| 摘要 |
PURPOSE:To alarm the life of a battery accurately by generating auxiliary drive pulses by a fixed frequency when a motor does not run by a normal drive pulse. CONSTITUTION:When it is detected with a detection circuit 7 that a pulse motor 6 does not rotate, auxiliary pulses are generated 4. After that, normal drive pulses with a larger width are generated from a generation circuit 3. When the battery consumes so much that the motor fails to be driven even though the normal drive pulse width reaches its maximum, auxiliary drive pulses are generated continuously by a fixed frequency, output of a counter 10 drives an alarm 11. |
