CN206061107U - It is a kind of to be based on difference output control circuit and audio amplifier - Google Patents
It is a kind of to be based on difference output control circuit and audio amplifier Download PDFInfo
- Publication number
- CN206061107U CN206061107U CN201621048491.8U CN201621048491U CN206061107U CN 206061107 U CN206061107 U CN 206061107U CN 201621048491 U CN201621048491 U CN 201621048491U CN 206061107 U CN206061107 U CN 206061107U
- Authority
- CN
- China
- Prior art keywords
- electric capacity
- amplifier
- resistance
- chip
- amplifier chip
- 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.)
- Withdrawn - After Issue
Links
Landscapes
- Amplifiers (AREA)
Abstract
This utility model belongs to audio amplifier control circuit technical field, more particularly to one kind is based on difference output control circuit and audio amplifier.In this utility model embodiment, Bluetooth chip and power amplifier are included based on difference output control circuit, first amplifier and the second amplifier for also including being sequentially connected in series between the Bluetooth chip and power amplifier based on difference output control circuit, the audio frequency differential signal of the Bluetooth chip output is through the first amplifier and the dual output control of the second amplifier, using the audio amplifier based on difference output control circuit in the performance for not changing difference output while, can effectively control the very low system noise of very little.
Description
Technical field
This utility model belongs to audio amplifier control circuit technical field, more particularly to it is a kind of be based on difference output control circuit and
Audio amplifier.
Background technology
Audio amplifier refers to a kind of equipment that audio signal can be transformed to sound.Speaker main casing or low just refer in popular is said
Power amplifier is carried in sound receiver body, sound is played back out in itself by audio amplifier after process is amplified to audio signal so as to sound
The change of tune is big.
Current speaker products design, has the output of difference audio speaker box and can be given to power amplifier.But it is very low when occurring
Noise when, it is impossible to realization effectively thoroughly control.
Utility model content
The purpose of this utility model embodiment is to provide one kind based on difference output control circuit and audio amplifier, it is intended to solved
Present difference audio speaker box cannot solve the problems, such as low noise.
This utility model embodiment be achieved in that it is a kind of based on difference output control circuit, including Bluetooth chip and
Power amplifier, first amplifier for also including being sequentially connected in series between the Bluetooth chip and power amplifier based on difference output control circuit
With the second amplifier, the audio frequency differential signal of the Bluetooth chip output is through the first amplifier and the dual output control of the second amplifier.
The another object of this utility model embodiment is to provide a kind of audio amplifier, including based on difference output control circuit,
It is described that Bluetooth chip and power amplifier are included based on difference output control circuit, it is described also to be included successively based on difference output control circuit
The first amplifier being connected between the Bluetooth chip and power amplifier and the second amplifier, the audio frequency difference letter of the Bluetooth chip output
Number through the first amplifier and the dual output control of the second amplifier.
In this utility model embodiment, Bluetooth chip and power amplifier are included based on difference output control circuit, it is described to be based on
Difference output control circuit also includes the first amplifier and the second amplifier being sequentially connected in series between the Bluetooth chip and power amplifier, institute
The audio frequency differential signal of Bluetooth chip output is stated through the first amplifier and the dual output control of the second amplifier, employing should be based on difference
The audio amplifier of output control circuit in the performance for not changing difference output while, can effectively control the very low system noise of very little.
Description of the drawings
Fig. 1 is the structure chart based on difference output control circuit that this utility model embodiment is provided.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.It should be appreciated that specific embodiment described herein is only to explain
This utility model, is not used to limit this utility model.
Fig. 1 shows the structure based on difference output control circuit that this utility model embodiment is provided, for the ease of saying
It is bright, illustrate only the part related to this utility model embodiment.
One kind is based on difference output control circuit, including Bluetooth chip 1 and power amplifier 2, described based on difference output control electricity
Road also includes the first amplifier 3 and the second amplifier 4 being sequentially connected in series between the Bluetooth chip 1 and power amplifier 2, the Bluetooth chip
The audio frequency differential signal of 1 output is through 4 dual output control of the first amplifier 3 and the second amplifier.
