Energy efficiency is important for sustainability. However, efficiency cannot rely on human being as human is forgetful. Many energy applications live on only at night. This paper extracted design and analysis of LDR-controlled device based on MXD-122 existing product. Circuits design contains power supply, sensors, comparator and switching device. As analysis performed, it is revealed that system works only for half wave output. The output current is limited by the maximum current of IDSS. Many resistors cause dropped voltage, which means system efficiency is very low. In order to enhance system for controlling higher current device, it should be connected to contactor.
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