| 摘要 |
PURPOSE:To obtain an electronic timepiece of stable accuracy in an electronic watch having two constant voltage circuits differing in the set levels of output voltages by providing a means of detecting the battery voltages of small batteries and supplying the output voltages adequately. CONSTITUTION:The voltage of a battery 1 is detected with a voltage detecting circuit 2, and when the output signal S3 of a control signal generating circuit 4 is an ''L'', switches 11, 13, 14 go on, and in the case of an ''H'', switches 12, 15, 16 go on. The 11 connects a constant voltage circuit B of batteries 1 and 5, the 12 connects a constant voltage circuit of the batteries 1 and 7, the 13 connects a 1.5V system driving circuit 9 of the circuit B of the 5, the switch 14 connects a boosting circuit 6 and a 3V system driving circuit 10, the 15 connects the circuit A of the 7 and the circuit 10, and the 16 connects a voltage dropping circuit 8 and the circuit 9. |
