CN104849571A - Smart phone audio port-based portable electromagnetic wave intensity detection device - Google Patents
Smart phone audio port-based portable electromagnetic wave intensity detection device Download PDFInfo
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Abstract
The invention discloses a smart phone audio port-based portable electromagnetic wave intensity detection device. The device includes a main control module, an earphone audio port power source conversion module, an earphone audio port communication module, a clock module and an electromagnetic wave intensity conversion module; the electromagnetic wave intensity conversion module is composed of a dipole antenna, an LC matching circuit, a five-step voltage-multiplying rectification circuit and a voltage conditioning circuit; the device is installed on a smart phone audio port; a main control chip performs A/D sampling on output signals of the electromagnetic wave intensity conversion module, and modulates electromagnetic wave intensity digital signals into analog signals; and the analog signals are transmitted to a smart phone through an earphone audio port. According to the detection device, an electromagnetic wave intensity value can be obtained through measuring the magnitude of induced voltage of the antenna in an electromagnetic field. The smart phone audio port-based portable electromagnetic wave intensity detection device is suitable for common smart phones. With the device adopted, storage, calculation and display functional units of the smart phones can be effectively utilized, and therefore, the hardware cost of the device can be reduced. The smart phone audio port-based portable electromagnetic wave intensity detection device has the advantages of small size, low cost, high universality and plug-and-play performance.
Description
Technical field
The invention belongs to Electromagnetic Wave Detection technical field, particularly relate to a kind of portable electromagnetic wave intensity detecting device based on smartphone audio frequency mouth.
Background technology
Along with China's economic is fast-developing, the progress of science and technology, wireless communication technique has been widely used in every field and has been deep into huge numbers of families, robotization, the improving constantly of the level of informatization, but also people have been brought in an environment being full of electromagnetic radiation equipment, electromagnetic radiation exponentially increases simultaneously.Up to the present, electromagnetic radiation is not also determined the impact that health produces, but has caused and pay close attention to widely, and many research topics are launched for this reason.In order to understand the amount of electromagnetic radiation in environment exactly, need to detect by instrument.
The equipment measuring amount of electromagnetic radiation at present on the market mainly comprises spectrum analyzer, Household electromagnetic radiation measuring instrument.Modern digital spectrum analyzer uses digital to analog converter to sample to input signal, calculates input signal spectrum component and shown by fast fourier transform.But its body weight is huge, price all up to several thousand dollars, and needs professional to operate.
Household electromagnetic radiation measuring instrument uses the test antenna be equipped with mutually, measures antenna certain voltage a bit responded in space.Principle of work and hardware implementing want simple relative to spectrum analyzer, cost is low.But its price is still up to hundreds of extremely thousands of Renminbi, and carry the easy problem of inconvenience, use.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of portable electromagnetic wave intensity detecting device based on smartphone audio frequency mouth is provided, be intended to solve the expensive and complicated operation of existing professional surveying instrument be difficult to universal use and family expenses surveying instrument cost still very high, and exist and portably use the strong problem of inconvenience, versatility.
The object of the invention is to be achieved through the following technical solutions: a kind of portable electromagnetic wave intensity detecting device based on smartphone audio frequency mouth, this device is made up of main control module, earpiece audio mouth power conversion module, earpiece audio port communications module, clock module and electromagnetic intensity conversion module; Wherein, earpiece audio mouth power conversion module is all connected with smartphone audio frequency mouth with earpiece audio port communications module, and main control module is connected with electromagnetic intensity conversion module with earpiece audio mouth power conversion module, earpiece audio port communications module, clock module respectively; Described earpiece audio mouth power conversion module reclaims the energy of smartphone audio frequency mouth, powers to whole device; Described audio port communication module becomes simulating signal digital signal modulated, utilizes earpiece audio mouth to send to smart mobile phone; Described clock module provides stable clock signal to main control module; Described main control module measures the DC signal produced by electromagnetic intensity conversion module, generates electromagnetic intensity data, and send to smart mobile phone by earpiece audio port communications module through A/D translation interface, completes electromagnetic intensity and detects; Described electromagnetic intensity conversion module is made up of, for electromagnetic wave is converted into DC signal to be measured dipole antenna, LC match circuit, five rank voltage doubling rectifing circuits and voltage modulate circuit.