Used as one embodiment of this utility model, first amplifier 3 includes：
Electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, resistance
R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8 and amplifier chip U1；
The first of the electric capacity C1 terminates the differential signal outputs SPK_L_P of the Bluetooth chip 1, the electric capacity C1's
Second end connects the first negative input end 1IN- of amplifier chip U1, the first positive input of amplifier chip U1 by resistance R1
1IN+ resistance R2 in parallel and electric capacity C4 meet reference voltage DC_PA/2 at end, and the electric capacity C3 is connected to the amplifier chip
Between the first negative input end 1IN- and the first positive input terminal 1IN+ of U1, the first outfan 1OUT of amplifier chip U1 passes through
The resistance R6 connects second amplifier 4, and the electric capacity C7 and resistance R5 is connected in parallel on the first negative input of amplifier chip U1
Between the 1IN- and the first outfan 1OUT of end, the power end VDD of amplifier chip U1 connects reference voltage DC_PA, the amplifier
The ground terminal GND ground connection of chip U1, the electric capacity C9 are connected between the power end VDD of amplifier chip U1 and ground terminal GND；
The first of the electric capacity C2 terminates the differential signal outputs SPK_L_N of the Bluetooth chip 1, the electric capacity C2's
Second end connects the second negative input end 2IN- of amplifier chip U1, the second positive input of amplifier chip U1 by resistance R3
2IN+ resistance R4 in parallel and electric capacity C6 meet reference voltage DC_PA/2 at end, and the electric capacity C5 is connected to the amplifier chip
Between the second negative input end 2IN- and the second positive input terminal 2IN+ of U1, the second outfan 2OUT of amplifier chip U1 passes through
The resistance R8 connects second amplifier 4, and the electric capacity C8 and resistance R7 is connected in parallel on the second negative input of amplifier chip U1
Between the 2IN- and the second outfan 2OUT of end.
Used as one embodiment of this utility model, second amplifier 4 includes：
Electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C13, electric capacity C14, electric capacity C15, electric capacity C16, electric capacity C17, electric capacity
C18, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, resistance R16 and amplifier chip
U2；
The first of the electric capacity C10 terminates the differential signal outputs SPK_L_P, the electric capacity C10 of first amplifier 3
The second end the first negative input end 1IN- of amplifier chip U2 is met by resistance R9, the first of amplifier chip U2 is just defeated
Enter to hold 1IN+ resistance R10 in parallel and electric capacity C13 to meet reference voltage DC_PA/2, the electric capacity C12 is connected to the amplifier
Between the first negative input end 1IN- and the first positive input terminal 1IN+ of chip U2, the first outfan 1OUT of amplifier chip U2
The power amplifier 2 is connect by the resistance R15, it is first negative defeated that the electric capacity C16 and resistance R13 is connected in parallel on amplifier chip U2
Enter to hold between 1IN- and the first outfan 1OUT, the power end VDD of amplifier chip U2 connects reference voltage DC_PA, the fortune
Put chip U2 ground terminal GND ground connection, the electric capacity C18 be connected to amplifier chip U2 power end VDD and ground terminal GND it
Between；
The first of the electric capacity C11 terminates the differential signal outputs SPK_L_N, the electric capacity C11 of first amplifier 3
The second end meet the second negative input end 2IN- of amplifier chip U2 by resistance R11, amplifier chip U2 second just
Input 2IN+ resistance R12 in parallel and electric capacity C15 meet reference voltage DC_PA/2, and the electric capacity C14 is connected to the fortune
Put between the second negative input end 2IN- of chip U2 and the second positive input terminal 2IN+, the second outfan of amplifier chip U2
2OUT connects the power amplifier by the resistance R16, and the electric capacity C17 and resistance R14 are connected in parallel on the second of amplifier chip U2
Between negative input end 2IN- and the second outfan 2OUT.
This utility model embodiment also provides a kind of audio amplifier, including based on difference output control circuit, including Bluetooth chip 1
With power amplifier 2, it is described also include being sequentially connected in series between the Bluetooth chip 1 and power amplifier 2 based on difference output control circuit the
One amplifier 3 and the second amplifier 4, the audio frequency differential signal of the output of the Bluetooth chip 1 is through the first amplifier 3 and the second amplifier 4 pairs
Weight output control.
