CN203136160U - High-loudness electronic audiphone - Google Patents
High-loudness electronic audiphone Download PDFInfo
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- CN203136160U CN203136160U CN 201320073273 CN201320073273U CN203136160U CN 203136160 U CN203136160 U CN 203136160U CN 201320073273 CN201320073273 CN 201320073273 CN 201320073273 U CN201320073273 U CN 201320073273U CN 203136160 U CN203136160 U CN 203136160U
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Abstract
The utility model provides a high-loudness electronic audiphone comprising a 3-V DC power supply, a pickup circuit and audio front amplification circuit, an audio-signal adjusting circuit and a BTL mode amplification circuit. The audiphone is characterized in that a model of an audio amplifier chip IC1 in the BTL mode amplification circuit is TDA2822M. The audio amplifier chip used by the high-loudness electronic audiphone provided by the utility model is usually used for power amplification in sound devices such as walkmans, portable minitype cassette recorders, computer sound devices and DVDs. The audio amplifier chip has the characteristics of high integrated level, few peripheral components, wide work voltage scope, small static current, little electricity consumption and good timbre and can normally operate when voltage is below 1.8 V. The high-loudness electronic audiphone provided by the utility model has a simple circuit, output power completely satisfies requirements of people suffering from hearing disturbance and drawback in some audiphones in a market is made up.
Description
Technical field
The utility model belongs to electronic technology and audio frequency amplifying technique field, is about a kind of high loudness electronic hearing aid.
Background technology
How the brand hearing aids is made of special-purpose integrated amplifier circuit design, and the integrated circuit peripheral cell in the circuit is more, and circuit structure is comparatively complicated.The audio frequency amplifier chip (TDA2822M) that high loudness electronic hearing aid described in the utility model is used, it is commonly used in rate of doing work amplification in stereo set, the computer stereos such as walkman, portable microminiature radio-cassette player, DVD; The audio-frequency power amplifier chip has the integrated level height, peripheral cell is few and operating voltage range is wide, still can operate as normal when voltage is lower than 1.8V, have that quiescent current is little, characteristics such as little power consumption, tonequality are good.High loudness electronic hearing aid described in the utility model has that circuit is simple, power output satisfies the requirement that the sense of hearing has the obstacle people fully, has remedied the problems such as some shortcoming that some hearing aids exists on the market.
Below describe high loudness electronic hearing aid described in the utility model related relevant technologies content in implementation process in detail.
The utility model content
Goal of the invention and beneficial effect: how the brand hearing aids is made of special-purpose integrated amplifier circuit design, and the integrated circuit peripheral cell in the circuit is more, and circuit structure is comparatively complicated.The audio frequency amplifier chip (TDA2822M) that high loudness electronic hearing aid described in the utility model is used, it is commonly used in rate of doing work amplification in stereo set, the computer stereos such as walkman, portable microminiature radio-cassette player, DVD; The audio-frequency power amplifier chip has the integrated level height, peripheral cell is few and operating voltage range is wide, still can operate as normal when voltage is lower than 1.8V, have that quiescent current is little, characteristics such as little power consumption, tonequality are good.High loudness electronic hearing aid described in the utility model has that circuit is simple, power output satisfies the requirement that the sense of hearing has the obstacle people fully, has remedied the problems such as some shortcoming that some hearing aids exists on the market.
The circuit working principle: high loudness electronic hearing aid adopts 2 joint 1.5V No.5 cell power supplies, is easy to carry very much.Voice signal by Electret condenser microphone MIC picks up constitutes the audio frequency pre-amplification circuit by NPN transistor BG1 and relevant components and parts thereof, and moving back through electrochemical capacitor C3 provides working power for the audio frequency pre-amplification circuit after idol is fallen mixed and disorderly composition in the 3V DC power supply.Resistance R 1 can reach operate as normal for Electret condenser microphone MIC internal circuit provides appropriate bias voltage.Audio frequency pre-amplification circuit output audio signal is delivered to audio-frequency power amplifier through electrochemical capacitor C2 and volume control potentiometer RP.This audio-frequency power amplifier is by audio frequency amplifier chip IC 1(DTA2822M) and around components and parts constitute.This audio frequency amplifier chip is portable, small-power electrical equipment and specialized designs, and it adopts 8 pin dual inline type DIP encapsulation.The output of amplifier is connected into BTL mode amplifying circuit in the audio frequency amplifier chip, and it can directly drive 32 Ω monophony high resistant earphones, and capacitor C 6 is for improving the tonequality of audio signal, for guaranteeing the output quality of audio signal.The sound output of high loudness electronic hearing aid circuit is 1W, static working current≤1mA.
