Rice cooker rice cooker alarm circuit

The working principle of the rice cooker rice cooker alarm circuit: When the rice cooker is working normally, the voltage across terminals A and B is 0, and the entire circuit does not work. When the water in the rice cooker is boiled dry, the main control switch trips. At this time, AC voltage is obtained at both terminals A and B, and the circuit starts to work. After a 10-minute delay by the step-down power supply and delay circuit, the music integrated circuit CIC2851AE starts to work. The output audio signal is amplified by BG4 and drives the HTD to make sound. This notifies the host that the rice is cooked and unplugs the power socket.