CN110830058A - Frequency modulation transmitter device based on Bluetooth communication - Google Patents

Frequency modulation transmitter device based on Bluetooth communication Download PDF

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Publication number
CN110830058A
CN110830058A CN201910929638.6A CN201910929638A CN110830058A CN 110830058 A CN110830058 A CN 110830058A CN 201910929638 A CN201910929638 A CN 201910929638A CN 110830058 A CN110830058 A CN 110830058A
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resistor
capacitor
twenty
thirty
power amplifier
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CN110830058B (en
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林德耀
黄雪红
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Fujian University of Technology
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Fujian University of Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
    • H04B5/48—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Amplifiers (AREA)

Abstract

The invention discloses a frequency modulation transmitter device based on Bluetooth communication, which comprises: the mobile phone is provided with a Bluetooth communication transceiving module, an HC-05 Bluetooth communication transceiving module, an STC89C52 singlechip signal processing circuit, a power supply electronic switch control circuit, a third-stage power amplifier, a final-stage power amplifier, a first-stage power amplifier, a second-stage power amplifier, an automatic gain AGC control circuit, a delay AGC control circuit, an MIC audio amplification or external audio signal, a voltage-controlled oscillation and frequency modulation circuit, an OP07 active amplification circuit, an MC145152-2 frequency division and phase discrimination circuit and an MC12022AP prescaler; the MIC audio frequency amplification or external audio frequency signal output signal is transmitted to the voltage-controlled oscillation and frequency modulation circuit; the voltage-controlled oscillation and frequency modulation circuit outputs signals to the MC12022AP prescaler and the first-stage power amplifier; the MC12022AP prescaler outputs a signal to the MC145152-2 frequency division and phase detection circuit.

Description

Frequency modulation transmitter device based on Bluetooth communication
Technical Field
The invention relates to the field of circuits, in particular to a frequency modulation transmitter device based on Bluetooth communication.
Background
Currently marketed fm transmitters have problems:
1. all circuits are switched on when the computer is started, so that the waste of electric energy is caused;
2. the signal field intensity is unstable, and when the signal field intensity slides down, the noise of the receiver is large.
3. Most of the devices adopt the traditional push-pull type on-off, and have short service life.
Disclosure of Invention
The invention aims to provide a frequency modulation transmitter device based on Bluetooth communication, which can reduce the waste of electric energy.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a fm transmitter apparatus based on bluetooth communication, comprising:
the mobile phone is provided with a Bluetooth communication transceiving module 1, an HC-05 Bluetooth communication transceiving module 2, an STC89C52 singlechip signal processing circuit 3, a power supply electronic switch control circuit 4, a third-stage power amplifier 5, a final-stage power amplifier 6, a first-stage power amplifier 7, a second-stage power amplifier 8, an automatic gain AGC control circuit 10, a delay AGC control circuit 9, an MIC audio amplification or external audio signal 11, a voltage-controlled oscillation and frequency modulation circuit 12, an OP07 active amplification circuit 13, an MC145152-2 frequency division and phase discrimination circuit 14 and an MC12022AP prescaler 15;
wherein, MIC audio frequency amplification or external audio frequency signal 11 outputs signal to voltage control oscillation and frequency modulation circuit 12; the voltage-controlled oscillation and frequency modulation circuit 12 outputs signals to the MC12022AP prescaler 15 and the first power amplifier 7; the MC12022AP prescaler 15 outputs a signal to the MC145152-2 frequency division and phase detection circuit 14; the MC145152-2 frequency division and phase detection circuit 14 outputs a signal to the OP07 active filter circuit 13; the OP07 active filter circuit 13 outputs signals to the voltage-controlled oscillation and frequency modulation circuit 12; the first-stage power amplifier 7 outputs a frequency modulation signal to the second-stage power amplifier 8; the second-stage power amplifier 8 amplifies the output frequency modulation signal and sends the amplified signal to the third-stage power amplifier 5; the third-stage power amplifier 5 outputs the amplified frequency modulation signal to the final-stage power amplifier 6;
the final-stage power amplifier 6 is connected with the automatic gain AGC control circuit 10 through a fifteenth capacitor C35; the automatic gain AGC control circuit 10 respectively outputs signals to the first-stage power amplifier 7 and the delay AGC control circuit 9; the delay AGC control circuit 9 outputs signals to a second-stage power amplifier 8;
the HC-05 Bluetooth communication transceiver module 2 outputs a control signal to the STC89C52 singlechip signal processing circuit 3; the STC89C52 single chip microcomputer signal processing circuit 3 respectively outputs signals to the MC145152-2 frequency division and phase discrimination circuit 14 and the power supply electronic switch control circuit 4, and the power supply electronic switch control circuit 4 respectively outputs control signals to the third-stage power amplifier 5, the final-stage power amplifier 6, the first-stage power amplifier 7, the second-stage power amplifier 8, the automatic gain AGC control circuit 10 and the delay AGC control circuit 9;
the mobile phone with a Bluetooth communication transceiver module 1 sends a control signal of high-frequency modulation to the HC-05 Bluetooth communication transceiver module 2 according to a user instruction, the HC-05 Bluetooth communication transceiver module 2 transmits a data signal to the STC89C52 single chip microcomputer signal processing circuit 3 after receiving demodulation, and the data signal is respectively output to the MC145152-2 frequency division and phase discrimination circuit 14 and the power supply electronic switch control circuit 4 after being processed by the STC89C52 single chip microcomputer signal processing circuit 3; and the power supply electronic switch control circuit 4 controls the power supply of a third-stage power amplifier 5, a final-stage power amplifier 6, a first-stage power amplifier 7, a second-stage power amplifier 8, an automatic gain AGC control circuit 10 and a delay AGC control circuit 9 to be switched on and off according to the output control signal.
The invention has the beneficial effects that:
the invention can realize the real-time control of the working state of the four-stage power amplifier and the AGC automatic gain control circuit, and simultaneously utilizes the two-way wireless communication technology of the Bluetooth module, thereby reducing the waste of electric energy.
Drawings
Fig. 1 is a circuit block diagram of an fm transmitter apparatus based on bluetooth communication according to the present invention;
fig. 2 is a circuit block diagram of an fm transmitter apparatus based on bluetooth communication according to the present invention;
fig. 3 is a schematic circuit connection diagram of an fm transmitter apparatus based on bluetooth communication according to the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Fig. 1 is a circuit block diagram of an fm transmitter apparatus based on bluetooth communication according to the present invention; fig. 2 is another circuit block diagram of an fm transmitter apparatus based on bluetooth communication according to the present invention; fig. 3 is a schematic circuit connection diagram of an fm transmitter apparatus based on bluetooth communication according to the present invention. Described below in conjunction with fig. 1-3.
