CN107241676A - A kind of loudspeaker power amplifier test device - Google Patents
A kind of loudspeaker power amplifier test device Download PDFInfo
- Publication number
- CN107241676A CN107241676A CN201710451328.9A CN201710451328A CN107241676A CN 107241676 A CN107241676 A CN 107241676A CN 201710451328 A CN201710451328 A CN 201710451328A CN 107241676 A CN107241676 A CN 107241676A
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- filter capacitor
- loudspeaker
- power amplifier
- audio
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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
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of loudspeaker power amplifier test device, including power supply adaptor, test board and two loudspeaker, the test board uses model CD1517CP audio-frequency power amplifier, for the audio signal of the left and right acoustic channels of set top box to be amplified, the power supply adaptor is used to export 12V DC voltages and power supply is connected with test board, described two loudspeaker are connected by contact pin with test board respectively, the transparent cover that the loudspeaker have speaker body and are hermetically placed in speaker body, foam is provided between the transparent cover and speaker body, this device can save the time 1.5S of the V left and right acoustic channels switching listening of every set top box, calculated by production capacity 310/h, per hour can many outputs 40, part type sound is too small, but pass through and use the device, it can amplify, speaker sound is more loud and clear clear, external environmental interference is small, so as to be not easy erroneous judgement, this installation cost is low.
Description
Technical field
The present invention relates to the power amplifier test circuit plate of power amplifier technology, more particularly to a kind of audio-frequency test field.
Background technology
Existing set top box（STB）Manufacturing enterprise, producing line needs artificial switching right and left sound when testing complete machine left and right acoustic channels
Road is tested and each maintenance 1.5S just can ensure that each sound channel test has sound, and origin operation step is as follows：1st, first by television set list
The root AV tone frequency channel wires insertion AV COBBAIFs of to-be-detected machine, video line insert the AV video interfaces of to-be-detected machine, then by signal wire
On the tuner input interface for inserting to-be-detected machine, selection AV presses determination key；2nd, in program normal play, with single AV audios
Line wheel stream inserts the left and right acoustic channels of to-be-detected machine, checks whether the image of all AV video frequency outputs is normal, it is desirable to which image can not have
Distortion, turn white, the bad phenomenon such as reticulate pattern, mosaic, listen the sound of audio output whether normal, it is desirable to which left and right acoustic channels can not make an uproar
The bad phenomenons such as sound, noise.The method of testing causes to act unnecessary, waste of time, and causes because part type sound is too small
Judge the wrong survey situation of sound.
The content of the invention
The present invention the technical problem to be solved be：A kind of loudspeaker power amplifier test device is provided, cut by hand at present with overcoming
Change caused by the test mode of left and right acoustic channels listening waste of time and part type sound it is too small cause to judge sound it is wrong from
And the technical problem surveyed by mistake.
In order to solve above-mentioned purpose, the technical problem that the present invention takes is：A kind of loudspeaker power amplifier test device, including power supply
Adapter, test board and two loudspeaker, the audio-frequency power amplifier of the test board including model CD1517CP, AV interfaces,
First bleeder circuit unit, the first filter capacitor unit, the second bleeder circuit unit, the second filter capacitor unit, DC socket, insert
Needle stand, first resistor unit, second resistance unit, high-frequency filter capacitor unit, low frequency filtering capacitor cell, the 3rd filter capacitor
The input of unit, the 4th filter capacitor unit and the 5th filter capacitor unit, the AV interfaces and the first bleeder circuit unit
Connection, the output head grounding of the first bleeder circuit unit, the partial pressure output end and first of the first bleeder circuit unit
One end ground connection of filter capacitor unit, the other end of the first filter capacitor unit and the first pin of audio-frequency power amplifier
Connection, the AV interfaces are connected with the input of the second bleeder circuit unit, the output termination of the second bleeder circuit unit
Ground, the partial pressure output end of the second bleeder circuit unit and one end of the second filter capacitor unit are grounded, second filtering
9th pin of the other end of capacitor cell and audio-frequency power amplifier is connected, and two pins of the Plug pin patch bay connect the respectively
It is connected again with the 4th pin of audio-frequency power amplifier and the 6th pin after four filter capacitor units and the 5th filter capacitor unit,
The DC socket is connected with one end of first resistor unit, the other end of the first resistor unit and audio-frequency power amplifier
7th pin, one end of second resistance unit, one end of high-frequency filter capacitor unit, one end of low frequency filtering capacitor cell connect
Connect, the other end of the second resistance unit and the 8th pin of audio-frequency power amplifier are connected, the high-frequency filter capacitor list
The other end of member and the other end ground connection of low frequency filtering capacitor cell, the 3rd pin of the audio-frequency power amplifier is through the 3rd filter
Ripple capacitor cell is grounded, and other pins of the audio-frequency power amplifier are grounded, and the power supply adaptor is straight for exporting 12V
Flow voltage and be connected with DC socket, two pins that described two loudspeaker pass through a contact pin and Plug pin patch bay respectively are connected, the loudspeaker
There is speaker body 1 and the transparent cover 2 that is placed in speaker body 1, set between the transparent cover 2 and speaker body 1
There is foam 3.
