Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed is a high-frequency linear vibration massager, comprising a machine body, an audio vibrator and a driving circuit board (10). The machine body comprises a machine shell (2), a handle, a coil frame (8), a runway-shaped driving coil (7) and a wiring circuit board (9); the audio vibrator is installed in an inner cavity of the machine shell (2) and comprises a moving-iron rack (6), four magnets (5), two balancing weights (4) and a cushioning rubber mat (3); the driving circuit board (10) is arranged in an inner cavity of the handle and comprises a power supply management module, and an MCU control module, an audio playing module and an audio motor amplification driving module which are connected with the power supply management module; the MCU control module is connected with the audio playing module and the audio motor amplification driving module, and the audio playing module is connected with the audio motor amplification driving module; and the driving circuit board (10) is connected with the driving coil (7) by means of the wiring circuit board (9), and the driving circuit board (10) generates alternating current with the amplitude fluctuating up and down according to audio, so that the magnets (5) correspondingly swing according to the current waveform, and a massage effect like the rhythm of music can be achieved.
A: A functional electrical stimulation device for relieving preoperative and prenatal anxiety. The device comprises a headset, an electrical stimulation patch (6), an LED display (7), a circuit board (5), a rechargeable battery (2) and a wireless terminal (15), wherein two earphone bodies (1) are symmetrically arranged on the headset; the circuit board (5) and the rechargeable battery (2) are respectively mounted on the two earphone bodies (1), and a music control button (3) and an electrical stimulation mode and time control button (4) are further respectively installed on the two earphone bodies (1); there are two electrical stimulation patches (6), which are installed in a middle portion of the headset, and there are two LED display screens (7), which are respectively installed on the two electrical stimulation patches (6); and the circuit board (5) is provided with an audio decoding chip (8), a button control module (9), a power source switch (10), an electrical stimulation generation module (11), a wireless communication module (12), and a charging socket (13), and the wireless terminal (15) is independently arranged and is in wireless communication connection with the circuit board (5). By means of the cooperation of the functional electrical stimulation device, the patient&#39;s anxiety symptoms can be relieved physiologically and psychologically.
B: A portable nebulizer capable of automatically adjusting the nebulization rate according to pulmonary ventilation volume, comprising a housing (1), a medicine liquid box (2), a nozzle (3), a battery (4) provided in the housing (1), a circuit board (5) provided in the housing (1), a nebulizing plate (6) provided between the medicine liquid box (2) and the nozzle (3), a nebulization driving circuit separately connected to the nebulizing plate (6) and the circuit board (5) and provided between the liquid medicine box (2) and the housing (1). The circuit board (5) comprises a main control module connected to the nebulization driving circuit, a pulmonary ventilation detection module connected to the main control module, and a digital display module and a power supply module connected to the main control module; the pulmonary ventilation detection module comprises a signal amplification circuit connected to the main control module, and an internal resistance strain sensor (8) connected to the signal amplification circuit; the nozzle (3) is provided with a blowing channel (7) which is separated from the nozzle (3) and extends from outside to inside; the blowing channel (7) is communicated with the interior of the housing (1), and gas enters into the interior of the housing (1) from the blowing channel (7) to be in contact with the internal resistance strain sensor (8). The nebulizer is convenient to use and environment-friendly.
C: A moving-iron flap massage device, comprising a first housing (1). A coil support (2) and a circuit board (3) are fixed in the first housing (1); a coil is wound on the coil support (2); the coil is electrically connected to the circuit board (3); the coil support (2) is cylindrical; a magnet (4) runs into the coil support (2), and the magnet (4) can perform reciprocating sliding with respect to the coil support (2); a massage pad (5) made of flexible rubber is embedded on the first housing (1); the massage pad (5) is fixedly connected to the end of the magnet (4); the circuit board (3) is used for loading a pulse signal to the coil, so that the coil can generate an alternating magnetic field, so as to drive the magnet (4) to reciprocate by means of the alternating magnetic field and then to drive the massage pad (5) to execute a flap massage action. The massage device can implement automatic flap massage, save time and labor, and meet various massage requirements.
D: A doll circuit and a doll are provided. The doll circuit comprises a bluetooth receiving circuit, an audio amplifying circuit and a motor. The bluetooth receiving circuit includes an audio output port connected with the input port of the audio amplifying circuit. The output port of the audio amplifying circuit is connected with the motor to drive the motor. The children&#39;s interest in playing dolls would be aroused because the bluetooth receiving circuit is adopted to receive audio and drive the motor. Furthermore, the motor is isolated from a loudspeaker by an AC coupling circuit and therefore the doll circuit has the functions of driving the motor by audio and audio playing at the same time.
Answer: C