A fm transmitter apparatus based on bluetooth communication, comprising:
the mobile phone is provided with a Bluetooth communication transceiving module 1, an HC-05 Bluetooth communication transceiving module 2, an STC89C52 singlechip signal processing circuit 3, a power supply electronic switch control circuit 4, a third-stage power amplifier 5, a final-stage power amplifier 6, a first-stage power amplifier 7, a second-stage power amplifier 8, an automatic gain AGC control circuit 10, a delay AGC control circuit 9, an MIC audio amplification or external audio signal 11, a voltage-controlled oscillation and frequency modulation circuit 12, an OP07 active amplification circuit 13, an MC145152-2 frequency division and phase discrimination circuit 14 and an MC12022AP prescaler 15;
wherein, MIC audio frequency amplification or external audio frequency signal 11 outputs signal to voltage control oscillation and frequency modulation circuit 12; the voltage-controlled oscillation and frequency modulation circuit 12 outputs signals to the MC12022AP prescaler 15; the MC12022AP prescaler 15 outputs signal to the MC145152-2 frequency division and phase discrimination circuit 14; the MC145152-2 frequency division and phase discrimination circuit 14 outputs a signal to the OP07 active amplification circuit 13; the OP07 active amplification circuit 13 outputs signals to the voltage-controlled oscillation and frequency modulation circuit 12;
one path of the voltage-controlled oscillation and frequency modulation circuit 12 outputs a signal to the MC12022AP prescaler 15, and the other path outputs a signal to the first-stage power amplifier 7; the first-stage power amplifier 7 outputs a frequency modulation signal to the second-stage power amplifier 8; the second-stage power amplifier 8 outputs the amplified frequency modulation signal to the third-stage power amplifier 5; the third-stage power amplifier 5 outputs the amplified frequency modulation signal to the final-stage power amplifier 6;
the final-stage power amplifier 6 is connected with the automatic gain AGC control circuit 10 through a fifteenth capacitor C35; the automatic gain AGC control circuit 10 respectively outputs signals to the first-stage power amplifier 7 and the delay AGC control circuit 9; the delay AGC control circuit 9 outputs signals to a second-stage power amplifier 8;
the HC-05 Bluetooth communication transceiver module 2 outputs a control signal to the STC89C52 singlechip signal processing circuit 3; the STC89C52 single chip microcomputer signal processing circuit 3 respectively outputs signals to the MC145152-2 frequency division and phase discrimination circuit 14 and the power supply electronic switch control circuit 4, and the power supply electronic switch control circuit 4 respectively outputs control signals to the third-stage power amplifier 5, the final-stage power amplifier 6, the first-stage power amplifier 7, the second-stage power amplifier 8, the automatic gain AGC control circuit 10 and the delay AGC control circuit 9;
the mobile phone with a Bluetooth communication transceiver module 1 sends a control signal of high-frequency modulation to the HC-05 Bluetooth communication transceiver module 2 according to a user instruction, the HC-05 Bluetooth communication transceiver module 2 transmits a data signal to the STC89C52 single chip microcomputer signal processing circuit 3 after receiving demodulation, and the data signal is respectively output to the MC145152-2 frequency division and phase discrimination circuit 14 and the power supply electronic switch control circuit 4 after being processed by the STC89C52 single chip microcomputer signal processing circuit 3; and the power supply electronic switch control circuit 4 controls the power supply of a third-stage power amplifier 5, a final-stage power amplifier 6, a first-stage power amplifier 7, a second-stage power amplifier 8, an automatic gain AGC control circuit 10 and a delay AGC control circuit 9 to be switched on and off according to the output control signal.
The power supply electronic reset switch control circuit 4 includes:
the upper end of a thirteenth resistor R13 and a thirteenth resistor R13 is connected with a port P3.2 of the STC89C52 singlechip;
the lower end of the thirteenth resistor R13 is connected with the base electrode of the third triode VT3, and the collector electrode of the third triode VT3 is respectively connected with the base electrode of the fourth triode VT4 and the right end of the fourteenth resistor R14; the emitter of the third transistor VT3 is grounded;
the left end of the fourteenth resistor R14 is connected with a power supply; an emitter of the fourth triode VT4 is connected with a power supply, and a collector of the fourth triode VT4 is connected with the upper end of a twenty-sixth capacitor C26 through a fourth inductor L4; the lower end of the twenty-sixth capacitor C26 is grounded.
