CN106454639A - Low-voltage frequency modulation circuit for wireless earphone - Google Patents

Low-voltage frequency modulation circuit for wireless earphone Download PDF

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Publication number
CN106454639A
CN106454639A CN201610621025.2A CN201610621025A CN106454639A CN 106454639 A CN106454639 A CN 106454639A CN 201610621025 A CN201610621025 A CN 201610621025A CN 106454639 A CN106454639 A CN 106454639A
Authority
CN
China
Prior art keywords
circuit
electric capacity
audion
low
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610621025.2A
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Chinese (zh)
Inventor
熊昆明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beihai Ming Jie Technology Co Ltd
Original Assignee
Beihai Ming Jie Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beihai Ming Jie Technology Co Ltd filed Critical Beihai Ming Jie Technology Co Ltd
Priority to CN201610621025.2A priority Critical patent/CN106454639A/en
Publication of CN106454639A publication Critical patent/CN106454639A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00Circuits for transducers, loudspeakers or microphones
    • H04R3/04Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00Signal processing covered by H04R, not provided for in its groups
    • H04R2430/03Synergistic effects of band splitting and sub-band processing

Abstract

The invention provides a low-voltage frequency modulation circuit for a wireless earphone. The low-voltage frequency modulation circuit comprises a battery, a sound signal input circuit, a triode bias circuit, an oscillating circuit and a high-frequency signal transmitting circuit, wherein the sound signal input circuit is composed of an electret microphone, a first resistor and a first electrolytic capacitor; the output end of the electret microphone is connected with one end of the first resistor and the cathode of the first electrolytic capacitor, and a metal housing of the electret microphone is connected with the circuit in an earthing way. The low-voltage battery frequency modulation wireless microphone has the characteristics that the circuit structure is simple, the high-frequency oscillating frequency is stable, the transmitting distance reaches 50 meters, the power consumption is low, the manufacturing cost is low and the like. When the voltage of the battery is less than 1 volt, an alarm is given to prompt battery replacement.

