CN209201159U - A kind of videoconference audio-amplifying circuit - Google Patents
A kind of videoconference audio-amplifying circuit Download PDFInfo
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- CN209201159U CN209201159U CN201822084025.0U CN201822084025U CN209201159U CN 209201159 U CN209201159 U CN 209201159U CN 201822084025 U CN201822084025 U CN 201822084025U CN 209201159 U CN209201159 U CN 209201159U
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- power amplifier
- amplifier chips
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Abstract
The utility model discloses a kind of videoconference audio-amplifying circuit, inductance is connect by the first potentiometer with NPN triode, and NPN triode collector is connect with anode, and the second capacitor is connected in parallel to 3rd resistor both ends；NPN triode collector is connected by 5 feet of the second potentiometer and power amplifier chips, 4 feet of power amplifier chips pass through the 4th resistance, third capacity earth, the connection of 4 feet of the 6th resistance one end and power amplifier chips, the 6th resistance other end is connected by 3 feet of the 6th capacitor and power amplifier chips, the 6th resistance other end passes sequentially through the 5th resistance, the 5th capacity earth, 4th capacitor is connected in parallel to the 6th resistance both ends, and 2 feet of power amplifier chips are grounded by the 7th capacitor, loudspeaker.The utility model has the beneficial effects that call voice is converted to electric signal by inductance, signal amplification is carried out by NPN triode again, power amplifier chips carry out power amplification to amplified signal, to drive the speaker, it is listened to by amplifying call voice for more people, it is ensured that speech quality.
Description
Technical field
The utility model belongs to mobile phone and amplifies technical field, and in particular to a kind of videoconference audio-amplifying circuit.
Background technique
With the continuous development of society and mechanics of communication, telecommunication becomes one of main communication modes, wherein electricity
Words meeting be telecommunication mode one kind, compared with traditional meeting, have meeting schedule it is rapid, without the time,
The features such as domain limits, low-cost.In order to realize communication efficiency, information distortion is avoided, videoconference market is emerging rapidly in recent years
It rises, is widely used in various types of enterprises.
Videoconference usually has one-to-one, one-to-many mode, especially in one-to-many call, due to number compared with
It is more, therefore, it is necessary to carry out the processing that amplifies to the voice in call, to ensure speech quality, therefore, design a kind of videoconference
It is necessary with audio-amplifying circuit.
Utility model content
To overcome technological deficiency of the existing technology, the utility model discloses a kind of videoconference audio-amplifying circuit,
It is listened to by amplifying call voice for more people, it is ensured that speech quality.
Technical solution adopted by the utility model to solve its technical problems is a kind of videoconference audio-amplifying circuits, including
Inductance, battery, first capacitor, the second capacitor, third capacitor, the 4th capacitor, the 5th capacitor, the 6th capacitor, first resistor, second
Resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, NPN triode, the first potentiometer, the second potentiometer and function
Put chip；
Inductance one end is connect with anode, and other end ground connection, first capacitor is connected in parallel to inductance both ends, the first potentiometer
The first solidus end connect with first capacitor one end, the second solidus end of the first potentiometer is connect with the first capacitor other end,
First sliding end of one potentiometer is connect with NPN transistor base, is connected with first between NPN transistor base and its collector
Resistance, NPN triode collector also pass through second resistance and connect with anode, and NPN triode emitter passes through 3rd resistor
Ground connection, the second capacitor are connected in parallel to 3rd resistor both ends；
NPN triode collector is connect with the third solidus end of the second potentiometer, the 4th solidus termination of the second potentiometer
Ground, the second sliding end of the second potentiometer and 5 feet of power amplifier chips connect, and 1 foot of power amplifier chips is connect with anode, power amplifier
4 feet of chip are connect with the 4th resistance one end, and the 4th resistance other end passes through third capacity earth, the 6th resistance one end and power amplifier
4 feet of chip connect, and the 6th resistance other end is connected by 3 feet of the 6th capacitor and power amplifier chips, and the 6th resistance other end is also
Pass sequentially through the 5th resistance, the 5th capacity earth, the 4th capacitor is connected in parallel to the 6th resistance both ends, and 2 feet of power amplifier chips pass through the
Seven capacitors are connect with loudspeaker anode, loudspeaker cathode ground connection, the 6 feet ground connection of power amplifier chips.