Further, the detection frequency range of described electromagnetic intensity conversion module is 900MHz ~ 2.4GHz, and the signal of monitoring different frequency adopts corresponding antenna.
Further, described LC match circuit is made up of tunable capacitor CV1 and chip inductor L1, described five rank voltage doubling rectifing circuits are made up of electric capacity Cs1, Cs2, Cs3, Cs4, Cs5, Cp1, Cp2, Cp3, Cp4, a commutation diode D6 and 10 Schottky rf diode, and described voltage modulate circuit is made up of Chip-R R1 and R2; Wherein, tunable capacitor CV1 one end connects antenna Antenna interface after being connected with chip inductor L1 one end, and the chip inductor L1 other end is connected with one end of electric capacity Cs1, Cs2, Cs3, Cs4, Cs5 respectively; the electric capacity Cs1 other end is connected with Schottky rf diode D1-1 one end and Schottky rf diode D1-2 one end respectively, the electric capacity Cs2 other end is connected with Schottky rf diode D2-1 one end and Schottky rf diode D2-2 one end respectively, the electric capacity Cs3 other end is connected with Schottky rf diode D3-1 one end and Schottky rf diode D3-2 one end respectively, the electric capacity Cs4 other end is connected with Schottky rf diode D4-1 one end and Schottky rf diode D4-2 one end respectively, the electric capacity Cs5 other end is connected with Schottky rf diode D5-1 one end and Schottky rf diode D5-2 one end respectively, the Schottky rf diode D1-2 other end connects one end of the first rank electric capacity Cp1 after being connected with the Schottky rf diode D2-1 other end, the Schottky rf diode D2-2 other end connects one end of second-order electric capacity Cp2 after being connected with the Schottky rf diode D3-1 other end, the Schottky rf diode D3-2 other end connects one end of the 3rd rank electric capacity Cp3 after being connected with the Schottky rf diode D4-1 other end, the Schottky rf diode D4-2 other end connects one end of quadravalence electric capacity Cp4 after being connected with the Schottky rf diode D5-1 other end, the Schottky rf diode D5-2 other end is connected with commutation diode D6 one end, the commutation diode D6 other end is connected with Chip-R R1 one end, the signal that the Chip-R R1 other end exports after being connected with Chip-R R2 one end is as the measuring-signal of main control chip A/D interface, the equal ground connection of the other end of the tunable capacitor CV1 other end, the Schottky rf diode D1-1 other end, the first rank electric capacity Cp1 other end, the second-order electric capacity Cp2 other end, the 3rd rank electric capacity Cp3 other end, the quadravalence electric capacity Cp4 other end and resistance R2.
