New alarm circuit for toys

Circuit working principle: The left part of the dotted line is the original tumbler circuit, and the right part is the new
circuit. First, make a hole in the lower part of the tumbler shell, install the single-pole multi-throw switch , then disconnect the power supply
circuit to HL685 at S, and then connect it to the single- pole multi-throw transfer switch K4 as shown in the figure. If you want to laugh out loud, just shake the tumbler shell. The S trigger switch is composed of a steel ball and a galvanized iron cover. When the steel ball collides with the cover, S is turned on, triggering the HL685 voice chip to emit a "haha" laugh .