| 摘要 |
PURPOSE:To eliminate a starting switch by starting a motor by a light signal, and rotating a prescribed time motor by a timer even after the signal is erased. CONSTITUTION:When a light is emitted to a photosensor 7, the input signal of a NAND gate 9 becomes high, and the output voltage of the gate 9 becomes ''L''. Thus, the output signal of a NAND gate 10 becomes ''H'', a gate signal is applied to the gate terminal of a thyristor 14 to conduct the thyristor 14. An AC current is flowed to a diode bridge 13 by the conduction of the thyristor 14, and the motor 2 is started. Even if the light signal is erased, the motor 2 continues rotating for the delay time decided by a resistor 15 and an electrolytic condenser 16. |