Further, described clock module comprises crystal oscillator Y1 and resistance R5, the clock input interface of the one termination main control chip U1 of described crystal oscillator Y1, connects the clock output interface of main control chip U1, the other end ground connection of resistance R5 after the other end of crystal oscillator Y1 is connected with one end of resistance R5;
Described earpiece audio mouth power conversion module by two N raceway groove metal-oxide half field effect transistor U5, two P raceway groove metal-oxide half field effect transistor U6, electric capacity C4-C8, C10, transformer T1, diode D1, resistance R8 and low-dropout regulator U3 form; The R channel of four-core earpiece audio mouth is connected with the input interface of the primary coil of transformer T1 and one end of electric capacity C8 respectively; The negative pole of diode D1 is connected with one end of one end of one end of electric capacity C5, electric capacity C6, tunable capacitor C7, one end of resistance R8, the enable interface of low-dropout regulator chip U3 and signal input interface respectively; The signal output interface of low-dropout regulator chip U3 is connected with one end of the power input interface of main control chip U1, one end of electric capacity C10 and electric capacity C4 respectively; The input interface of the same name of the secondary coil of transformer T1 respectively with the second gate pole interface, the first grid interface of two N raceway groove metal-oxide half field effect transistor U5, the second gate pole interface, the first grid interface of two P raceway groove metal-oxide half field effect transistor U6 are connected; The output interface of the same name of the secondary coil of transformer T1 respectively with the first gate pole interface, the second grid interface of two N raceway groove metal-oxide half field effect transistor U5, the first gate pole interface, the second grid interface of two P raceway groove metal-oxide half field effect transistor U6 are connected; Second source electrode interface, the first source electrode interface of two P raceway groove metal-oxide half field effect transistor U6 are connected with the positive pole of diode D1; The first source electrode interface of the other end of electric capacity C8, the output interface of transformer T1 primary coil, two N raceway groove metal-oxide half field effect transistor U5 and the second source electrode interface, the other end of electric capacity C5, the other end of electric capacity C6, the other end of tunable capacitor C7, the other end of resistance R8, the ground connection mouth of low-dropout regulator chip U3, the other end of electric capacity C10, the equal ground connection of the other end of electric capacity C4;
Described earpiece audio port communications module is by inputting submodule and output sub-module forms; Output sub-module comprises resistance R3, R9, electric capacity C2, C9; The clock B of main control chip U1 catches output interface and is connected with resistance R3 one end; The other end of resistance R3 is connected with one end of electric capacity C2 and electric capacity C9 respectively; The other end of electric capacity C9 is connected with the microphone opening of four-core earpiece audio mouth and resistance R9 one end respectively; The other end of resistance R9 and the equal ground connection of the other end of electric capacity C2; Input submodule is made up of resistance R14, R15 and electric capacity C1; The L channel of four-core earpiece audio mouth is connected with one end of electric capacity C1, and the other end of electric capacity C1 compares input interface with the clock A of one end of resistance R14, one end of resistance R15 and main control chip U1 respectively and is connected; The resistance R14 other end is connected with the power input interface of main control chip U1, resistance R15 other end ground connection; Other undeclared pin is all unsettled.
The invention has the beneficial effects as follows:
1. the ac small signal that the crest voltage that produced in antenna end by electromagnetic field of electromagnetic intensity conversion module is lower, amplified by voltage doubling rectifing circuit, voltage modulate circuit, be converted into the DC signal being easy to detection by MCU A/D interface, to reduce measuring error, realize accurately measuring;
2. electromagnetic wave strength detection device is by gathering the energy of handset audio mouth transmission, drives whole device to power, without the need to using external battery, reducing the volume size of device, being easy to carry;
3. the data of Real-time Collection are transferred to smart mobile phone by handset audio mouth by electromagnetic wave strength detection device, make use of the calculating of mobile phone, storage, networking and display module, achieve data processing, store, upload and Graphics Processing function, reduce the hardware cost of device.
Accompanying drawing explanation
Fig. 1 is the general frame figure of this portable electromagnetic wave intensity detecting device;
Fig. 2 is the hardware circuit diagram of this portable electromagnetic wave intensity detecting device;
Fig. 3 is the electromagnetic intensity conversion module circuit diagram of this portable electromagnetic wave intensity detecting device.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, a kind of portable electromagnetic wave intensity detecting device based on smartphone audio frequency mouth of the present invention, is made up of main control module, earpiece audio mouth power conversion module, earpiece audio port communications module, clock module and electromagnetic intensity conversion module; Wherein, earpiece audio mouth power conversion module is all connected with smartphone audio frequency mouth with earpiece audio port communications module, and main control module is connected with electromagnetic intensity conversion module with earpiece audio mouth power conversion module, earpiece audio port communications module, clock module respectively; Described earpiece audio mouth power conversion module reclaims the energy of smartphone audio frequency mouth, powers to whole device; Described audio port communication module becomes simulating signal digital signal modulated, utilizes earpiece audio mouth to send to smart mobile phone; Described clock module provides stable clock signal to main control module; Described main control module measures the DC signal produced by electromagnetic intensity conversion module, generates electromagnetic intensity data, and send to smart mobile phone by earpiece audio port communications module through A/D translation interface, completes electromagnetic intensity and detects; Described electromagnetic intensity conversion module is made up of, for electromagnetic wave is converted into DC signal to be measured dipole antenna, LC match circuit, five rank voltage doubling rectifing circuits and voltage modulate circuit.The detection frequency range of described electromagnetic intensity conversion module is 900MHz ~ 2.4GHz, and the signal of monitoring different frequency adopts corresponding antenna.Main control module uses but is not limited to use the MSP 430 F1612 chip of Texas Instrument's production.