Technical scheme: high loudness electronic hearing aid, it comprises 3V DC power supply, pickup circuit and audio frequency pre-amplification circuit, audio signal regulating circuit, BTL mode amplifying circuit, it is characterized in that:
Pickup circuit and audio frequency pre-amplification circuit: it is by Electret condenser microphone MIC, resistance R 1, coupling capacitance C1, NPN transistor BG1, negative feedback resistor R2, load resistance R3 with exchange negative feedback resistor R4 and form, the end of the output connecting resistance R1 of Electret condenser microphone MIC and the end of coupling capacitance C1, the anodal VCC of the other end connection circuit of resistance R 1, the shell end connection circuit ground GND of Electret condenser microphone MIC, the base stage of the termination NPN transistor BG1 of the other end of coupling capacitance C1 and negative feedback resistor R2, the collector electrode of NPN transistor BG1 connects the other end of negative feedback resistor R2 and the end of load resistance R3, the anodal VCC of the other end connection circuit of load resistance R3, the emitter of NPN transistor BG1 is by exchanging negative feedback resistor R4 connection circuit ground GND;
The audio signal regulating circuit: the positive pole of electrochemical capacitor C1 connects the collector electrode of NPN transistor BG1, the movable end of the negative pole wiring potentiometer RP of electrochemical capacitor C1, the 7th pin of the ending connecting audio amplifier chip IC1 of linear potentiometer RP, the other end connection circuit ground GND of linear potentiometer RP;
BTL mode amplifying circuit: the model that audio frequency amplifier chip IC 1 is used is TDA2822M, the 8th pin of audio frequency amplifier chip IC 1 connects the positive pole of electrochemical capacitor C4,5 pin of audio frequency amplifier chip IC 1 connect the negative pole of electrochemical capacitor C4 and an end of capacitor C 5, the other end connection circuit ground GND of capacitor C 5, the anodal VCC of the 2nd pin connection circuit of audio frequency amplifier chip IC 1, the 4th pin of audio frequency amplifier chip IC 1 and the 6th pin connection circuit ground GND, the 1st pin of audio frequency amplifier chip IC 1 connects an end of capacitor C 6 and the end of insert earphone EP, and the 3rd pin of audio frequency amplifier chip IC 1 connects the other end of capacitor C 6 and the other end of insert earphone EP;
The 3V dc power anode links to each other with circuit anode VCC, and the 3V dc power cathode links to each other with circuit ground GND.
Description of drawings
Embodiment
According to high loudness electronic hearing aid circuit working schematic diagram and the description of drawings shown in the accompanying drawing 1, and according to annexation between the components and parts in the described each several part circuit of utility model content, and the components and parts technical parameter described in the execution mode requires and the circuit production main points are implemented to realize the utility model, below in conjunction with embodiment correlation technique of the present utility model is further described.
The selection of components and parts and technical parameter
The model of audio frequency amplifier chip IC 1 is that TDA2822M is 8 pin dual in-line package structures, and what select for use among the utility model embodiment is the TDA2822M integrated circuit;
NPN transistor BG1 selects models such as 2SC9014 for use, requires its multiplication factor β 〉=120;
Resistance uses RTX-1/16W type metalfilmresistor, resistance 2.2K Ω, the resistance 330K Ω of resistance R 2 of resistance R 1, resistance 680 Ω of resistance R 3, resistance 33 Ω of resistance R 4; RP selects linear potentiometer for use, and its resistance is 12K Ω;
The capacity that capacitor C 1, capacitor C 5 are selected for use is 0.01 μ F;
The capacity that electrochemical capacitor C3, electrochemical capacitor C4 select for use is respectively 470 μ F/10V, 10 μ F/10V;
MIC is Electret condenser microphone, selects the Electret condenser microphone of two lead-out terminals for use, the shell connection circuit ground GND of Electret condenser microphone MIC;
EP is insert earphone, selects the moving-coil type insert earphone for use, and its impedance is 32～40 Ω, notes selecting for use the impedance of insert earphone more little, and sound output is just more big, but tonequality slightly descends.