Further, including the first LED display circuit unit and the second LED display circuit unit, the first LED is shown
Circuit unit is connected with the input of a loudspeaker and the LED light in the first LED display circuit unit is arranged on the loudspeaker
Transparent cover on, the second LED display circuit unit is connected and the second LED display circuit with the input of another loudspeaker
LED light in unit is arranged on the transparent cover of the loudspeaker.This is characterized in the audio in order to whether be exported in display audio
Exporting the input of then loudspeaker has input voltage, and LED light is bright, and LED light is bright and loudspeaker do not ring, it can be determined that loudspeaker
Quality, so as to determine whether whether the sound of loudspeaker normal, it is to avoid the situation that loudspeaker are tested in spite of illness.
Further, the first bleeder circuit unit is in series by two divider resistances R1 and R2, described second point
Volt circuit unit is in series by two divider resistances R4 and R6.Simple in construction, partial pressure effect is good.
Compared with prior art, the beneficial effects of the invention are as follows：The left and right acoustic channels of tested set top box are inserted into test simultaneously
In AV interfaces in plate, after power amplification, it is output on loudspeaker and drives horns blared, set top box can be judged from the sound of loudspeaker
The quality of left and right acoustic channels, foam can be used for judging whether loudspeaker work, and the V left and right acoustic channels that this device can save every set top box are cut
Change the time 1.5S of listening, calculated by production capacity 310/h, per hour can many outputs 40, part type sound is too small, but passes through
Using the device, can amplify, speaker sound is more loud and clear clear, and external environmental interference is small, so as to be not easy erroneous judgement, this device into
This is low.
Brief description of the drawings
Fig. 1 show the module diagram of the present invention.
Fig. 2 show the structural representation of the loudspeaker in the present invention.
Fig. 3 show a kind of concrete application circuit of the test board in the present invention.