Description

A kind of wireless headset low-voltage FM circuit
Technical field
The present invention relates to circuit field, more specifically to a kind of wireless headset low-voltage FM circuit.
Background technology
With the raising that the development of automatic technology and people are required to living standard, the fidelity such as wireless headset requires relatively High audio signal transmission, can be used for the activity such as aided education or Karaoke in lyceum.Low-voltage battery frequency modulation wireless microphone Simple with circuit structure, higher-order of oscillation frequency stable, transmitting range reach 25 meters, power consumption is few, the low feature that makes this.
Content of the invention
In order to overcome the shortcomings of in background technology, the invention discloses a kind of wireless headset low-voltage FM circuit.
The technical scheme is that:A kind of wireless headset low-voltage FM circuit, is input into including battery, acoustical signal Circuit, audion biasing circuit, oscillating circuit and high-frequency signal radiating circuit, the acoustical signal input circuit is talked about by electret Cylinder, first resistor, the first electrochemical capacitor composition, one end of the output termination first resistor of Electret condenser microphone and the first electrochemical capacitor Negative pole, be connected the metal shell of Electret condenser microphone and circuit, another termination circuit anode of first resistor, the first electrolysis electricity The positive pole of appearance connects the base stage of audion;The audion biasing circuit is made up of audion and second resistance, the base stage of audion Connect one end of second resistance, another termination circuit anode of second resistance;The oscillating circuit and high-frequency signal radiating circuit by Audion, higher-order of oscillation coil, the 3rd electric capacity, the second electric capacity, negative feedback electric capacity, the 5th electric capacity, negative feedback resistor, coupled capacitor Constitute with transmitting antenna, one end of the colelctor electrode of audion and higher-order of oscillation coil, one end of the 5th electric capacity, negative feedback electric capacity One end of one end and coupled capacitor is connected, another termination circuit anode of the other end of higher-order of oscillation coil and the 5th electric capacity, coupling The other end for closing electric capacity connects transmitting antenna, the other end of the emitter stage of audion with negative feedback electric capacity, one end of negative feedback resistor Be connected with one end of the 3rd electric capacity, another termination circuit anode of the 3rd electric capacity, the other end of negative feedback resistor and circuit ground phase Even;The anode is connected with circuit anode, is connected battery cathode and circuit, is also included a controller and warning circuit, The controller is connected with warning circuit, battery, the numerical value of the controller receiving voltage, and according to receive numerical value come to Warning circuit applies control signal;The controller is connected with the high-frequency signal radiating circuit, and the controller is also with outward Earphone player be connected.
Preferably, when cell voltage is less than 0.5 volt, the controller applies control signal to warning circuit.
Beneficial effects of the present invention:Low-voltage battery frequency modulation wireless microphone of the present invention has circuit structure simply, high frequency vibrating Swing frequency stable, transmitting range reach 50 meters, power consumption is few, low manufacture cost the features such as.When cell voltage is less than 1 volt, can To be reported to the police, so as to point out to carry out battery altering.
Specific embodiment
The embodiment the in conjunction with specific embodiments present invention being provided is described in further detail:
A kind of wireless headset low-voltage FM circuit of the present invention, including battery, acoustical signal input circuit, audion Biasing circuit, oscillating circuit and high-frequency signal radiating circuit, the acoustical signal input circuit is by Electret condenser microphone, the first electricity Resistance, the first electrochemical capacitor composition, output termination one end of first resistor of Electret condenser microphone and the negative pole of the first electrochemical capacitor, stay It is connected the metal shell of electret microphone and circuit, another termination circuit anode of first resistor, the positive pole of the first electrochemical capacitor Connect the base stage of audion;The audion biasing circuit is made up of audion and second resistance, and the base stage of audion connects the second electricity One end of resistance, another termination circuit anode of second resistance;The oscillating circuit and high-frequency signal radiating circuit are by audion, height Frequency oscillator coil, the 3rd electric capacity, the second electric capacity, negative feedback electric capacity, the 5th electric capacity, negative feedback resistor, coupled capacitor and transmitting day Line constitutes, one end of the colelctor electrode of audion and higher-order of oscillation coil, one end of the 5th electric capacity, one end of negative feedback electric capacity and coupling The one end for closing electric capacity is connected, another termination circuit anode of the other end of higher-order of oscillation coil and the 5th electric capacity, coupled capacitor The other end connects transmitting antenna, the emitter stage of audion and the other end of negative feedback electric capacity, one end of negative feedback resistor and the 3rd electricity One end of appearance is connected, another termination circuit anode of the 3rd electric capacity, is connected the other end of negative feedback resistor and circuit;The electricity Pond positive pole is connected with circuit anode, is connected battery cathode and circuit, is also included a controller and warning circuit, the controller It is connected with warning circuit, battery, the numerical value of the controller receiving voltage, and applied to warning circuit according to the numerical value for receiving Increase control signal;The controller is connected with the high-frequency signal radiating circuit, the controller also with external player It is connected.
Preferably, when cell voltage is less than 0.8 volt, the controller applies control signal to warning circuit.More excellent Ground, when cell voltage is less than 1 volt, can be reported to the police, so as to point out to carry out battery altering.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that can still make Various modifications and alterations are without departing from the spirit and scope of the present invention.Therefore, description is considered as illustrative rather than limit Property processed.

Claims (2)

