Introduction was made to the composition and working principle of a power-off time delay relay which adopts CMOS digital circuit, digital dial disc for switch setting and without auxiliary power.

介绍了一种采用CMOS数字电路、数字拨盘开关整定、无辅助电源的断电延时继电器的组成及工作原理。

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Switch frequency can finish through the easy operation, the setting still can be kept after power shot down.

开关频率可以通过简单的操作来完成，在关闭电源后仍然保持设置。

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