In Fig. 2, speaker body 1, transparent cover 2, foam 3 and LED light.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Embodiment 1 refers to Fig. 1 and Fig. 2, a kind of loudspeaker power amplifier test device, including power supply adaptor, test board and two
Individual loudspeaker, the audio-frequency power amplifier of the test board including model CD1517CP, AV interfaces, the first bleeder circuit unit,
First filter capacitor unit, the second bleeder circuit unit, the second filter capacitor unit, DC socket, Plug pin patch bay, first resistor list
Member, second resistance unit, high-frequency filter capacitor unit, low frequency filtering capacitor cell, the 3rd filter capacitor unit, the 4th filtered electrical
Hold unit and the 5th filter capacitor unit, the AV interfaces are connected with the input of the first bleeder circuit unit, described first point
The output head grounding of volt circuit unit, the partial pressure output end of the first bleeder circuit unit and the one of the first filter capacitor unit
End ground connection, the other end of the first filter capacitor unit and the first pin of audio-frequency power amplifier are connected, the AV interfaces
It is connected with the input of the second bleeder circuit unit, the output head grounding of the second bleeder circuit unit, second partial pressure
The partial pressure output end of circuit unit and one end of the second filter capacitor unit are grounded, the other end of the second filter capacitor unit
Be connected with the 9th pin of audio-frequency power amplifier, two pins of the Plug pin patch bay connect respectively the 4th filter capacitor unit and
It is connected again with the 4th pin of audio-frequency power amplifier and the 6th pin after 5th filter capacitor unit, the DC socket and first
One end connection of resistance unit, the other end of the first resistor unit and the 7th pin of audio-frequency power amplifier, the second electricity
Hinder one end connection of one end, one end of high-frequency filter capacitor unit, low frequency filtering capacitor cell of unit, the second resistance list
The other end of member and the 8th pin of audio-frequency power amplifier are connected, the other end and the low frequency filter of the high-frequency filter capacitor unit
The other end ground connection of ripple capacitor cell, the 3rd pin of the audio-frequency power amplifier is grounded through the 3rd filter capacitor unit, institute
Other pins for stating audio-frequency power amplifier are grounded, and the power supply adaptor is used to export 12V DC voltages and and DC socket
Connection, described two loudspeaker are connected by two pins of a contact pin and Plug pin patch bay respectively, the loudspeaker have speaker body 1 with
And the transparent cover 2 in speaker body 1 is placed on, foam 3 is provided between the transparent cover 2 and speaker body 1, it is preferable that institute
It is granular to state foam shape.
Operation principle：Model CD1517CP audio-frequency power amplifier amplifies for signal, and this chip is applied to 6W loudspeakers
.Power supply adaptor exports 12V direct currents, is carried out by DC socket, first resistor unit to seven pin of audio-frequency power amplifier
Power supply, the resistance value of first resistor unit is zero ohm, plays electrical isolation effect, high-frequency filter capacitor unit filtering 12V electricity
Source high frequency waves, low frequency filtering capacitor cell filtering 12V power supply low frequency waves, 12V direct currents are through first resistor unit, second resistance list
Member is connected in the octal muting control circuit of CD1517CP audio-frequency power amplifier, and second resistance unit is build-out resistor,
Input voltage is more than 11V, and model C D1517CP audio-frequency power amplifier inside MOS is in the conduction state, Audio power amplifier
Device works.
Because audio signal is easily disturbed by mains voltage ripple, the mistake that audio-frequency power amplifier internal signal can be caused to amplify
Occur the situation that signal loses frame in journey, therefore three pins of audio-frequency power amplifier are connected with the 3rd filter capacitor unit, are suppressed
Supply voltage ripple, prevents audio signal from being disturbed by methd of power supply random signal.
In order to ensure maximum, it is necessary to ensure that the input voltage of a pin of audio-frequency power amplifier is more than the volume of input
Built-in voltage (generally a, pin of CD1517CP audio-frequency power amplifiers for one pin of audio-frequency power amplifier
Built-in voltage is 2V), therefore, the audio signal need to improve audio input voltage using the input of carrier wave DC voltage, be tested
The L channel of set top box passes through AV interface tandems the first bleeder circuit unit, the first bleeder circuit unit partial pressure output end output sound
Frequency signal carrier DC voltage 2V, then circulating to exchange by the first filter capacitor unit blocking inputs the audio signal of exchange
To the first pin of CD1517CP audio-frequency power amplifiers.
In order to ensure maximum, it is necessary to ensure that the input voltage of nine pins of audio-frequency power amplifier is more than the volume of input
Built-in voltage (generally, nine pins of CD1517CP audio-frequency power amplifiers of nine pins of audio-frequency power amplifier
Built-in voltage is 2V), therefore, the audio signal need to improve audio input voltage using the input of carrier wave DC voltage, be tested
The R channel of set top box passes through AV interface tandems the second bleeder circuit unit, the second bleeder circuit unit partial pressure output end output sound
AC audio signal, is then input to by frequency signal carrier DC voltage 2V by the circulation exchange of the second filter capacitor unit blocking
9th pin of CD1517CP audio-frequency power amplifiers.