Circuit production main points and circuit debugging
High loudness electronic hearing aid, because of sound output little, the heat radiation of audio frequency amplifier chip IC 1 can be by widening the PCB wiring board Copper Foil lead-in wire and the size of pad, the pin that utilizes audio frequency amplifier chip IC 1 is directly gone between by the Copper Foil of PCB wiring board and pad dispels the heat; When volume is opened to maximum, audio frequency amplifier chip IC 1(TDA2822M) plastic packaging appearance has only some tepors;
Circuit welds by checking errorless, at first without the lug machine, hearing aid circuit connects the 3V DC power supply, the movable end of linear potentiometer RP rotates to the position of volume maximum, allow the assistant face toward Electret condenser microphone MIC speech or broadcast music, the above audio voltage of 0.2V should be arranged between output the 1st pin of audio frequency amplifier chip IC 1 and the 3rd pin;
Then the output in audio frequency amplifier chip IC 1 connects earphone, and earphone should send bigger sound; The resistance that changes resistance R 1 can make tonequality reach best;
The utility model not only sound is loud and clear, clear, and can clearly hear the thin and delicate sound that sends at a distance.
Claims (1)
1. one kind high loudness electronic hearing aid, it comprises 3V DC power supply, pickup circuit and audio frequency pre-amplification circuit, audio signal regulating circuit, BTL mode amplifying circuit, it is characterized in that:
Described pickup circuit and audio frequency pre-amplification circuit are by Electret condenser microphone MIC, resistance R 1, coupling capacitance C1, NPN transistor BG1, negative feedback resistor R2, load resistance R3 with exchange negative feedback resistor R4 and form, the end of the output connecting resistance R1 of Electret condenser microphone MIC and the end of coupling capacitance C1, the anodal VCC of the other end connection circuit of resistance R 1, the shell end connection circuit ground GND of Electret condenser microphone MIC, the base stage of the termination NPN transistor BG1 of the other end of coupling capacitance C1 and negative feedback resistor R2, the collector electrode of NPN transistor BG1 connects the other end of negative feedback resistor R2 and the end of load resistance R3, the anodal VCC of the other end connection circuit of load resistance R3, the emitter of NPN transistor BG1 is by exchanging negative feedback resistor R4 connection circuit ground GND;
The positive pole of electrochemical capacitor C1 connects the collector electrode of NPN transistor BG1 in the described audio signal regulating circuit, the movable end of the negative pole wiring potentiometer RP of electrochemical capacitor C1, the 7th pin of the ending connecting audio amplifier chip IC1 of linear potentiometer RP, the other end connection circuit ground GND of linear potentiometer RP;
The model that audio frequency amplifier chip IC 1 in the described BTL mode amplifying circuit is used is TDA2822M, the 8th pin of audio frequency amplifier chip IC 1 connects the positive pole of electrochemical capacitor C4,5 pin of audio frequency amplifier chip IC 1 connect the negative pole of electrochemical capacitor C4 and an end of capacitor C 5, the other end connection circuit ground GND of capacitor C 5, the anodal VCC of the 2nd pin connection circuit of audio frequency amplifier chip IC 1, the 4th pin of audio frequency amplifier chip IC 1 and the 6th pin connection circuit ground GND, the 1st pin of audio frequency amplifier chip IC 1 connects an end of capacitor C 6 and the end of insert earphone EP, and the 3rd pin of audio frequency amplifier chip IC 1 connects the other end of capacitor C 6 and the other end of insert earphone EP;
Described 3V dc power anode links to each other with circuit anode VCC, and the 3V dc power cathode links to each other with circuit ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320073273 CN203136160U (en) | 2013-02-16 | 2013-02-16 | High-loudness electronic audiphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320073273 CN203136160U (en) | 2013-02-16 | 2013-02-16 | High-loudness electronic audiphone |
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| Publication Number | Publication Date |
|---|---|
| CN203136160U true CN203136160U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320073273 Expired - Fee Related CN203136160U (en) | 2013-02-16 | 2013-02-16 | High-loudness electronic audiphone |
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| Country | Link |
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| CN (1) | CN203136160U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103096231A (en) * | 2013-02-16 | 2013-05-08 | 吴建堂 | High loudness electronic hearing aid |
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2013
- 2013-02-16 CN CN 201320073273 patent/CN203136160U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103096231A (en) * | 2013-02-16 | 2013-05-08 | 吴建堂 | High loudness electronic hearing aid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20140216 |