The delay AGC control circuit 9 and the AGC automatic gain control circuit 10 include:
the upper end of the thirty-eighth resistor R38 and the upper end of the thirty-eighth resistor R38 are connected with the base electrode of the fifth triode VT 5;
the lower end of the thirty-eighth resistor R38 is respectively connected with the anode of a thirty-ninth electrolytic capacitor C39, the upper end of a thirty-sixth resistor R36, the lower end of a thirty-seventh resistor R37 and the cathode of a third diode VD 3;
the negative electrode of the thirty-ninth electrolytic capacitor C39 and the lower end of the thirty-sixth resistor R36 are grounded;
the upper end of the thirty-seventh resistor R37 is respectively connected with the left end of the thirty-fifth resistor R35 and the left end of the thirty-second resistor R32;
the right end of the thirty-fifth resistor R35 is respectively connected with the left end of the second variable resistor RP2, the center tap of the second variable resistor RP2 and the upper end of the thirty-fourth resistor R34; the lower end of the thirty-fourth resistor R34 is grounded;
the right end of the second variable resistor RP2 is respectively connected with the right end of the thirty-second resistor R32, the upper end of the thirty-third resistor R30, the lower end of the twenty-third resistor R23 and the anode of the second diode VD 2;
the base electrode of the eighth emitter follower VT8 is connected with the left end of a twenty-ninth resistor R29;
a collector of the eighth emitter follower VT8 is respectively connected with the upper end of a thirty-seventh capacitor C37, the collector of the seventh tube VT7 and the left end of a twenty-sixth resistor R26; the lower end of a thirty-seventh capacitor C37 is grounded;
an emitter of the eighth emitter follower VT8 is respectively connected with the upper end of the thirty-first resistor R31, the lower end of the thirty-first resistor R30, the cathode of the second diode VD2, the anode of the thirty-eighth electrolytic capacitor C38 and the anode of the third diode VD 3; the negative electrode of the thirty-eighth electrolytic capacitor C38 and the lower end of the thirty-first resistor R31 are respectively connected with the ground;
the right end of the twenty-ninth resistor R29 is respectively connected with the anode of a thirty-sixth electrolytic capacitor C36 and the cathode of a fourth diode VD 4;
the anode of the fourth diode VD4 is connected to the upper end of the twenty-eighth resistor R28 and the emitter of the seventh triode VT7, respectively; the base electrode of the seventh triode VT7 is respectively connected with the upper end of a twenty-seventh resistor R27, the right end of a twenty-sixth resistor and the left end of a thirty-fifth capacitor C35; the lower end of the twenty-seventh resistor R27 is grounded;
the negative electrode of the thirty-sixth electrolytic capacitor C36 and the lower end of the twenty-eighth resistor R28 are grounded;
the right end of the thirty-fifth capacitor C35 is connected with the output end of the final-stage power amplifier circuit 6. (ii) a
The base electrode of the fifth triode VT5 is connected with the left end of the first capacitor C1; a collector of the fifth triode VT5 is connected to the upper end of the twentieth capacitor C20, the upper end of the twenty-second resistor R22, the upper end of the twenty-first variable capacitor C21, and the upper end of the primary coil of the second mutual inductor T2, respectively;
the emitter of the fifth triode VT5 is respectively connected with the upper ends of a twenty-second capacitor C22 and a twenty-first resistor R21, and the lower ends of the twenty-second capacitor C22 and the twenty-first resistor R21 are grounded
The base electrode of the sixth triode VT6 is respectively connected with the upper end of the twenty-third resistor R23 and the upper end of the twenty-seventh capacitor C27;
a collector of the sixth triode VT6 is connected to the upper end of the twenty-fourth resistor R24, the upper end of the twenty-ninth capacitor C29, the upper end of the thirty-first variable capacitor C30, and the upper end of the primary coil of the third mutual inductor T3, respectively;
an emitter of the sixth triode VT6 is grounded to the upper end of the twenty-eighth capacitor C28, the upper end of the twenty-fifth resistor R25, and the lower ends of the twenty-eighth capacitor C28 and the twenty-fifth resistor R25, respectively.
The MC145152-2 divide-by-frequency and phase-detecting circuit 14 includes:
the NO-N7 pin of the frequency synthesizer MC145152-2 is respectively connected with the P0.0-P0.7 ports of the singlechip STC89C52 and is connected with a resistor R01-R08 in parallel;
the AO-A5 pin and the N8, N9 pin of the frequency division and phase detector MC145152-2 are respectively connected with the P1.0-P1.7 port of the singlechip STC89C 52.
The signal processing circuit 3 of the single chip microcomputer STC89C52 comprises:
the single-chip microcomputer STC89C52 and a reset circuit;
the reset circuit is as follows:
the RST port of the singlechip STC89C52 is respectively connected with the lower end of a ninth resistor R9, the lower end of a first reset switch K1 and the negative electrode of a fifteenth electrolytic capacitor C15; the upper end of the ninth resistor R9 is grounded, and the upper end of the first reset switch K1 is connected with the anode of a fifteenth electrolytic capacitor C15;
the P2.7 port of the singlechip STC89C52 is respectively connected with the lower end of a seventeenth resistor R17 and the left end of a second reset switch K2; the upper end of the seventeenth resistor R17 is connected with a power supply; the right end of the second reset switch K2 is grounded;
a port P2.6 of the singlechip STC89C52 is respectively connected with the lower end of an eighteenth resistor R18 and the left end of a third reset switch K3; the upper end of the eighteenth resistor R18 is connected with a power supply; the right end of the third reset switch K3 is grounded;
a port P2.5 of the singlechip STC89C52 is respectively connected with the lower end of a nineteenth resistor R19 and the left end of a fourth reset switch K4; the upper end of the nineteenth resistor R19 is connected with a power supply; the right end of the fourth reset switch K4 is grounded.
The voltage-controlled oscillation and frequency modulation circuit 12 includes:
a collector of the first voltage-controlled oscillator VT1 is connected to the upper end of the first resistor R1, the upper end of the third inductor L3, and the upper end of the fifth capacitor C5, respectively; the lower end of the fifth capacitor C5 is grounded; the lower end of the third inductor L3 is connected with a power supply;
the base of the first voltage-controlled oscillator VT1 is respectively connected with the lower end of the first resistor R1, the left end of the fourth capacitor C4, the upper end of the third resistor R3 and the right end of the third capacitor C3;
the emitter of the first voltage-controlled oscillator VT1 is respectively connected with the upper end of the second capacitor C2, the upper end of the second resistor R2, the left end of the third capacitor C3 and the upper end of the second capacitor C2; the lower end of the second resistor R2, the lower end of the third resistor R3 and the lower end of the second capacitor (C2) are respectively grounded;
the right end of the fourth capacitor C4 is connected to the upper end of the sixth variable capacitor C6 and the left end of the primary coil of the first oscillating coupling coil T1 respectively;
the lower end of the sixth variable capacitor C6 is grounded;
the right end of the primary coil of the first oscillating coupling coil T1 is respectively connected with the upper end of a first inductor L1 and the negative electrode of a first diode VD 1; the anode of the first diode VD1 is grounded;
the lower end of the first inductor L1 is respectively connected with the anode of the tenth electrolytic capacitor C10 and the left end of the eighth capacitor C8; the right end of the eighth capacitor C8 is connected to ground.
The MIC audio amplification or external audio signal 11 includes:
when a center tap of the zeroth toggle switch KO is dialed to an upper end contact, the center tap is connected with an external Audio Input end Audio Input; when the center tap of the zeroth toggle switch KO is switched to a lower end contact, the center tap is connected with the negative electrode of a tenth electrolytic capacitor C10 and the negative electrode of a thirteenth capacitor C13;
the emitter of the second triode VT2 is respectively connected with the upper end of the twelfth resistor R12 and the anode of the zeroth electrolytic capacitor C0; the lower end of the twelfth resistor R12 and the negative electrode of the zero electrolytic capacitor C0 are grounded;
a collector of the second triode VT2 is respectively connected with the anode of the thirteenth electrolytic capacitor C13, the left end of the sixth resistor R6 and the right end of the seventh resistor; the right end of the sixth resistor R6 is respectively connected with the anode of the fifteenth electrolytic capacitor, the right end of the eighth resistor R8, the right end of the second inductor L2 and the upper end of the reset K1;
the base electrode of the second triode VT2 is respectively connected with the negative electrode of the fourteenth capacitor C14 and the left end of the seventh resistor R7;
the left end of the microphone MIC is grounded; the right end of the microphone MIC is respectively connected with the left end of the eighth resistor R8 and the anode of the fourteenth electrolytic capacitor C14;
the left end of the second inductor L2 is connected to the upper end of the third inductor L3.