The audible communication signal that amplifying circuit inside the CD1517CP audio-frequency power amplifiers inputs left and right acoustic channels
The 5.5V AC signals for being amplified to 20dB are exported by four pins of CD1517CP audio-frequency power amplifiers and six pins：Four pins
Signal after amplifying for L channel, exports by the 4th filter capacitor unit connected in series, then process Plug pin patch bay and gives 6W loudspeaker, six
Pin is the signal after R channel amplifies, and by the 5th filter capacitor unit connected in series, is exported by Plug pin patch bay and gives 6W loudspeaker.
6W loudspeaker are started working, and the foam of loudspeaker interior sealing starts vibration, and visual inspection illustrates that loudspeaker are started working, clear by the sound of loudspeaker
Clear degree confirms set top box sound channel whether there is noise.
On the basis of above-described embodiment, a kind of loudspeaker power amplifier test device, including the first LED display circuit unit and
Two LED display circuit units, the first LED display circuit unit is connected with the input of a loudspeaker and the first LED is shown
LED light 4 in circuit unit is arranged on the transparent cover 2 of the loudspeaker, the second LED display circuit unit with it is another
LED light 4 in the input connection of individual loudspeaker and the second LED display circuit unit is arranged on the transparent cover 2 of the loudspeaker
On.On the one hand, when audio output, the input of 6W loudspeaker has input voltage, the first LED display circuit unit and second
LED display circuit unit is simultaneously powered, and LED light is bright, if loudspeaker do not ring, it can be determined that the quality of loudspeaker, it is to avoid loudspeaker
Test in case of a fault.On the other hand, when 6W horns blareds, the foam of loudspeaker interior sealing starts vibration, and visual inspection illustrates loudspeaker
Start working, confirm set top box sound channel whether there is noise by the sound articulation of loudspeaker, and the first LED display circuit list can be passed through
Whether member is with the rhythm of the flicker of the LED light in the second LED display circuit unit consistent with brightness to judge left and right acoustic channels
It is whether consistent.The preferred structure of the first LED display circuit unit and the second LED display circuit unit is by a current-limiting resistance
It is in series with a LED.
Specifically, with reference to Fig. 3, the concrete application circuit diagram of test board shown in Fig. 3, in the test board, described first
Bleeder circuit unit is in series by two divider resistances R1 and R2, and the second bleeder circuit unit is by two divider resistance R4
It is in series with R6, the first bleeder circuit unit is in series by two divider resistances R1 and R2, the second partial pressure electricity
Road unit is in series by two divider resistances R4 and R6.The first filter capacitor unit is using patch capacitor C7, and described the
Two filter capacitor units use patch capacitor C1, and the first resistor unit is used using resistance R5, the second resistance unit
Resistance R3, the high-frequency filter capacitor unit uses electrochemical capacitor C6, and low frequency filtering capacitor cell is described using patch capacitor C3
Electrochemical capacitor C2, electrolysis electricity is respectively adopted in 3rd filter capacitor unit, the 4th filter capacitor unit and the 5th filter capacitor unit
Hold C5 and electrochemical capacitor C4, wherein, the parameter of 4 electrochemical capacitors is:C6 470uF/16v；C4 220uF/16v；C5 220uF/
16v；C2 220uF/16v, the parameter of 6 Chip-Rs is:R5 0Ω；R4 100KΩ；R6 10KΩ；R3 10KΩ；R1
10KΩ；R2 100KΩ；The parameter of 3 patch capacitors is:C1 1uF；C7 1uF；C3 0.1uF.The test board low manufacture cost
In 10 yuan, the audio-frequency test of left and right acoustic channels can be carried out simultaneously, every machine save 1.5S switching AV left and right acoustic channels listenings when
Between, calculated by production capacity 310/h, per hour can many outputs 40；Speaker sound is more loud and clear clear, and external environmental interference is small.It is worth
It is noted that the various capacitor cells and resistance unit in test board can be by multiple electric capacity or resistance with different connected mode groups
Into not limited to this physical circuit.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (4)
1. a kind of loudspeaker power amplifier test device, it is characterised in that including power supply adaptor, test board and two loudspeaker, the survey
Test plate (panel) includes model CD1517CP audio-frequency power amplifier, AV interfaces, the first bleeder circuit unit, the first filter capacitor list