As shown in Figure 3, described LC match circuit is made up of tunable capacitor CV1 and chip inductor L1, described five rank voltage doubling rectifing circuits are made up of electric capacity Cs1, Cs2, Cs3, Cs4, Cs5, Cp1, Cp2, Cp3, Cp4, a commutation diode D6 and 10 Schottky rf diode, and described voltage modulate circuit is made up of Chip-R R1 and R2; Wherein, tunable capacitor CV1 one end connects antenna Antenna interface after being connected with chip inductor L1 one end, and the chip inductor L1 other end is connected with one end of electric capacity Cs1, Cs2, Cs3, Cs4, Cs5 respectively; the electric capacity Cs1 other end is connected with Schottky rf diode D1-1 one end and Schottky rf diode D1-2 one end respectively, the electric capacity Cs2 other end is connected with Schottky rf diode D2-1 one end and Schottky rf diode D2-2 one end respectively, the electric capacity Cs3 other end is connected with Schottky rf diode D3-1 one end and Schottky rf diode D3-2 one end respectively, the electric capacity Cs4 other end is connected with Schottky rf diode D4-1 one end and Schottky rf diode D4-2 one end respectively, the electric capacity Cs5 other end is connected with Schottky rf diode D5-1 one end and Schottky rf diode D5-2 one end respectively, the Schottky rf diode D1-2 other end connects one end of the first rank electric capacity Cp1 after being connected with the Schottky rf diode D2-1 other end, the Schottky rf diode D2-2 other end connects one end of second-order electric capacity Cp2 after being connected with the Schottky rf diode D3-1 other end, the Schottky rf diode D3-2 other end connects one end of the 3rd rank electric capacity Cp3 after being connected with the Schottky rf diode D4-1 other end, the Schottky rf diode D4-2 other end connects one end of quadravalence electric capacity Cp4 after being connected with the Schottky rf diode D5-1 other end, the Schottky rf diode D5-2 other end is connected with commutation diode D6 one end, the commutation diode D6 other end is connected with Chip-R R1 one end, the signal that the Chip-R R1 other end exports after being connected with Chip-R R2 one end is as the measuring-signal of main control chip A/D interface, the equal ground connection of the other end of the tunable capacitor CV1 other end, the Schottky rf diode D1-1 other end, the first rank electric capacity Cp1 other end, the second-order electric capacity Cp2 other end, the 3rd rank electric capacity Cp3 other end, the quadravalence electric capacity Cp4 other end and resistance R2.
