Sound and light dual control energy saving switch circuit schematic

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This circuit introduces an acoustic and optical dual-control energy-saving switch. During the daytime, the fiber is strong, and the photosensitive tube D is light-conducted. At this time, with or without sound triggering, the IC's 1 pin is low, via c, d, e. After the action of f, the 8 pin is low level, the thyristor is cut off, the bulb is not bright; at night, the photosensitive tube D is high impedance, and the level comparator exits the forced reset state. At this time, if the sound triggers HTD, after the amplification is shaped, the level of the 1 pin is higher than the threshold level, the circuit is turned over, and the C3 is charged, so that the 5 feet can maintain the high level for several tens of seconds after the sound disappears. The 8-pin is at a high level to trigger the thyristor to turn on and the bulb is lit.