As shown in the figure, the power socket includes a step-down rectifier circuit, a 555 one-shot trigger circuit, and a voice-activated electronic switch. K1 is a function switch. Adjust RP1 to get preset timing within 180 minutes. K2 is a reset switch. With this function, the fan and electric heater can be turned on or off periodically. When the K1 is set to voice control, the timing is released, and the power-on/off control of the power supply can be performed by using a high-five or whistle at a distance of 3 meters.
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