The first stage attack circuit 7 of the four-stage power amplification circuit includes:
the right end of the first capacitor C1 is connected with the upper end of the second capacitor C2;
the lower end of the primary coil of the second mutual inductor T2 is respectively connected with the lower end of a twentieth capacitor C20, the lower end of a twenty-second resistor R22 and the lower end of a twenty-first variable capacitor C21;
the taps of the second mutual inductor T2 are respectively connected with the left end of a thirty-second resistor R32, the upper end of a forty-fourth capacitor C40 and the left end of a fourth inductor L4; the lower end of a fortieth capacitor C40 is grounded;
the upper end of the secondary coil of the second mutual inductor T2 is connected with the left end of a twenty-fifth capacitor C25; the right end of the twenty-fifth capacitor C25 is connected with the upper end of the twenty-seventh capacitor C27, and the lower end of the twenty-seventh capacitor C27 is grounded;
the lower end of the secondary coil of the second mutual coil T2 is grounded.
The second-stage power amplifier circuit 8 of the four-stage power amplifier circuit comprises:
the base electrode of the sixth triode VT6 is respectively connected with the right end of the capacitor C25, the upper end of the capacitor C27 and the upper end of the resistor R23;
an emitter of the sixth triode VT6 is respectively connected with the upper ends of a twenty-eighth capacitor C28 and a twenty-fifth resistor R25, and the lower ends of the twenty-eighth capacitor C28 and the twenty-fifth resistor R25 are both grounded;
a collector of a sixth triode VT6 is respectively connected with the upper end of a primary coil of a third mutual inductor T3, the upper end of a twenty-ninth capacitor C29, the upper end of a thirty-fourth variable capacitor C30 and the upper end of a twenty-fourth resistor R24, the lower end of a primary coil of a third mutual inductor T3 is connected with the lower end of a twenty-ninth capacitor C29, the lower end of a thirty-fourth variable capacitor C30 and the lower end of a twenty-fourth resistor R24, and a center tap of the third mutual inductor T3 is respectively connected with the right end of a fifth inductor L5 and the upper end of a thirty-first capacitor C31; an emitter of a sixth triode VT6 is connected with the upper end of a twenty-eighth capacitor C28 and the upper end of a twenty-fifth resistor R25; the lower end of the 28 th capacitor C28 and the lower end of the twenty-fifth resistor R25 are grounded;
the upper end of the secondary coil of the third mutual inductor T3 is connected with the upper end of a thirty-third capacitor C33, the upper end of a thirty-second capacitor C32 is connected with the lower end of the thirty-third capacitor and the input end of the second-stage power amplifier 8, and the lower end of the thirty-second capacitor C32, the lower end of the secondary coil of the third mutual inductor T3 and the lower end of a thirty-first capacitor C31 are all grounded.
The following is a detailed description.
A frequency modulation transmitter device based on Bluetooth communication and mobile phone App control is composed of a mobile phone self-contained Bluetooth communication transceiver module 1, an HC-05 Bluetooth communication transceiver module 2, an STC89C52 single chip microcomputer signal processing circuit 3, a power supply electronic switch control circuit 4, a third-stage power amplifier 5, a final-stage power amplifier 6, a first-stage power amplifier 7, a second-stage power amplifier 8, an automatic gain AGC control circuit 10, a delay AGC circuit 9, an MIC audio amplification or external audio signal 11, a voltage-controlled oscillation and frequency modulation circuit 12, an OP07 active amplification circuit 13, an MC145152-2 frequency division and phase discrimination circuit 14 and an MC120 12022AP prescaler 15, and the stability of output frequency is realized by adopting a frequency synthesis technology; and stabilizing the output power of the final stage by AGC automatic gain control. The working state of the four-stage power amplifier and AGC automatic gain control circuit is controlled in real time by adopting the Bluetooth technology, so that the aim of saving energy is fulfilled.
The device has the following characteristics:
a, stabilizing output frequency by adopting a frequency synthesis technology;
b, stabilizing the output power of the final stage by AGC automatic gain control;
and c, controlling the working states of the four-stage power amplifier and the AGC circuit in real time by adopting a Bluetooth technology.
Has the following beneficial effects: within the range of the service area of the transmitter, the transmitting frequency is stable, and the precision can reach 10-6And the field intensity of the transmitted signal can be stable; when the whole machine is started, the four-stage power amplifier and the automatic gain AGC control circuit are in a standby working state and are controlled by the Bluetooth mobile phone, so that the aim of saving energy is fulfilled.
The invention utilizes the work state of the wireless control transmitter realized by the Bluetooth duplex communication technology, and has the advantages of low cost, convenient operation, stable output frequency, stable output power and energy saving. The Bluetooth receiving and transmitting module of the mobile phone is utilized to download APP software in the mobile phone, secondary design is carried out and the APP software is installed, a visible icon group can be formed on a screen of the mobile phone, a user can control the working states of the four-stage power amplifier and the AGC circuit in real time by opening the icon group and pressing down a touch key of a corresponding functional icon, meanwhile, the two-way wireless communication technology of the Bluetooth module is utilized, the transmitting frequency of a frequency modulation transmitter can also be transmitted, and the working states of all the circuits are transmitted back to the screen of the mobile phone.
The individual circuits are described in detail below:
the Bluetooth wireless communication and control circuit comprises:
referring to the figure, the HC-05 bluetooth communication transceiver module 2 receives a signal sent by the bluetooth communication transceiver module 1 carried by the mobile phone, the signal is demodulated by the HC-05 bluetooth communication transceiver module 2 to form a digital signal, the 1-pin TXD port of the HC-05 bluetooth communication transceiver module 2 is output to the 10 th pin of the STC89C52 single chip microcomputer, namely the RXD end of the P3.0 port through the resistor R11 to perform data processing, when a 'start-up' instruction sent by the mobile phone is received, the 12 th pin P3.2 port of the STC89C52 single chip microcomputer outputs a high level, the base of the triode VT3 is made to be a high level through the resistor R13, the triode VT3 is conducted, the collector is a low level, the triode VT4 is forced to be saturated and conducted, the collector of the triode VT4 outputs a high level, and the four-stage power amplifier. Otherwise, the circuit does not work. Meanwhile, the transmitting frequency of the mobile phone and the working state information of the four-stage power amplifier and AGC automatic gain control circuit are transmitted to the RXD port of the Bluetooth module 2 from the P3.1TXD port of the 11 th pin of the singlechip STC89C52 through a resistor R10, then modulated and transmitted, and the information can be seen on the screen of the mobile phone after being amplified and demodulated by the Bluetooth receiving module 1 arranged on the mobile phone. Two-way communication is achieved.