Used as one embodiment of this utility model, first amplifier 3 includes：
Electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, resistance
R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8 and amplifier chip U1；
The first of the electric capacity C1 terminates the differential signal outputs SPK_L_P of the Bluetooth chip 1, the electric capacity C1's
Second end connects the first negative input end 1IN- of amplifier chip U1, the first positive input of amplifier chip U1 by resistance R1
1IN+ resistance R2 in parallel and electric capacity C4 meet reference voltage DC_PA/2 at end, and the electric capacity C3 is connected to the amplifier chip
Between the first negative input end 1IN- and the first positive input terminal 1IN+ of U1, the first outfan 1OUT of amplifier chip U1 passes through
The resistance R6 connects second amplifier 4, and the electric capacity C7 and resistance R5 is connected in parallel on the first negative input of amplifier chip U1
Between the 1IN- and the first outfan 1OUT of end, the power end VDD of amplifier chip U1 connects reference voltage DC_PA, the amplifier
The ground terminal GND ground connection of chip U1, the electric capacity C9 are connected between the power end VDD of amplifier chip U1 and ground terminal GND；
The first of the electric capacity C2 terminates the differential signal outputs SPK_L_N of the Bluetooth chip 1, the electric capacity C2's
Second end connects the second negative input end 2IN- of amplifier chip U1, the second positive input of amplifier chip U1 by resistance R3
2IN+ resistance R4 in parallel and electric capacity C6 meet reference voltage DC_PA/2 at end, and the electric capacity C5 is connected to the amplifier chip
Between the second negative input end 2IN- and the second positive input terminal 2IN+ of U1, the second outfan 2OUT of amplifier chip U1 passes through
The resistance R8 connects second amplifier 4, and the electric capacity C8 and resistance R7 is connected in parallel on the second negative input of amplifier chip U1
Between the 2IN- and the second outfan 2OUT of end.
Used as one embodiment of this utility model, second amplifier 4 includes：
Electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C13, electric capacity C14, electric capacity C15, electric capacity C16, electric capacity C17, electric capacity
C18, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, resistance R16 and amplifier chip
U2；
The first of the electric capacity C10 terminates the differential signal outputs SPK_L_P, the electric capacity C10 of first amplifier 3
The second end the first negative input end 1IN- of amplifier chip U2 is met by resistance R9, the first of amplifier chip U2 is just defeated
Enter to hold 1IN+ resistance R10 in parallel and electric capacity C13 to meet reference voltage DC_PA/2, the electric capacity C12 is connected to the amplifier
Between the first negative input end 1IN- and the first positive input terminal 1IN+ of chip U2, the first outfan 1OUT of amplifier chip U2
The power amplifier 2 is connect by the resistance R15, it is first negative defeated that the electric capacity C16 and resistance R13 is connected in parallel on amplifier chip U2
Enter to hold between 1IN- and the first outfan 1OUT, the power end VDD of amplifier chip U2 connects reference voltage DC_PA, the fortune
Put chip U2 ground terminal GND ground connection, the electric capacity C18 be connected to amplifier chip U2 power end VDD and ground terminal GND it
Between；
The first of the electric capacity C11 terminates the differential signal outputs SPK_L_N, the electric capacity C11 of first amplifier 3
The second end meet the second negative input end 2IN- of amplifier chip U2 by resistance R11, amplifier chip U2 second just
Input 2IN+ resistance R12 in parallel and electric capacity C15 meet reference voltage DC_PA/2, and the electric capacity C14 is connected to the fortune
Put between the second negative input end 2IN- of chip U2 and the second positive input terminal 2IN+, the second outfan of amplifier chip U2
2OUT connects the power amplifier by the resistance R16, and the electric capacity C17 and resistance R14 are connected in parallel on the second of amplifier chip U2
Between negative input end 2IN- and the second outfan 2OUT.