It preferably, further include the 8th capacitor and the 9th capacitor, first sliding end of the 8th capacitor one end and the first potentiometer
Connection, the 8th capacitor other end are connect with the NPN transistor base, and the 9th capacitor one end is connect with NPN triode collector,
The 9th capacitor other end is connect with the third solidus end of second potentiometer.
It preferably, further include the tenth capacitor, the tenth capacitor one end is connect with anode, and the other end and battery cathode connect
It connects.
It preferably, further include the 7th resistance, the 7th resistance one end is connect with anode, the other end and the power amplifier core
1 foot of piece connects.
Preferably, the model LM2896 of the power amplifier chips.
It preferably, further include switch, switch one end is connect with anode, switchs the other end and the tenth capacitance connection.
The utility model has the beneficial effects that its structure is simple and at low cost, call voice is converted to by telecommunications by inductance
Number, then signal amplification is carried out by NPN triode, power amplifier chips carry out power amplification to amplified signal, raise to drive
Sound device is listened to by amplifying call voice for more people, it is ensured that speech quality.
Detailed description of the invention
Fig. 1 is a kind of specific embodiment schematic illustration of the utility model.
Fig. 2 is another specific embodiment schematic illustration of the utility model.
Appended drawing reference: L- inductance, U- power amplifier chips, the first potentiometer of RP1-, the second potentiometer of RP2-, the first solidus of A1-
End, the second solidus of A2- end, A3- third solidus end, the 4th solidus end A4-, the first sliding end of B1-, the second sliding end of B2-, Q-
NPN triode, E- battery, C1- first capacitor, the second capacitor of C2-, C3- third capacitor, the 4th capacitor of C4-, the 5th capacitor of C5-,
The 6th capacitor of C6-, the 7th capacitor of C7-, the 8th capacitor of C8-, the 9th capacitor of C9-, the tenth capacitor of C10-, R1- first resistor, R2-
Second resistance, R3- 3rd resistor, the 4th resistance of R4-, the 5th resistance of R5-, the 6th resistance of R6-, the 7th resistance of R7-.
Specific embodiment
More detailed description is done to the embodiments of the present invention below in conjunction with attached drawing and appended drawing reference, makes to be familiar with ability
The technology people in domain can implement accordingly after studying this specification carefully.It should be appreciated that specific embodiment described herein is only to solve
The utility model is released, is not used to limit the utility model.
In the description of the present invention, it should be noted that the orientation of the instructions such as term " on ", "horizontal", "inner" or
Positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing the present invention and simplifying the description,
Rather than the device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation, because
This should not be understood as limiting the present invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in utility model.
Embodiment: referring to attached drawing 1, a kind of attached videoconference audio-amplifying circuit shown in Fig. 2, including inductance L, battery E,
One capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor C4, the 5th capacitor C5, the 6th capacitor C6, first resistor R1,
Two resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, NPN triode Q, the first potentiometer
RP1, the second potentiometer RP2 and power amplifier chips U；
The one end inductance L is connect with battery E anode, and other end ground connection, first capacitor C1 is connected in parallel to the both ends inductance L, and first
The first solidus end A1 of potentiometer RP1 is connect with the one end first capacitor C1, the second solidus end A2 of the first potentiometer RP1 and first
The connection of the capacitor C1 other end, the first sliding end B1 of the first potentiometer RP1 are connect with NPN triode Q base stage, NPN triode Q base
First resistor R1 is connected between pole and its collector, NPN triode Q collector also passes through second resistance R2 and battery E anode
Connection, NPN triode Q emitter are grounded by 3rd resistor R3, and the second capacitor C2 is connected in parallel to the both ends 3rd resistor R3；
NPN triode Q collector is connect with the third solidus end A3 of the second potentiometer RP2, and the 4th of the second potentiometer RP2 the
Solidus end A4 ground connection, the second sliding end B2 of the second potentiometer RP2 connect with 5 feet of power amplifier chips U, 1 foot of power amplifier chips U and
The connection of battery E anode, 4 feet of power amplifier chips U are connect with the 4th one end resistance R4, and the 4th resistance R4 other end passes through third capacitor
C3 ground connection, the 6th one end resistance R6 are connect with 4 feet of power amplifier chips U, and the 6th resistance R6 other end passes through the 6th capacitor C6 and function
The 3 feet connection of chip U is put, the 6th resistance R6 other end also passes sequentially through the 5th resistance R5, the 5th capacitor C5 ground connection, the 4th capacitor
C4 is connected in parallel to the 6th both ends resistance R6, and 2 feet of power amplifier chips U are connect by the 7th capacitor C7 with loudspeaker BL anode, loudspeaker
BL cathode ground connection, the 6 feet ground connection of power amplifier chips U.