A frequency synthesis and frequency modulation circuit:
referring to the figure, the frequency synthesis and modulation circuit comprises an IC3 STC89C52 singlechip, an IC1 prescaler MC12022AP, an IC4 frequency division and phase detector MC145152-2, an IC2 active filter OP07, a voltage-controlled oscillation circuit VT1 and a frequency modulation circuit. The STC89C52 single chip microcomputer P1.0-P1.7 ports are respectively connected with the ports 23, 21, 22, 24, 25, 10, 19 and 20 of the MC145152-2, namely A0-A5 and N8-N9; the STC89C52 single chip microcomputer is connected with MC145152-2, 11-18 ports, namely N0-N7, at P0.0-P0.7 ports, and is connected with a resistor R01-R08.
In a typical embodiment, since the frequency of the output signal of the vco is high, a signal with a lower frequency must be obtained by pre-dividing the output signal by an MC12022 chip. There are two division factors of 64 and 63 in MC12022, and 64 division is used in this design, i.e. P = 64.
The high-frequency oscillation signal output by the voltage-controlled oscillator VT1 is output from the secondary side of the oscillation coupling coil T1, is coupled to the 1 st pin of the IC1 prescaler 15MC12022AP through the capacitor C7 and the resistor R5 for frequency division, and the signal output by the 4 pins enters the 1 st pin of the frequency division and phase discrimination module 14 IC4 MC145152-2 for frequency division again and then is compared with the phase of the reference signal. In the design, a 10.24MHz sine wave signal generated by an external crystal oscillator of an MC145152-2 pin is used as a reference frequency signal, and a/R counter built in the MC145152 divides the frequency of the 10.24MHz reference frequency. In the design, R is 1024, namely RA0, RA1 and RA2 are 101, and the crystal oscillator frequency is divided by 1024 to obtain a reference frequency signal of 10 KHz.
According to the principle of swallow pulse counting: when the swallow pulse counter starts counting, the initial value of M is 1, A and N, the two counters are put into a preset number and count simultaneously, when AP +1 input pulses f are counted0When the A counter counts A preset numbers, M becomes 0; at the moment, the A/A counter is closed by a control signal, and counting is stopped; and the N/N counter also has N-A numbers, and outputs A pulse to the phase discriminator PD after continuously counting N-AP input pulses. At the end of a duty cycle, the A and N values are rewritten into the two down counters, M again becomes 1, and the process is repeated.
Q＝A（P＋1）+(N-A)P=PN+AThat is, the total frequency division coefficient of the swallow pulse counter is PN + a. The calculation formula can be obtained according to the principle: the A counter is 8 bits, so the A value is 63 max and the P value of MC12022 is 64. If reference frequency fR10kHz, the output frequency
f0＝（PN＋A）fR＝（64N＋A）×10kHz。
The carrier frequency is set to be 85MHz in the system design,
let A equal to 0, then
N＝（f0/ fR－A）/P =85MHz/10KHz/64=132.8125
The integer part of N is N =132
Frequency division coefficient N = 0010000100B (N9-N0)
A＝f0/ fR－PN = 85MHz/10KHz-64×132=52
Frequency division coefficient A =110100B (A5-A0)
The design of A, N values for the remaining frequencies is not repeated.
Thirdly, a field display circuit:
the LCD12864 liquid crystal display module 16 has a 4-pin RS port, a 5-pin R/W port and a 6-pin E-SCLK port connected to STC89C52-2 SCM 24P2.3, 23P2.2 and 22P2.1 ports; a17-pin RST port of the LCD12864 liquid crystal display module 16 is connected with a 21P2.0 pin of the single chip microcomputer STC89C52-2, and data information processed and designed by the single chip microcomputer STC89C52 is displayed on an LCD12864 liquid crystal display screen.
Fourth, audio frequency amplification and frequency modulation circuit
Referring to the figure, after the MIC microphone signal is amplified by the triode VT2, the MIC microphone signal is output from the collector of the triode VT2 to the lower end of the high-frequency choke coil L1 through the coupling capacitors C13 and C10, the Audio signal Input from the external Audio Input port is also Input to the lower end of the high-frequency choke coil L1 through the coupling capacitor C10, the manual switch K0 is used for achieving one of the two, the capacitor C8 is a filter capacitor for high-frequency interference signals, the high-frequency choke coil L1 can enable the Audio signal to pass through smoothly, and the high-frequency signal can be blocked, so that the Audio signal is added to the negative end of the varactor VD1 smoothly, and the voltage of the negative end of the varactor VD1 changes along with the change of the Audio signal, according to the change of the voltage VD1
Figure RE-GDA0002340675520000101
Push out to force its VT1 voltage controlled oscillation frequency f0The frequency modulation is realized along with the change of the audio signal. In a typical embodiment, the high frequency choke L1 is 10mH and the capacitor C8 is 1000 PF.
A fifth-stage power amplifying circuit:
referring to the figure, the capacitors C20 and C21 of the collector loop of the first stage VT5 and the primary side of the mutual inductor T2 in the four-stage power amplification circuit are resonant at the central frequency of 85MHz, and the capacitors C29 and C30 of the collector loop of the second stage VT6 and the primary side of the mutual inductor T3 are also resonant at the central frequency of 85MHz, and the bandwidth is 6 MHz. And a third stage power amplifier power exciting stage 5 and a final stage class-C power amplifier 6, wherein the effective value of the final stage output voltage can reach 5V. The load resistance is 75 Ώ, the final output power is: p0=52/75≈0.33w。
Sixthly, an automatic gain AGC control circuit:
referring to the figure, the peak-delay AGC circuit is adopted in the design, when an output signal is weak, the emitter VT8, the diodes VD3 and VD4 shown in the figure are all in an off state, and the VT7 is in a critical on state, as the signal is gradually increased, the emitter VT7 is turned on, the emitter voltage is increased, the VD4 is turned on to charge the electrolytic capacitor C36, the anode voltage of the electrolytic capacitor C36 is increased, the transistor VT8 is forced to be turned on, the emitter potential is raised, as the diode VD2 is in an on state, the potential of the positive terminal of the VD2 is increased, the base of the second-stage high-discharge VT6 is connected with the positive terminal of the VD2 through the resistor R23, the base potential of the transistor VT6 is forced to be raised, and as the second-stage VT6 is a forward AGC3DG56 tube, the gain of the amplifier will drop.