As shown in Figure 2, described clock module comprises crystal oscillator Y1 and resistance R5, the clock input interface of the one termination main control chip U1 of described crystal oscillator Y1, connects the clock output interface of main control chip U1, the other end ground connection of resistance R5 after the other end of crystal oscillator Y1 is connected with one end of resistance R5;
Described earpiece audio mouth power conversion module by two N raceway groove metal-oxide half field effect transistor U5, two P raceway groove metal-oxide half field effect transistor U6, electric capacity C4-C8, C10, transformer T1, diode D1, resistance R8 and low-dropout regulator U3 form; The R channel of four-core earpiece audio mouth is connected with the input interface of the primary coil of transformer T1 and one end of electric capacity C8 respectively; The negative pole of diode D1 is connected with one end of one end of one end of electric capacity C5, electric capacity C6, tunable capacitor C7, one end of resistance R8, the enable interface (No. 1 interface) of low-dropout regulator chip U3 and signal input interface (No. 3 interfaces) respectively; The signal output interface (No. 4 interfaces) of low-dropout regulator chip U3 is connected with the power input interface (No. 1 and No. 64 interfaces) of main control chip U1, one end of electric capacity C10 and one end of electric capacity C4 respectively; The input interface of the same name of the secondary coil of transformer T1 respectively with the second gate pole interface (No. 5 interfaces), the first grid interface (No. 6 interfaces, No. 7 interfaces) of two N raceway groove metal-oxide half field effect transistor U5, the second gate pole interface (No. 5 interfaces), the first grid interface (No. 6 interfaces, No. 7 interfaces) of two P raceway groove metal-oxide half field effect transistor U6 are connected; The output interface of the same name of the secondary coil of transformer T1 respectively with the first gate pole interface (No. 2 interfaces), the second grid interface (No. 8 interfaces, No. 3 interfaces) of two N raceway groove metal-oxide half field effect transistor U5, the first gate pole interface (No. 2 interfaces), the second grid interface (No. 8 interfaces, No. 3 interfaces) of two P raceway groove metal-oxide half field effect transistor U6 are connected; Second source electrode interface (No. 4 interfaces), the first source electrode interface (No. 1 interface) of two P raceway groove metal-oxide half field effect transistor U6 are connected with the positive pole of diode D1; The first source electrode interface (No. 1 interface) of the other end of electric capacity C8, the output interface of transformer T1 primary coil, two N raceway groove metal-oxide half field effect transistor U5 and the second source electrode interface (No. 4 interfaces), the other end of electric capacity C5, the other end of electric capacity C6, the other end of tunable capacitor C7, the other end of resistance R8, the ground connection mouth (No. 2 interfaces) of low-dropout regulator chip U3, the other end of electric capacity C10, the equal ground connection of the other end of electric capacity C4;
Described earpiece audio port communications module is by inputting submodule and output sub-module forms; Output sub-module (module is to smart mobile phone direction) comprises resistance R3, R9, electric capacity C2, C9; The clock B of main control chip U1 catches output interface (No. 36 interfaces) and is connected with resistance R3 one end; The other end of resistance R3 is connected with one end of electric capacity C2 and electric capacity C9 respectively; The other end of electric capacity C9 is connected with the microphone opening of four-core earpiece audio mouth and resistance R9 one end respectively; The other end of resistance R9 and the equal ground connection of the other end of electric capacity C2; Input submodule (smart mobile phone is to module direction) is made up of resistance R14, R15 and electric capacity C1; The L channel of four-core earpiece audio mouth is connected with one end of electric capacity C1, and the other end of electric capacity C1 compares input interface (No. 23 interfaces) with the clock A of one end of resistance R14, one end of resistance R15 and main control chip U1 respectively and is connected; The resistance R14 other end is connected with the power input interface (No. 1 and No. 64 interfaces) of main control chip U1, resistance R15 other end ground connection; Other undeclared pin is all unsettled.
The workflow of apparatus of the present invention is as follows:
1, electromagnetic wave is through electromagnetic intensity conversion module, transforms into DC signal.The LC match circuit of adjustment dipole antenna rear end, reduces the reflection coefficient of antenna, improves the induced signal amplitude that electromagnetic wave produces at dipole antenna two ends.First ac signal by after five rank voltage doubling rectifing circuits, exports the DC signal being exaggerated five times.DC signal is by after voltage modulate circuit, and the digital-to-analogue outputting to main control module transforms A/D interface.
2, portable electromagnetic wave intensity detecting device is inserted in the audio port of smart mobile phone.Portable electromagnetic wave intensity detecting device obtains the electric energy from smart mobile phone by earpiece audio mouth power conversion module, drives whole device work, and system starts.