Operation principle：
1st, audio frequency differential signal exports SPK_L_P and SPK_L_N from Bluetooth chip, through amplifier chip U1, amplifier chip
After U2, then export and be given to power amplifier, finally export to loudspeaker.
2nd, the output of whole audio frequency differential signal is required for being compared output with reference voltage DC_PA/2, while in fortune
Addition electric capacity C7 on the feedback circuit of chip U1, amplifier chip U2 is put, C8, C16, C17 are filtered control audio frequency output
Scope.
In this utility model embodiment, Bluetooth chip and power amplifier are included based on difference output control circuit, it is described to be based on
Difference output control circuit also includes the first amplifier and the second amplifier being sequentially connected in series between the Bluetooth chip and power amplifier, institute
The audio frequency differential signal of Bluetooth chip output is stated through the first amplifier and the dual output control of the second amplifier, employing should be based on difference
The audio amplifier of output control circuit in the performance for not changing difference output while, can effectively control the very low system noise of very little.
Preferred embodiment of the present utility model is the foregoing is only, it is not to limit this utility model, all at this
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in this utility model
Protection domain within.
Claims (6)
1. it is a kind of to be based on difference output control circuit, it is characterised in that including Bluetooth chip and power amplifier, described based on difference output
Control circuit also includes the first amplifier and the second amplifier being sequentially connected in series between the Bluetooth chip and power amplifier, the bluetooth core
The audio frequency differential signal of piece output is through the first amplifier and the dual output control of the second amplifier.
2. difference output control circuit is based on as claimed in claim 1, it is characterised in that first amplifier includes：
Electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, resistance R1, electricity
Resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8 and amplifier chip U1；
The differential signal outputs SPK_L_P of the first termination Bluetooth chip of the electric capacity C1, the second of the electric capacity C1
End connects the first negative input end 1IN- of amplifier chip U1, the first positive input terminal of amplifier chip U1 by resistance R1
1IN+ resistance R2 in parallel and electric capacity C4 meet reference voltage DC_PA/2, and the electric capacity C3 is connected to amplifier chip U1
The first negative input end 1IN- and the first positive input terminal 1IN+ between, the first outfan 1OUT of amplifier chip U1 passes through institute
State resistance R6 and connect second amplifier, the electric capacity C7 and resistance R5 is connected in parallel on the first negative input end of amplifier chip U1
Between 1IN- and the first outfan 1OUT, the power end VDD of amplifier chip U1 connects reference voltage DC_PA, the amplifier core
The ground terminal GND ground connection of piece U1, the electric capacity C9 are connected between the power end VDD of amplifier chip U1 and ground terminal GND；
The differential signal outputs SPK_L_N of the first termination Bluetooth chip of the electric capacity C2, the second of the electric capacity C2
End connects the second negative input end 2IN- of amplifier chip U1, the second positive input terminal of amplifier chip U1 by resistance R3
2IN+ resistance R4 in parallel and electric capacity C6 meet reference voltage DC_PA/2, and the electric capacity C5 is connected to amplifier chip U1
The second negative input end 2IN- and the second positive input terminal 2IN+ between, the second outfan 2OUT of amplifier chip U1 passes through institute
State resistance R8 and connect second amplifier, the electric capacity C8 and resistance R7 is connected in parallel on the second negative input end of amplifier chip U1
Between 2IN- and the second outfan 2OUT.