The working principle of the delayed AGC is as follows: with the further enhancement of the output signal, the voltage of the emitter of the triode VT8 is also continuously increased, the voltage of the emitter, that is, the voltage of the anode of the diode VD3 is increased, and with the continuous increase of the output signal, the voltage of the anode of the diode VD3 is increased, when the voltage of the anode of the diode VD3, 2AP9 is higher than the voltage of the cathode by 0.3V, the diode VD3 is turned from off to on, and the VD2 is turned from on to off, which means that the voltage of the base of the second stage high amplification is slowly changed, and can be regarded as being basically kept unchanged, that is, the second stage high amplification gain is basically unchanged, that is, the second stage high amplification gain is in a stop control state; and because the diode VD3 is conducted, the electrolytic capacitor C39 is charged, the voltage of the positive electrode of the capacitor C39 is increased, the base electrode potential of the first-stage high-level discharge tube VT5 is also raised through the resistor R38, and the starting control gain of the first-stage high-level discharge tube 3DG79 is reduced, so that the automatic gain control of the delay AGC is realized. The second-stage high-voltage discharge circuit is controlled firstly and then the first-stage high-voltage discharge circuit is controlled, so that the first-stage high-voltage discharge circuit is not controlled and is in a maximum gain amplification state under weak signals or signals with medium strength, and thus, the whole machine can be ensured to have higher signal-to-noise ratio.
Seven, singlechip STC89C52 circuit
Referring to the figure, the resistor R9, the reset switch K1 and the electrolytic capacitor C15 form a reset circuit, and the circuit is just started
At the moment, because the voltage at the two ends of the capacitor C15 cannot suddenly change, which is equivalent to that the 9 th pin of the singlechip STC89C52 is at a high level, the circuit is reset, and a PC pointer of a built-in program of the singlechip is in an initial state, namely, A, N values output by ports P0 and P1 enable a sine wave signal with the initial frequency of 85MHz output by the voltage-controlled oscillator. The setting key of the reset switch K2 is pressed, and then the plus and minus keys of the reset switches K3 and K4 are reset, the step length is 0.25MHz, and the frequency range can be set at any point of 82-88 MHz.
The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims (9)

1. A fm transmitter apparatus based on bluetooth communication, comprising:
the mobile phone is provided with a Bluetooth communication transceiving module (1), an HC-05 Bluetooth communication transceiving module (2), an STC89C52 singlechip signal processing circuit (3), a power supply electronic switch control circuit (4), a third-stage power amplifier (5), a final-stage power amplifier (6), a first-stage power amplifier (7), a second-stage power amplifier (8), an automatic gain AGC control circuit (10), a delay AGC control circuit (9), an MIC audio amplification or external audio signal (11), a voltage-controlled oscillation and frequency modulation circuit (12), an OP07 active amplification circuit (13), an MC145152-2 frequency division and phase discrimination circuit (14) and an MC12022AP prescaler (15);
wherein, MIC audio frequency amplification or external audio frequency signal (11) output signal to voltage control oscillation and frequency modulation circuit (12); the voltage-controlled oscillation and frequency modulation circuit (12) outputs signals to the MC12022AP prescaler (15) and the first power amplifier (7); the MC12022AP prescaler (15) outputs signals to the MC145152-2 frequency division and phase discrimination circuit (14); the MC145152-2 frequency division and phase detection circuit (14) outputs a signal to an OP07 active filter circuit (13); the OP07 active filter circuit (13) outputs signals to the voltage-controlled oscillation and frequency modulation circuit (12);
one path of the voltage-controlled oscillation and frequency modulation circuit (12) outputs a signal to the MC12022AP prescaler (15), and the other path of the voltage-controlled oscillation and frequency modulation circuit outputs a signal to the first-stage power amplifier (7); the first-stage power amplifier (7) outputs a frequency modulation signal to the second-stage power amplifier (8); the second-stage power amplifier (8) outputs the amplified frequency modulation signal to the third-stage power amplifier (5); the third-stage power amplifier (5) outputs the amplified frequency modulation signal to a final-stage power amplifier (6);
the final-stage power amplifier (6) is connected with the automatic gain AGC control circuit (10) through a thirty-fifth capacitor (C35); the automatic gain AGC control circuit (10) respectively outputs signals to the first-stage power amplifier (7) and the delay AGC control circuit (9); the delay AGC control circuit (9) outputs signals to a second-stage power amplifier (8);
the HC-05 Bluetooth communication transceiver module (2) outputs a control signal to the STC89C52 singlechip signal processing circuit (3); the STC89C52 single chip microcomputer signal processing circuit (3) respectively outputs signals to the MC145152-2 frequency division and phase discrimination circuit (14) and the power supply electronic switch control circuit (4), and the power supply electronic switch control circuit (4) respectively outputs control signals to the third-stage power amplifier (5), the final-stage power amplifier (6), the first-stage power amplifier (7), the second-stage power amplifier (8), the automatic gain AGC control circuit (10) and the delay AGC control circuit (9);
the mobile phone is provided with a Bluetooth communication transceiver module (1) which sends a control signal of high-frequency modulation to an HC-05 Bluetooth communication transceiver module (2) according to a user instruction, the HC-05 Bluetooth communication transceiver module (2) transmits a data signal to an STC89C52 singlechip signal processing circuit (3) after receiving and demodulating, and the data signal is respectively output to an MC145152-2 frequency division and phase discrimination circuit (14) and a power electronic switch control circuit (4) after being processed by the STC89C52 singlechip signal processing circuit (3); and the power supply electronic switch control circuit (4) controls the power supply of the third-stage power amplifier (5), the final-stage power amplifier (6), the first-stage power amplifier (7), the second-stage power amplifier (8), the automatic gain AGC control circuit (10) and the delay AGC control circuit (9) to be switched on and off according to the output control signal.
