As shown in the figure, the rice cooker rice is well informed. The circuit consists of a 10-minute delay circuit, a 3V buck power supply, a music integrated circuit CIC2851AE, and a piezoelectric ceramic sheet HTD. The 10-minute delay circuit consists of BG1, R3, C3, and so on. The 3V buck power supply consists of C1, R1, R2, D, DW, and C2. The two points A and B in the circuit are connected to the control switch of the rice cooker.
When the rice cooker is working normally, the voltage across A and B is 0, and the whole circuit does not work. When the rice cooker is boiled, the main control switch trips. At this time, the AC voltage is obtained at both ends of A and B, and the circuit starts to work. After the delay of the buck power supply and delay circuit for 10 minutes, the music integrated circuit CIC2851AE starts to work, and the output audio signal is amplified by BG4 to drive the HTD to make a sound. So inform the owner that the rice is cooked and unplug the power outlet.
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