltage. CONSTITUTION:When a local slide variable resistor is operated, an output current of a differential amplifier is changed and the change is transduced into a voltage drop change at a level of a midpoint between 2-division resistors 5, 8 and fed to a capacitor 7. Thus, a sawtooth wave voltage is corrected timewise via a transistor(TR) 9 and the capacitor 7 and a stable gate pulse is supplied from the differential amplifier 4 and a 2-way thyristor 13 drives stably a motor 12 without use of a large capacity of a capacitor and production of beat noise. |