2. The device according to claim 1, characterized in that the power electronic reset switch control circuit (4) comprises:
the upper end of the thirteenth resistor (R13) is connected with a P3.2 port of the STC89C52 singlechip;
the lower end of the thirteenth resistor (R13) is connected with the base electrode of the third triode (VT3), and the collector electrode of the third triode (VT3) is respectively connected with the base electrode of the fourth triode (VT4) and the right end of the fourteenth resistor (R14); the emitter of the third triode (VT3) is grounded;
the left end of the fourteenth resistor (R14) is connected with a power supply; an emitter of the fourth triode (VT4) is connected with a power supply, and a collector of the fourth triode (VT4) is connected with the upper end of a twenty-sixth capacitor (C26) through a fourth inductor (L4); the lower end of the twenty-sixth capacitor (C26) is grounded.
3. The arrangement according to claim 1, wherein the delay AGC control circuit (9) and AGC automatic gain control circuit (10) comprise:
the upper end of the thirty-eighth resistor (R38) is connected with the base electrode of the fifth triode (VT 5);
the lower end of the thirty-eighth resistor (R38) is respectively connected with the anode of the thirty-ninth electrolytic capacitor (C39), the upper end of the thirty-sixth resistor R36, the lower end of the thirty-seventh resistor (R37) and the cathode of the third diode (VD 3);
the negative electrode of the thirty-ninth electrolytic capacitor (C39) and the lower end of the thirty-sixth resistor (R36) are grounded;
the upper end of the thirty-seventh resistor (R37) is respectively connected with the left end of the thirty-fifth resistor (R35) and the left end of the thirty-second resistor (R32);
the right end of the thirty-fifth resistor (R35) is respectively connected with the left end of the second variable resistor (RP2) and the upper end of the second variable resistor (RP2 center tap and thirty-fourth resistor (R34); the lower end of the thirty-fourth resistor (R34) is grounded;
the right end of the second variable resistor (RP2) is connected with the right end of a thirty-second resistor (R32), the upper end of a thirty-third resistor (R30), the lower end of a twenty-third resistor (R23) and the anode of a second diode (VD2) respectively;
the base electrode of the eighth emitter follower (VT8) is connected with the left end of the twenty-ninth resistor (R29);
the collector of the eighth emitter follower (VT8) is respectively connected with the upper end of a thirty-seventh capacitor (C37), the collector of the seventh tube (VT7) and the left end of a twenty-sixth resistor (R26); the lower end of the thirty-seventh capacitor (C37) is grounded;
an emitter of the eighth emitter-follower (VT8) is respectively connected with the upper end of the thirty-first resistor (R31), the lower end of the thirty-first resistor (R30), the cathode of the second diode (VD2), the anode of the thirty-eighth electrolytic capacitor (C38) and the anode of the third diode (VD 3); the negative electrode of the thirty-eighth electrolytic capacitor (C38) and the lower end of the thirty-first resistor (R31) are respectively connected with the ground;
the right end of the twenty-ninth resistor (R29) is respectively connected with the anode of the thirty-sixth electrolytic capacitor (C36) and the cathode of the fourth diode (VD 4);
the anode of the fourth diode (VD4) is respectively connected with the upper end of the twenty-eighth resistor (R28) and the emitter of the seventh triode (VT 7); the base electrode of the seventh triode (VT7) is respectively connected with the upper end of the twenty-seventh resistor (R27), the right end of the twenty-sixth resistor (R26) and the left end of the thirty-fifth capacitor (C35); the lower end of the twenty-seventh resistor (R27) is grounded;
the negative electrode of the thirty-sixth electrolytic capacitor (C36) and the lower end of the twenty-eighth resistor (R28) are grounded;
the right end of the thirty-fifth capacitor (C35) is connected with the output end of the final-stage power amplifier circuit (6). (ii) a
The base electrode of the fifth triode (VT5) is connected with the left end of the first capacitor (C1); a collector of the fifth triode (VT5) is respectively connected with the upper end of a twentieth capacitor (C20), the upper end of a twenty-second resistor (R22), the upper end of a twenty-first variable capacitor (C21) and the upper end of a primary coil of a second mutual inductor (T2);
an emitter of the fifth triode (VT5) is respectively connected with the upper ends of a twenty-second capacitor (C22) and a twenty-first resistor (R21), and the lower ends of the twenty-second capacitor (C22) and the twenty-first resistor (R21) are grounded;
the base electrode of the sixth triode (VT6) is respectively connected with the upper end of the twenty-third resistor (R23) and the upper end of the twenty-seventh capacitor (C27);
a collector of the sixth triode (VT6) is respectively connected with the upper end of a twenty-fourth resistor (R24), the upper end of a twenty-ninth capacitor (C29), the upper end of a thirty-variable capacitor (C3)0 and the upper end of a primary coil of a third mutual inductor (T3);
an emitter of the sixth triode (VT6) is respectively connected with the upper end of the twenty-eighth capacitor (C28), the upper end of the twenty-fifth resistor (R25), and the lower ends of the twenty-eighth capacitor (C28) and the twenty-fifth resistor (R25) are grounded.
4. The apparatus of claim 1, wherein the MC145152-2 divide-by-two and phase-detect circuit (14) comprises:
the NO-N7 pin of the frequency synthesizer MC145152-2 is respectively connected with the P0.0-P0.7 ports of the singlechip STC89C52 and is connected with a resistor array (R01-R08) in parallel;
the AO-A5 pin and the N8, N9 pin of the frequency division and phase detector MC145152-2 are respectively connected with the P1.0-P1.7 port of the singlechip STC89C 52.
5. The device according to claim 1, wherein the single-chip microcomputer STC89C52 signal processing circuit (3) comprises:
the single-chip microcomputer STC89C52 and a reset circuit;
the reset circuit is as follows:
the RST port of the singlechip STC89C52 is respectively connected with the lower end of a ninth resistor (R9), the lower end of a first reset switch (K1) and the negative electrode of a fifteenth electrolytic capacitor (C15); the upper end of the ninth resistor (R9) is grounded, and the upper end of the first reset switch (K1) is connected with the anode of a fifteenth electrolytic capacitor (C15);
the P2.7 port of the singlechip STC89C52 is respectively connected with the lower end of a seventeenth resistor (R17) and the left end of a second reset switch (K2); the upper end of the seventeenth resistor (R17) is connected with a power supply; the right end of the second reset switch (K2) is grounded;
a P2.6 port of the singlechip STC89C52 is respectively connected with the lower end of an eighteenth resistor (R18) and the left end of a third reset switch (K3); the upper end of the eighteenth resistor (R18) is connected with the power supply; the right end of the third reset switch (K3) is grounded;
the P2.5 port of the singlechip STC89C52 is respectively connected with the upper end of a nineteenth resistor (R19) and the left end of a fourth reset switch (K4); the right end of the nineteenth resistor (R19) is connected with a power supply; the right end of the fourth reset switch (K4) is grounded.