3. difference output control circuit is based on as claimed in claim 1, it is characterised in that second amplifier includes：
Electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C13, electric capacity C14, electric capacity C15, electric capacity C16, electric capacity C17, electric capacity C18,
Resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, resistance R16 and amplifier chip U2；
The of the differential signal outputs SPK_L_P of first termination first amplifier of the electric capacity C10, the electric capacity C10
Two ends connect the first negative input end 1IN- of amplifier chip U2, the first positive input terminal of amplifier chip U2 by resistance R9
1IN+ resistance R10 in parallel and electric capacity C13 meet reference voltage DC_PA/2, and the electric capacity C12 is connected to the amplifier chip
Between the first negative input end 1IN- and the first positive input terminal 1IN+ of U2, the first outfan 1OUT of amplifier chip U2 passes through
The resistance R15 connects the power amplifier, and the electric capacity C16 and resistance R13 is connected in parallel on the first negative input end of amplifier chip U2
Between 1IN- and the first outfan 1OUT, the power end VDD of amplifier chip U2 connects reference voltage DC_PA, the amplifier core
The ground terminal GND ground connection of piece U2, the electric capacity C18 are connected between the power end VDD of amplifier chip U2 and ground terminal GND；
The of the differential signal outputs SPK_L_N of first termination first amplifier of the electric capacity C11, the electric capacity C11
Two ends connect the second negative input end 2IN- of amplifier chip U2, the second positive input of amplifier chip U2 by resistance R11
2IN+ resistance R12 in parallel and electric capacity C15 meet reference voltage DC_PA/2 at end, and the electric capacity C14 is connected to the amplifier core
Between the second negative input end 2IN- and the second positive input terminal 2IN+ of piece U2, the second outfan 2OUT of amplifier chip U2 leads to
Cross the resistance R16 and connect the power amplifier, the electric capacity C17 and resistance R14 is connected in parallel on the second negative input of amplifier chip U2
Between the 2IN- and the second outfan 2OUT of end.
4. a kind of audio amplifier, it is characterised in that include based on difference output control circuit, it is described based on difference output control circuit bag
Include Bluetooth chip and power amplifier, it is described based on difference output control circuit also include being sequentially connected in series the Bluetooth chip and power amplifier it
Between the first amplifier and the second amplifier, the audio frequency differential signal of Bluetooth chip output is double through the first amplifier and the second amplifier
Weight output control.
5. audio amplifier as claimed in claim 4, it is characterised in that first amplifier includes：
Electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, resistance R1, electricity
Resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8 and amplifier chip U1；
The differential signal outputs SPK_L_P of the first termination Bluetooth chip of the electric capacity C1, the second of the electric capacity C1
End connects the first negative input end 1IN- of amplifier chip U1, the first positive input terminal of amplifier chip U1 by resistance R1
1IN+ resistance R2 in parallel and electric capacity C4 meet reference voltage DC_PA/2, and the electric capacity C3 is connected to amplifier chip U1
The first negative input end 1IN- and the first positive input terminal 1IN+ between, the first outfan 1OUT of amplifier chip U1 passes through institute
State resistance R6 and connect second amplifier, the electric capacity C7 and resistance R5 is connected in parallel on the first negative input end of amplifier chip U1
Between 1IN- and the first outfan 1OUT, the power end VDD of amplifier chip U1 connects reference voltage DC_PA, the amplifier core
The ground terminal GND ground connection of piece U1, the electric capacity C9 are connected between the power end VDD of amplifier chip U1 and ground terminal GND；
The differential signal outputs SPK_L_N of the first termination Bluetooth chip of the electric capacity C2, the second of the electric capacity C2
End connects the second negative input end 2IN- of amplifier chip U1, the second positive input terminal of amplifier chip U1 by resistance R3
2IN+ resistance R4 in parallel and electric capacity C6 meet reference voltage DC_PA/2, and the electric capacity C5 is connected to amplifier chip U1
The second negative input end 2IN- and the second positive input terminal 2IN+ between, the second outfan 2OUT of amplifier chip U1 passes through institute
State resistance R8 and connect second amplifier, the electric capacity C8 and resistance R7 is connected in parallel on the second negative input end of amplifier chip U1
Between 2IN- and the second outfan 2OUT.
