CN102123339A - Hearing-aid made of TDA2822M - Google Patents
Hearing-aid made of TDA2822M Download PDFInfo
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- CN102123339A CN102123339A CN2011100827862A CN201110082786A CN102123339A CN 102123339 A CN102123339 A CN 102123339A CN 2011100827862 A CN2011100827862 A CN 2011100827862A CN 201110082786 A CN201110082786 A CN 201110082786A CN 102123339 A CN102123339 A CN 102123339A
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Abstract
The invention belongs to the technical field of electronics and audio amplification, and relates to a hearing-aid made of a TDA2822 (Tunnel Diode Amplifier). The hearing-aid comprises a direct current (DC) power supply, a power supply filter circuit, a constant current source and pickup circuit, an emitter follower, an audio signal regulating circuit and an integrated power amplification circuit. The hearing-aid is characterized in that the constant current source and pickup circuit is used as a power supply of a capacitor microphone (MIC), the emitter follower is used as a high-resistance amplification circuit, and the type of the integrated power amplification circuit (IC1) in a BTL (Bridge-Tied-load) mode application circuit is TDA2822M. The hearing-aid provided by the invention is formed by combining discrete components and the integrated power amplification circuit. The hearing-aid has the characteristics of simple circuit structure, fewer peripheral elements, little cross distortion, good tone quality, wide working voltage range, less static current and electricity consumption, output power capable of meeting the requirements on people with poor hearing, and the like, and is a hearing-aid attractive in price and quality, thereby solving or overcoming the problems of partial defects existing in some hearing-aids on the market, and the like.
Description
Technical field
The invention belongs to electronics and audio frequency amplifying technique field, is the hearing aids of making of TDA2822M about a kind of.
Background technology
How general hearing aids is made of special-purpose integrated amplifier circuit design, and the integrated circuit peripheral cell in its circuit is more, and circuit structure is comparatively complicated.The used TDA2822M integrated amplifier circuit of making of TDA2822M of hearing aids of the present invention, it is commonly used on the stereo sets such as rate of doing work amplification in walkman, portable microminiature radio-cassette player, the computer stereo, DVD; This integrated circuit 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 the little little power consumption of quiescent current, characteristics such as cross distortion is little and tonequality is good, the hearing aids that the present invention makes of TDA2822M has that circuit is simple, power output satisfies the requirement that the sense of hearing has the obstacle people fully, solved or remedied the problems such as part shortcoming that some hearing aids on the market exists.
Below describe this hearing aids of making of TDA2822M in detail and make related relevant technologies content.
Summary of the invention
Goal of the invention and beneficial effect: the hearing aids of making of TDA2822M of the present invention adopts discrete component and integrated amplifier combination of circuits to form.This hearing aids has that circuit structure is simple, peripheral cell is few, cross distortion is little, tonequality is good and operating voltage range is wide, the little little power consumption of quiescent current, power output can satisfy the characteristics such as requirement that the sense of hearing has the obstacle people, be a kind of cheap and good-quality hearing aids, solved or remedied the problems such as part shortcoming of some hearing aids existence on the market.
Technical scheme: form by DC power supply DC, electric source filter circuit, constant-current source and pickup circuit, emitter follower, audio signal regulating circuit and integrated amplifier circuit with the hearing aids that TDA2822M makes, it is characterized in that: constant-current source circuit is as the power supply of capacitor microphone MIC, emitter follower is the high resistant amplifying circuit, and the model of the integrated amplifier IC circuit 1 in the BTL mode amplifying circuit is TDA2822M.
Connection features in the composition of each several part circuit and the circuit between the components and parts
The feature of constant-current source and pickup circuit is: be connected on the input of capacitor microphone MIC and the collector electrode of silicon transistor BG1, the base stage of silicon transistor BG2 behind the base stage series resistor R1 of silicon transistor BG1, the shell connection circuit ground GND of capacitor microphone MIC, the emitter of silicon transistor BG1 meets the anodal VCC of DC power supply DC.
The feature of emitter follower is: the base stage of silicon transistor BG2 connects the collector electrode of silicon transistor BG1, the collector electrode of silicon transistor BG2 meets the anodal VCC of DC power supply DC, the end of the emitter connecting resistance R2 of silicon transistor BG2, the other end connection circuit ground GND of resistance R 2.
The feature of audio signal regulating circuit is: electrochemical capacitor C1 negative pole connects the emitter of silicon transistor BG2, connection circuit ground GND behind the anodal serial connection of the electrochemical capacitor C1 potentiometer RP, 7 pin of the movable knee-joint integrated amplifier IC circuit 1 of potentiometer RP.