Member, the second bleeder circuit unit, the second filter capacitor unit, DC socket, Plug pin patch bay, first resistor unit, second resistance unit,
High-frequency filter capacitor unit, low frequency filtering capacitor cell, the 3rd filter capacitor unit, the 4th filter capacitor unit and the 5th filtering
Capacitor cell, the AV interfaces are connected with the input of the first bleeder circuit unit, the output of the first bleeder circuit unit
End ground connection, the partial pressure output end of the first bleeder circuit unit and one end of the first filter capacitor unit are grounded, and described first
The other end of filter capacitor unit and the first pin of audio-frequency power amplifier are connected, the AV interfaces and the second bleeder circuit list
The input connection of member, the output head grounding of the second bleeder circuit unit, the partial pressure of the second bleeder circuit unit is defeated
Go out end and one end of the second filter capacitor unit to be grounded, the other end and audio-frequency power amplifier of the second filter capacitor unit
The connection of the 9th pin, two pins of the Plug pin patch bay connect the 4th filter capacitor unit and the 5th filter capacitor unit respectively
It is connected again with the 4th pin of audio-frequency power amplifier and the 6th pin afterwards, one end of the DC socket and first resistor unit connects
Connect, the other end of the first resistor unit and the 7th pin, one end of second resistance unit, the high frequency of audio-frequency power amplifier
One end of filter capacitor unit, one end connection of low frequency filtering capacitor cell, the other end and audio of the second resistance unit
The 8th pin connection of power amplifier, the other end of the high-frequency filter capacitor unit and low frequency filtering capacitor cell it is another
End ground connection, the 3rd pin of the audio-frequency power amplifier is grounded through the 3rd filter capacitor unit, the audio-frequency power amplifier
Other pins be grounded, the power supply adaptor be used for export 12V DC voltages and be connected with DC socket, described two loudspeakers
Connected respectively by two pins of contact pin and Plug pin patch bay, the loudspeaker have speaker body and are hermetically placed on loudspeaker
Transparent cover on body, is provided with foam between the transparent cover and speaker body.
2. a kind of loudspeaker power amplifier test device as claimed in claim 1, it is characterised in that including the first LED display circuit list
Member and the second LED display circuit unit, the first LED display circuit unit are connected and first with the input of a loudspeaker
LED light in LED display circuit unit is arranged on the transparent cover of the loudspeaker, the second LED display circuit unit
It is connected with the input of another loudspeaker and the LED light in the second LED display circuit unit is arranged on the transparent of the loudspeaker
Cover is covered.
3. a kind of loudspeaker power amplifier test device as claimed in claim 1, it is characterised in that the first bleeder circuit unit by
Two divider resistances R1 and R2 are in series, and the second bleeder circuit unit is in series by two divider resistances R4 and R6.
4. a kind of loudspeaker power amplifier test device as claimed in claim 1, it is characterised in that the first filter capacitor unit is adopted
Patch capacitor C7 is used, the second filter capacitor unit uses patch capacitor C1, and the first resistor unit uses resistance R5, institute
Second resistance unit is stated using resistance R3, the high-frequency filter capacitor unit uses electrochemical capacitor C6, low frequency filtering capacitor cell
Using patch capacitor C3, the 3rd filter capacitor unit, the 4th filter capacitor unit and the 5th filter capacitor unit are adopted respectively
With electrochemical capacitor C2, electrochemical capacitor C5 and electrochemical capacitor C4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710451328.9A CN107241676A (en) | 2017-06-15 | 2017-06-15 | A kind of loudspeaker power amplifier test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710451328.9A CN107241676A (en) | 2017-06-15 | 2017-06-15 | A kind of loudspeaker power amplifier test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107241676A true CN107241676A (en) | 2017-10-10 |
Family
ID=59987044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710451328.9A Pending CN107241676A (en) | 2017-06-15 | 2017-06-15 | A kind of loudspeaker power amplifier test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107241676A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112102571A (en) * | 2020-09-08 | 2020-12-18 | 福建升腾资讯有限公司 | Alarm device and method for double-horn face brushing terminal |
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Application publication date: 20171010 |