6. audio amplifier as claimed in claim 4, it is characterised in that second amplifier includes：
Electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C13, electric capacity C14, electric capacity C15, electric capacity C16, electric capacity C17, electric capacity C18,
Resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, resistance R16 and amplifier chip U2；
The of the differential signal outputs SPK_L_P of first termination first amplifier of the electric capacity C10, the electric capacity C10
Two ends connect the first negative input end 1IN- of amplifier chip U2, the first positive input terminal of amplifier chip U2 by resistance R9
1IN+ resistance R10 in parallel and electric capacity C13 meet reference voltage DC_PA/2, and the electric capacity C12 is connected to the amplifier chip
Between the first negative input end 1IN- and the first positive input terminal 1IN+ of U2, the first outfan 1OUT of amplifier chip U2 passes through
The resistance R15 connects the power amplifier, and the electric capacity C16 and resistance R13 is connected in parallel on the first negative input end of amplifier chip U2
Between 1IN- and the first outfan 1OUT, the power end VDD of amplifier chip U2 connects reference voltage DC_PA, the amplifier core
The ground terminal GND ground connection of piece U2, the electric capacity C18 are connected between the power end VDD of amplifier chip U2 and ground terminal GND；
The of the differential signal outputs SPK_L_N of first termination first amplifier of the electric capacity C11, the electric capacity C11
Two ends connect the second negative input end 2IN- of amplifier chip U2, the second positive input of amplifier chip U2 by resistance R11
2IN+ resistance R12 in parallel and electric capacity C15 meet reference voltage DC_PA/2 at end, and the electric capacity C14 is connected to the amplifier core
Between the second negative input end 2IN- and the second positive input terminal 2IN+ of piece U2, the second outfan 2OUT of amplifier chip U2 leads to
Cross the resistance R16 and connect the power amplifier, the electric capacity C17 and resistance R14 is connected in parallel on the second negative input of amplifier chip U2
Between the 2IN- and the second outfan 2OUT of end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621048491.8U CN206061107U (en) | 2016-09-08 | 2016-09-08 | It is a kind of to be based on difference output control circuit and audio amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621048491.8U CN206061107U (en) | 2016-09-08 | 2016-09-08 | It is a kind of to be based on difference output control circuit and audio amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206061107U true CN206061107U (en) | 2017-03-29 |
Family
ID=58370254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621048491.8U Withdrawn - After Issue CN206061107U (en) | 2016-09-08 | 2016-09-08 | It is a kind of to be based on difference output control circuit and audio amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206061107U (en) |
-
2016
- 2016-09-08 CN CN201621048491.8U patent/CN206061107U/en not_active Withdrawn - After Issue
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104734651A (en) | Circuit for achieving power amplification of shared audios of analog audio source and differential audio source | |
| CN206061107U (en) | It is a kind of to be based on difference output control circuit and audio amplifier | |
| CN203645811U (en) | Novel sound box with foldback function | |
| CN106255005A (en) | A kind of audio frequency ground isolating difference circuit and audio amplifier | |
| CN205265633U (en) | Anti interfering signal magnification system | |
| CN206117993U (en) | Audio frequency ground keeps apart differential circuit and audio amplifier | |
| CN205040009U (en) | Microphone and input circuit that makes an uproar falls thereof | |
| CN204721585U (en) | Receiver amplifier | |
| CN203734825U (en) | Audio signal processing circuit and audio playing device | |
| CN203225871U (en) | Simplified audio frequency amplification circuit | |
| CN107181997A (en) | A kind of audio de-noising circuit and with wheat audio amplifier | |
| CN106231496A (en) | A kind of based on difference output control circuit and audio amplifier | |
| CN203734823U (en) | Audio device | |
| CN203387650U (en) | Novel audio sharing device | |
| CN104300926A (en) | Audio power amplifier used for multimedia electronic equipment | |
| CN206472295U (en) | For eliminating the powered-down rear output POP acoustic-electrics road of sound equipment power amplifier | |
| CN206061109U (en) | A kind of single-ended audio signal turns differential signal circuit and wireless headset | |
| CN204697021U (en) | A kind of multimedia active loundspeakers control circuit | |
| CN204206116U (en) | A kind of audio-frequency power amplifier for multimedia electronic equipment | |
| CN204498073U (en) | A kind of circuit realizing simulation and difference two assonance source sharing audio power amplifier | |
| CN103077566A (en) | Voice-operated electronic doorbell circuit | |
| CN204104105U (en) | A kind of circuit of Earphone Amplifier | |
| CN2612153Y (en) | Combined feedback power amplifier | |
| CN203747979U (en) | Loudspeaker output circuit | |
| CN204272366U (en) | A kind of mini audio |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170329 Effective date of abandoning: 20210319 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20170329 Effective date of abandoning: 20210319 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |