The figure above shows the circuit schematic of the receiver. The three thermistors RT1/RT2 and RT3 are placed inside the quilt used by the baby. If the baby is not kicked, the temperature of the thermistor is higher and its resistance is also Smaller, the VT1 base bias is smaller, does not cause the oscillator to oscillate, and the speaker does not sound. Transistors VT1 and VT2 form an audio oscillator. If the quilt is kicked, the resistance of the three RTs (or two of them, one) increases, and the VT1 base bias increases, causing the oscillator to start to sound an alarm. Regardless of whether the baby is kicked or not, when the baby is peeing, the resistance between A and B in the figure will change from almost infinity to 50KΩ, and the oscillator will also start to vibrate, causing the speaker to make a sound.
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