CN106454639A - Low-voltage frequency modulation circuit for wireless earphone - Google Patents
Low-voltage frequency modulation circuit for wireless earphone Download PDFInfo
- 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
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- Prior art keywords
- circuit
- electric capacity
- audion
- low
- voltage
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- 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.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/03—Synergistic effects of band splitting and sub-band processing
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
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
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.
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)
| 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 |
-
2016
- 2016-08-02 CN CN201610621025.2A patent/CN106454639A/en active Pending
Patent Citations (6)
| 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)
| 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170222 |