In the present embodiment, audio-amplifying circuit is listened to, really by the way that call voice is carried out preposition amplification and power amplification for more people
Protect speech quality.
Specifically, nearby will generate to change with call voice and advise when call voice passes through in earpiece coil
Consistent magnetic field is restrained, therefore, the both ends inductance L will induce the identical voltage signal with changes of magnetic field rule, by the electricity
Pressure signal amplifies processing, then drive the speaker BL work is listened to for more people.L call voice is converted to voltage letter by inductance
Number when, be filtered through first capacitor C1, by the first potentiometer RP1 send to NPN triode Q, first resistor R1, second electricity
In the pre-amplification circuit for hindering R2,3rd resistor R3 and the second capacitor C2 composition, the enhanced processing of voltage signal is realized, through over-discharge
Voltage signal after big carries out power amplification, the letter of the 2 feet output of power amplifier chips U by power amplifier chips U through the second potentiometer RP2
Number by drive the speaker BL sounding.Wherein, the 6th resistance R6 realizes the profound and negative feedbck of power amplifier chips U, to improve sound quality；The
The network that five resistance R5 and the 5th capacitor C5 are constituted is to protect power amplifier chips U and loudspeaker BL；By adjusting the first potentiometer
The resistance value of RP1 and the second potentiometer RP2 realize that the noise of call voice is minimum；Second capacitor C2 is connected in parallel on the both ends 3rd resistor R3
The operating point of NPN triode Q can be stablized；First resistor R1 provides bias voltage for NPN triode Q.
Wherein, the model LM2896 of power amplifier chips U, its feature are that noise is small, and distortion is low, wide using voltage range,
Its supply voltage can select within the scope of 3-9V.
It preferably, further include the 8th capacitor C8 and the 9th capacitor C9, the of the 8th one end capacitor C8 and the first potentiometer RP1
The connection of one sliding end, the 8th capacitor C8 other end are connect with the NPN triode Q base stage, the 9th one end capacitor C9 and tri- pole NPN
The connection of pipe Q collector, the 9th capacitor C9 other end are connect with the third solidus end A3 of the second potentiometer RP2.
In another embodiment, the 8th capacitor C8 and the 9th capacitor C9 is coupled capacitor, in order not to keep rear class electric
The operating point on road is influenced by previous stage, just must by direct current signal by the 8th capacitor C8 and the 9th capacitor C9 by front stage circuits and
Late-class circuit separates, meanwhile, and can enable AC signal is stable to reach in late-class circuit from front stage circuits, make the work of front stage
Make point not interfereing with each other, improves the interference free performance of entire circuit.
It preferably, further include the tenth capacitor C10, the tenth one end capacitor C10 is connect with battery E anode, the other end and electricity
The connection of pond E cathode.
In another embodiment, the tenth capacitor C10 can export battery E voltage stabilization, improve the electricity that entirely amplifies
The interference free performance on road.
Preferably, further include the 7th resistance R7, the 7th one end resistance R7 is connect with battery E anode, the other end with it is described
1 foot of power amplifier chips U connects.
In another embodiment, the 7th resistance R7 is that current-limiting resistance can be used as power amplifier when battery E voltage is high
The protection device of chip U prevents power amplifier chips U to be damaged since battery E voltage is high.
