| 摘要 |
PURPOSE:To prevent malfunction even if the voltage of a power source drops by providing a voltage detecting circuit which detects the power source dropping, and discharging a capacitor by turning on a switching circuit when the power voltage drops down to a prescribed value. CONSTITUTION:A voltage detecting circuit 108 consists of resistances 110 and 111 which divide a power voltage, a transistor (TR) 112, and a resistance 113 connected to its collector and when the power voltage drops down to a limit value, the TR112 turns off while a TR109 turns on. A rewinding switch S6 is used to rewind a photographic film in its middle, and when this switch S6 is turned on, a reversing relay 101 is energized. Then, the relay 101 turns on by comparators 98 and 106 later, so reversing is performed continuously even when the switch S6 is released. |