1. a kind of wireless headset low-voltage FM circuit, it is characterised in that including battery, acoustical signal input circuit, three poles Pipe biasing circuit, oscillating circuit and high-frequency signal radiating circuit, the acoustical signal input circuit is by Electret condenser microphone, the first electricity Resistance, the first electrochemical capacitor composition, output termination one end of first resistor of Electret condenser microphone and the negative pole of the first electrochemical capacitor, stay It is connected the metal shell of electret microphone and circuit, another termination circuit anode of first resistor, the positive pole of the first electrochemical capacitor Connect the base stage of audion;The audion biasing circuit is made up of audion and second resistance, and the base stage of audion connects the second electricity One end of resistance, another termination circuit anode of second resistance;The oscillating circuit and high-frequency signal radiating circuit are by audion, height Frequency oscillator coil, the 3rd electric capacity, the second electric capacity, negative feedback electric capacity, the 5th electric capacity, negative feedback resistor, coupled capacitor and transmitting day Line constitutes, one end of the colelctor electrode of audion and higher-order of oscillation coil, one end of the 5th electric capacity, one end of negative feedback electric capacity and coupling The one end for closing electric capacity is connected, another termination circuit anode of the other end of higher-order of oscillation coil and the 5th electric capacity, coupled capacitor The other end connects transmitting antenna, the emitter stage of audion and the other end of negative feedback electric capacity, one end of negative feedback resistor and the 3rd electricity One end of appearance is connected, another termination circuit anode of the 3rd electric capacity, is connected the other end of negative feedback resistor and circuit;The electricity Pond positive pole is connected with circuit anode, is connected battery cathode and circuit, is also included a controller and warning circuit, the controller It is connected with warning circuit, battery, the numerical value of the controller receiving voltage, and applied to warning circuit according to the numerical value for receiving Increase control signal;The controller is connected with the high-frequency signal radiating circuit, and the controller is also broadcast with external earphone Put device to be connected.
2. wireless headset according to claim 1 low-voltage FM circuit, it is characterised in that be less than in cell voltage When 0.5 volt, the controller applies control signal to warning circuit.
CN201610621025.2A 2016-08-02 2016-08-02 Low-voltage frequency modulation circuit for wireless earphone Pending CN106454639A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610621025.2A CN106454639A (en) 2016-08-02 2016-08-02 Low-voltage frequency modulation circuit for wireless earphone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610621025.2A CN106454639A (en) 2016-08-02 2016-08-02 Low-voltage frequency modulation circuit for wireless earphone

Publications (1)

Publication Number Publication Date
CN106454639A true CN106454639A (en) 2017-02-22

Family

ID=58184389

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610621025.2A Pending CN106454639A (en) 2016-08-02 2016-08-02 Low-voltage frequency modulation circuit for wireless earphone

Country Status (1)

Country Link
CN (1) CN106454639A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1846456A (en) * 2003-07-10 2006-10-11 Toa株式会社 Transmitter of wireless microphone, receiver for wireless microphone, mobile information communication apparatus, and communication system for wireless microphone
JP2007159194A (en) * 2005-12-01 2007-06-21 Audio Technica Corp Wireless transmitter
CN201732118U (en) * 2010-07-19 2011-02-02 深圳市富业达实业发展有限公司 Computer wireless product low-pressure alarm
CN202495147U (en) * 2012-03-13 2012-10-17 湖南科技学院 Wireless remote control device with low-voltage alarm circuit
CN202979276U (en) * 2013-01-08 2013-06-05 李秉哲 Low-voltage frequency modulation wireless microphone
CN203775372U (en) * 2013-12-29 2014-08-13 李彬 Touch wireless microphone with electric quantity display

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1846456A (en) * 2003-07-10 2006-10-11 Toa株式会社 Transmitter of wireless microphone, receiver for wireless microphone, mobile information communication apparatus, and communication system for wireless microphone
JP2007159194A (en) * 2005-12-01 2007-06-21 Audio Technica Corp Wireless transmitter
CN201732118U (en) * 2010-07-19 2011-02-02 深圳市富业达实业发展有限公司 Computer wireless product low-pressure alarm
CN202495147U (en) * 2012-03-13 2012-10-17 湖南科技学院 Wireless remote control device with low-voltage alarm circuit
CN202979276U (en) * 2013-01-08 2013-06-05 李秉哲 Low-voltage frequency modulation wireless microphone
CN203775372U (en) * 2013-12-29 2014-08-13 李彬 Touch wireless microphone with electric quantity display

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
刘晓飞: "《录音电子技术基础》", 31 August 2015 *
姜世芬: "《传声器电路原理与实践》", 30 April 2012 *

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C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
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Application publication date: 20170222