It preferably, further include switch S, the one end switch S is connect with battery E anode, the switch S other end and the tenth capacitor C10
Connection.
In another embodiment, switch S can control the on-off of entire circuit, when videoconference is interrupted, can pass through
Switch S closes the connection of battery E and other devices, reduces the loss of power of battery E.
The above content is the further descriptions made in conjunction with specific preferred embodiment to the utility model, cannot recognize
Determine specific embodiment of the present utility model to be only limited to these instructions.For the common skill of the utility model technical field
For art personnel, the other embodiments obtained in the case where not departing from the technical solution of the utility model be should be included in practical
In novel protection scope.
Claims (6)
1. a kind of videoconference audio-amplifying circuit, it is characterised in that: including inductance, battery, first capacitor, the second capacitor, third
Capacitor, the 4th capacitor, the 5th capacitor, the 6th capacitor, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance,
6th resistance, NPN triode, the first potentiometer, the second potentiometer and power amplifier chips；
Inductance one end is connect with anode, and other end ground connection, first capacitor is connected in parallel to inductance both ends, and the of the first potentiometer
One solidus end is connect with first capacitor one end, and the second solidus end of the first potentiometer is connect with the first capacitor other end, the first electricity
First sliding end of position device is connect with NPN transistor base, and the first electricity is connected between NPN transistor base and its collector
Resistance, NPN triode collector also pass through second resistance and connect with anode, and NPN triode emitter is connect by 3rd resistor
Ground, the second capacitor are connected in parallel to 3rd resistor both ends；
NPN triode collector is connect with the third solidus end of the second potentiometer, the 4th solidus end ground connection of the second potentiometer, the
Second sliding end of two potentiometers and 5 feet of power amplifier chips connect, and 1 foot of power amplifier chips is connect with anode, power amplifier chips
4 feet connect with the 4th resistance one end, the 4th resistance other end pass through third capacity earth, the 6th resistance one end and power amplifier chips
The connection of 4 feet, the 6th resistance other end connected by 3 feet of the 6th capacitor and power amplifier chips, and the 6th resistance other end is also successively
By the 5th resistance, the 5th capacity earth, the 4th capacitor is connected in parallel to the 6th resistance both ends, and 2 feet of power amplifier chips pass through the 7th electricity
Appearance is connect with loudspeaker anode, loudspeaker cathode ground connection, the 6 feet ground connection of power amplifier chips.
2. videoconference audio-amplifying circuit as described in claim 1, it is characterised in that: further include the 8th capacitor and the 9th electricity
Hold, the 8th capacitor one end is connect with the first sliding end of the first potentiometer, the 8th capacitor other end and the NPN transistor base
Connection, the 9th capacitor one end are connect with NPN triode collector, and the third of the 9th capacitor other end and second potentiometer is solid
Line end connection.
3. videoconference audio-amplifying circuit as described in claim 1, it is characterised in that: further include the tenth capacitor, the tenth capacitor
One end is connect with anode, and the other end is connect with battery cathode.
4. videoconference audio-amplifying circuit as described in claim 1, it is characterised in that: further include the 7th resistance, the 7th resistance
One end is connect with anode, and the other end is connect with 1 foot of the power amplifier chips.
5. videoconference audio-amplifying circuit as described in claim 1, it is characterised in that: the model of the power amplifier chips
LM2896。
6. videoconference audio-amplifying circuit as claimed in claim 3, it is characterised in that: further include switch, switch one end and electricity
The connection of pond anode, switchs the other end and the tenth capacitance connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822084025.0U CN209201159U (en) | 2018-12-12 | 2018-12-12 | A kind of videoconference audio-amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822084025.0U CN209201159U (en) | 2018-12-12 | 2018-12-12 | A kind of videoconference audio-amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209201159U true CN209201159U (en) | 2019-08-02 |
Family
ID=67428882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822084025.0U Expired - Fee Related CN209201159U (en) | 2018-12-12 | 2018-12-12 | A kind of videoconference audio-amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209201159U (en) |
-
2018
- 2018-12-12 CN CN201822084025.0U patent/CN209201159U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190802 Termination date: 20211212 |