6. The apparatus of claim 1, wherein the voltage controlled oscillation and frequency modulation circuit (12) comprises:
a first voltage-controlled oscillator (VT1), wherein the collector of the first voltage-controlled oscillator (VT1) is respectively connected with the upper end of a first resistor (R1), the upper end of a third inductor (L3) and the upper end of a fifth capacitor (C5); the lower end of the fifth capacitor (C5) is grounded; the lower end of the third inductor (L3) is connected with a power supply;
the base electrode of the first voltage-controlled oscillator (VT1) is respectively connected with the lower end of a first resistor (R1), the left end of a fourth capacitor (C4), the upper end of a third resistor (R3) and the right end of a third capacitor (C3);
the emitter of the first voltage-controlled oscillator (VT1) is respectively connected with the upper end of a second capacitor (C2), the upper end of a second resistor (R2), the left end of a third capacitor (C3) and the upper end of a second capacitor (C2); the lower end of the second resistor (R2), the lower end of the third resistor (R3) and the lower end of the second capacitor (C2) are respectively grounded;
the right end of the fourth capacitor (C4) is connected with the upper end of the sixth variable capacitor (C6) and the left end of the primary coil of the first oscillation coupling coil (T1) respectively;
the lower end of the sixth variable capacitor (C6) is grounded;
the right end of the primary coil of the first oscillating coupling coil (T1) is respectively connected with the upper end of a first inductor (L1) and the negative electrode of a first diode (VD 1); the anode of the first diode (VD1) is grounded;
the lower end of the first inductor (L1) is respectively connected with the positive electrode of the tenth electrolytic capacitor (C10) and the left end of the eighth capacitor (C8); the right end of the eighth capacitor (C8) is grounded.
7. The apparatus of claim 1, wherein the MIC audio amplification or external audio signal (11) comprises:
when a center tap of a zeroth toggle switch (KO) is switched to an upper end contact, the center tap is connected with an external Audio Input end; when the center tap of the zeroth toggle switch (KO) is switched to a lower end contact, the center tap of the zeroth toggle switch is connected with the negative electrode of the tenth electrolytic capacitor (C10) and the negative electrode of the thirteenth capacitor (C13);
the emitter of the second triode (VT2) is respectively connected with the upper end of the twelfth resistor (R12) and the anode of the zeroth electrolytic capacitor (C0); the lower end of the twelfth resistor (R12) and the negative electrode of the zeroth electrolytic capacitor (C0) are grounded;
the collector of the second triode (VT2) is respectively connected with the anode of the thirteenth electrolytic capacitor (C13), the left end of the sixth resistor (R6) and the right end of the seventh resistor (R7); the right end of the sixth resistor (R6) is connected with the anode of the fifteenth electrolytic capacitor (C15), the right end of the eighth resistor (R8) and the right end of the second inductor (L2) respectively;
the base electrode of the second triode (VT2) is respectively connected with the negative electrode of the fourteenth capacitor (C14) and the left end of the seventh resistor (R7);
the left end of the microphone MIC is grounded; the right end of the microphone MIC is respectively connected with the left end of an eighth resistor (R8) and the anode of a fourteenth electrolytic capacitor (C14);
the left end of the second inductor (L2) is connected with the upper end of the third inductor (L3).
8. The arrangement according to claim 1, characterized in that the first stage tapping circuit (7) of the four-stage power amplification circuit comprises:
the right end of the first capacitor (C1) is connected with the upper end of the second capacitor (C2);
the lower end of the primary coil of the second mutual inductor (T2) is respectively connected with the lower end of a twentieth capacitor (C20), the lower end of a twenty-second resistor (R22) and the lower end of a twenty-first variable capacitor (C21);
taps of the second mutual inductor (T2) are respectively connected with the left end of a thirty-second resistor (R32), the upper end of a forty-fourth capacitor (C40) and the left end of a fourth inductor coil (L4); the lower end of a fortieth capacitor (C40) is grounded;
the upper end of the secondary coil of the second mutual inductor (T2) is connected with the left end of a twenty-fifth capacitor (C25); the right end of the twenty-fifth capacitor (C25) is connected with the upper end of the twenty-seventh capacitor (C27), and the lower end of the twenty-seventh capacitor (C27) is grounded;
the lower end of the secondary coil of the second mutual coil (T2) is grounded.
9. The apparatus of claim 1, wherein the second stage power amplifier circuit (8) of the four-stage power amplifier circuit comprises:
the base electrode of the sixth triode (VT6) is respectively connected with the right end of the capacitor (C25), the upper end of the capacitor (C27) and the upper end of the resistor (C23);
an emitter of the sixth triode (VT6) is respectively connected with the upper ends of a twenty-eighth capacitor (C28) and a twenty-fifth resistor (R25), and the lower ends of the twenty-eighth capacitor (C28) and the twenty-fifth resistor (R25) are grounded;
a collector of a sixth triode (VT6) is respectively connected with the upper end of a primary coil of a third mutual inductor (T3), the upper end of a twenty-ninth capacitor (C29), the upper end of a thirty-first variable capacitor (C30) and the upper end of a twenty-fourth resistor (R24), the lower end of the primary coil of the third mutual inductor (T3) is connected with the lower end of the twenty-ninth capacitor (C29), the lower end of the thirty-first variable capacitor (C30) and the lower end of the twenty-fourth resistor (R24), and a center tap of the third mutual inductor (T3) is respectively connected with the right end of a fifth inductor (L5) and the upper end of a thirty-first capacitor (C31); an emitter of the sixth triode (VT6) is connected with the upper end of a twenty-eighth capacitor (C28) and the upper end of a twenty-fifth resistor (R25); the lower end of the twenty-eighth capacitor (C28) and the lower end of the twenty-fifth resistor (R25) are grounded;
the upper end of a secondary coil of a third mutual inductor (T3) is connected with the upper end of a thirty-third capacitor (C33), the upper end of a thirty-second capacitor (C32) is connected with the lower end of the thirty-third capacitor (C33) and the input end of a third-stage power amplifier (5), and the lower end of the thirty-second capacitor (C32), the lower end of a secondary coil of the third mutual inductor (T3) and the lower end of a thirty-first capacitor (C31) are all grounded; the lower end of a thirty-fourth capacitor (C34) is connected with a third-stage power amplifier (5), and the upper end is connected with a final-stage power amplifier (6); the output of the final power amplifier (6) is connected with the antenna.
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