Light switches in the plant room are all timer switches.
位于机房内的全部灯光开关器都装设了时间掣。
The working principle and the functions of the monostability multivibrator composed of 555 timer are introduced in the paper, and the time switches are designed.
介绍了用555定时器构成的单稳态触发器的工作原理，对其功能作了进一步探讨，在此基础上设计了一种具有实用价值的定时-非定时两用开关。
The working principle and the functions of the monostability multivibrator composed of 555 timer are introduced in the paper, and the time switches are designed.
介绍了用555定时器构成的单稳态触发器的工作原理，对其功能作了进一步探讨，在此基础上设计了一种具有实用价值的定时-非定时两用开关。
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