3, main control chip is started working, and arranges timer, enters dormant state.After timer triggered interrupts, exit park mode, the A connected by electromagnetic intensity conversion module/D interface reads electromagnetic intensity value.Setting electromagnetic intensity data packet format is: byte position, an interval, a store electricity magnetic wave intensity data high eight-bit byte position, with the byte position of low eight of a store electricity magnetic wave intensity data.
4, in order to enable data be passed on smart mobile phone by earpiece audio oral instructions, device must produce the simulating signal of continuous saltus step.For this reason, the bit stream that main control chip is corresponding to each electromagnetic intensity packet, is modulated to 01 according to true form 1, and the Synchronization rule that true form 0 is modulated to 10 is encoded, realized by the register arranging timer, data are outputted to the microphone interface of four-core audio port.
Claims (4)
1. based on a portable electromagnetic wave intensity detecting device for smartphone audio frequency mouth, it is characterized in that, this device is made up of main control module, earpiece audio mouth power conversion module, earpiece audio port communications module, clock module and electromagnetic intensity conversion module; Wherein, earpiece audio mouth power conversion module is all connected with smartphone audio frequency mouth with earpiece audio port communications module, and main control module is connected with electromagnetic intensity conversion module with earpiece audio mouth power conversion module, earpiece audio port communications module, clock module respectively; Described earpiece audio mouth power conversion module reclaims the energy of smartphone audio frequency mouth, powers to whole device; Described audio port communication module becomes simulating signal digital signal modulated, utilizes earpiece audio mouth to send to smart mobile phone; Described clock module provides stable clock signal to main control module; Described main control module measures the DC signal produced by electromagnetic intensity conversion module, generates electromagnetic intensity data, and send to smart mobile phone by earpiece audio port communications module through A/D translation interface, completes electromagnetic intensity and detects; Described electromagnetic intensity conversion module is made up of, for electromagnetic wave is converted into DC signal to be measured dipole antenna, LC match circuit, five rank voltage doubling rectifing circuits and voltage modulate circuit.
2. portable electromagnetic wave intensity detecting device according to claim 1, is characterized in that, the detection frequency range of described electromagnetic intensity conversion module is 900MHz ~ 2.4GHz, and the signal of monitoring different frequency adopts corresponding antenna.
3. portable electromagnetic wave intensity detecting device according to claim 1, it is characterized in that, described LC match circuit is made up of tunable capacitor CV1 and chip inductor L1, described five rank voltage doubling rectifing circuits are made up of electric capacity Cs1, Cs2, Cs3, Cs4, Cs5, Cp1, Cp2, Cp3, Cp4, a commutation diode D6 and 10 Schottky rf diode, and described voltage modulate circuit is made up of Chip-R R1 and R2; Wherein, tunable capacitor CV1 one end connects antenna Antenna interface after being connected with chip inductor L1 one end, and the chip inductor L1 other end is connected with one end of electric capacity Cs1, Cs2, Cs3, Cs4, Cs5 respectively; the electric capacity Cs1 other end is connected with Schottky rf diode D1-1 one end and Schottky rf diode D1-2 one end respectively, the electric capacity Cs2 other end is connected with Schottky rf diode D2-1 one end and Schottky rf diode D2-2 one end respectively, the electric capacity Cs3 other end is connected with Schottky rf diode D3-1 one end and Schottky rf diode D3-2 one end respectively, the electric capacity Cs4 other end is connected with Schottky rf diode D4-1 one end and Schottky rf diode D4-2 one end respectively, the electric capacity Cs5 other end is connected with Schottky rf diode D5-1 one end and Schottky rf diode D5-2 one end respectively, the Schottky rf diode D1-2 other end connects one end of the first rank electric capacity Cp1 after being connected with the Schottky rf diode D2-1 other end, the Schottky rf diode D2-2 other end connects one end of second-order electric capacity Cp2 after being connected with the Schottky rf diode D3-1 other end, the Schottky rf diode D3-2 other end connects one end of the 3rd rank electric capacity Cp3 after being connected with the Schottky rf diode D4-1 other end, the Schottky rf diode D4-2 other end connects one end of quadravalence electric capacity Cp4 after being connected with the Schottky rf diode D5-1 other end, the Schottky rf diode D5-2 other end is connected with commutation diode D6 one end, the commutation diode D6 other end is connected with Chip-R R1 one end, the signal that the Chip-R R1 other end exports after being connected with Chip-R R2 one end is as the measuring-signal of main control chip A/D interface, the equal ground connection of the other end of the tunable capacitor CV1 other end, the Schottky rf diode D1-1 other end, the first rank electric capacity Cp1 other end, the second-order electric capacity Cp2 other end, the 3rd rank electric capacity Cp3 other end, the quadravalence electric capacity Cp4 other end and resistance R2.
4. portable electromagnetic wave intensity detecting device according to claim 1, it is characterized in that, described clock module comprises crystal oscillator Y1 and resistance R5, the clock input interface of the one termination main control chip U1 of described crystal oscillator Y1, the clock output interface of main control chip U1 is connect, the other end ground connection of resistance R5 after the other end of crystal oscillator Y1 is connected with one end of resistance R5;
Described earpiece audio mouth power conversion module by two N raceway groove metal-oxide half field effect transistor U5, two P raceway groove metal-oxide half field effect transistor U6, electric capacity C4-C8, C10, transformer T1, diode D1, resistance R8 and low-dropout regulator U3 form; The R channel of four-core earpiece audio mouth is connected with the input interface of the primary coil of transformer T1 and one end of electric capacity C8 respectively; The negative pole of diode D1 is connected with one end of one end of one end of electric capacity C5, electric capacity C6, tunable capacitor C7, one end of resistance R8, the enable interface of low-dropout regulator chip U3 and signal input interface respectively; The signal output interface of low-dropout regulator chip U3 is connected with one end of the power input interface of main control chip U1, one end of electric capacity C10 and electric capacity C4 respectively; The input interface of the same name of the secondary coil of transformer T1 respectively with the second gate pole interface, the first grid interface of two N raceway groove metal-oxide half field effect transistor U5, the second gate pole interface, the first grid interface of two P raceway groove metal-oxide half field effect transistor U6 are connected; The output interface of the same name of the secondary coil of transformer T1 respectively with the first gate pole interface, the second grid interface of two N raceway groove metal-oxide half field effect transistor U5, the first gate pole interface, the second grid interface of two P raceway groove metal-oxide half field effect transistor U6 are connected; Second source electrode interface, the first source electrode interface of two P raceway groove metal-oxide half field effect transistor U6 are connected with the positive pole of diode D1; The first source electrode interface of the other end of electric capacity C8, the output interface of transformer T1 primary coil, two N raceway groove metal-oxide half field effect transistor U5 and the second source electrode interface, the other end of electric capacity C5, the other end of electric capacity C6, the other end of tunable capacitor C7, the other end of resistance R8, the ground connection mouth of low-dropout regulator chip U3, the other end of electric capacity C10, the equal ground connection of the other end of electric capacity C4;
Described earpiece audio port communications module is by inputting submodule and output sub-module forms; Output sub-module comprises resistance R3, R9, electric capacity C2, C9; The clock B of main control chip U1 catches output interface and is connected with resistance R3 one end; The other end of resistance R3 is connected with one end of electric capacity C2 and electric capacity C9 respectively; The other end of electric capacity C9 is connected with the microphone opening of four-core earpiece audio mouth and resistance R9 one end respectively; The other end of resistance R9 and the equal ground connection of the other end of electric capacity C2; Input submodule is made up of resistance R14, R15 and electric capacity C1; The L channel of four-core earpiece audio mouth is connected with one end of electric capacity C1, and the other end of electric capacity C1 compares input interface with the clock A of one end of resistance R14, one end of resistance R15 and main control chip U1 respectively and is connected; The resistance R14 other end is connected with the power input interface of main control chip U1, resistance R15 other end ground connection; Other undeclared pin is all unsettled.
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