The feature of BTL mode amplifying circuit is: 7 pin of integrated amplifier IC circuit 1 connect the lever arm of potentiometer RP, 8 pin of integrated amplifier IC circuit 1 connect the positive pole of electrochemical capacitor C3,5 pin of integrated amplifier IC circuit 1 connect the negative pole of electrochemical capacitor C3 and an end of capacitor C 4, the other end connection circuit ground GND of capacitor C 4,6 pin of integrated amplifier IC circuit 1 and 4 pin connection circuit ground GND, 2 pin of integrated amplifier IC circuit 1 meet the anodal VCC of DC power supply DC, 1 pin of integrated amplifier IC circuit 1 connects an end of capacitor C 5 and the end of insert earphone SY, and 3 pin of integrated amplifier IC circuit 1 connect the other end of capacitor C 5 and the other end of insert earphone SY.
The circuit working principle: silicon transistor BG1, resistance R 1 are formed constant-current source circuit to capacitor microphone MIC power supply in the accompanying drawing, and silicon transistor BG2 and resistance R 2 are connected into emitter follower, adopt this circuit can improve the tonequality of capacitor microphone MIC.Be connected into typical single channel BTL mode amplifying circuit with a TDA2822M integrated amplifier IC circuit 1, peripheral cell has only a resistance and two electric capacity, and radiator need not be installed, and the effect that amplifies and tonequality are all satisfactory.Because integrated amplifier IC circuit 1 is directly coupling, so the signal of input can not be with flip-flop, in order to prevent that flip-flop is arranged in the input audio signal, electrochemical capacitor C2 of input serial connection in integrated amplifier IC circuit 1 is used for stopping direct current, flow through insert earphone otherwise will have very big direct current, make it to generate heat or burn.Capacitor C 5 is to establish for the tonequality of improving audio signal, and for further guaranteeing the output quality of audio signal, sound-reducing should be selected the high resistant insert earphone for use.
Description of drawings
Accompanying drawing is to the invention provides an embodiment circuit working schematic diagram with the hearing aids of TDA2822M making.For reducing the interference of electromagnetic signal, require the shell connection circuit ground GND of capacitor microphone MIC.
Embodiment
Implement according to the circuit working schematic diagram of the hearing aids of making of TDA2822M shown in the accompanying drawing and the components and parts specification requirement of description of drawings and the following stated, can realize the present invention.
The selection of components and parts and technical parameter thereof
IC1 is the integrated amplifier circuit, and model is TDA2822, and it has two kinds of packing forms, TDA2822 is 16 pin dip structures, TDA2822M is 8 pin dual in-line package structures, and both inner equivalent electric circuits are identical, and what select for use in the embodiment of the invention is the TDA2822M integrated circuit; Their difference is: the operating voltage range of TDA2822M from 3～15V all can, and the maximum operating voltage of TDA2822 integrated circuit has only 8V;
Silicon transistor BG1 selects models such as 2SC9012 for use, and silicon transistor BG2 selects models such as 2SC9014 for use, requires two transistorized multiplication factor β 〉=120;
Resistance uses RTX-1/16W type metalfilmresistor, the resistance 100K Ω of resistance R 1, the resistance 1K Ω of resistance R 2; RP selects solid potentiometer for use, and its resistance is 22K Ω;
C1～C3 selects the withstand voltage electrochemical capacitor of 16V that is, capacity is respectively 10 μ F, 470 μ F, 10 μ F;
C4, C5 select electric capacity of the dacron for use, and its capacity is respectively 0.01 μ F, 0.047 μ F;
MIC is a capacitor microphone, selects the electret capacitor microphone of two lead-out terminals for use, the shell connection circuit ground GND of capacitor microphone MIC;
SY is an insert earphone, selects the moving-coil type insert earphone for use, and the impedance of insert earphone is 16 Ω, notes selecting for use the impedance of insert earphone more little, and the power of audio frequency output is big more, but tonequality is slightly influential.
Circuit production and debugging
Hearing aids with the TDA2822M making, because of sound output little, the heat radiation of integrated amplifier IC circuit 1 can be by widening the PCB wiring board Copper Foil lead-in wire and the size of pad, the pin that utilizes integrated amplifier IC circuit 1 is directly gone between by the Copper Foil of PCB wiring board and pad dispels the heat.When volume was opened to maximum, the appearance of plastic packaged integrated circuit TDA2822M had only some tepors, and radiating effect is pretty good.
It is errorless on inspection after circuit welds, at first do not connect insert earphone, hearing aid circuit connects the 3V DC power supply, the lever arm of potentiometer RP rotates to the position of volume maximum, please another assistant talk or playing back music, the above audio voltage of 0.2V should be arranged between output 1 pin of integrated circuit TDA2822M and 3 pin facing to capacitor microphone MIC; Output at integrated circuit TDA2822M connects insert earphone then, and insert earphone should send bigger sound; The resistance that changes resistance R 1 can make tonequality reach best.
The present invention is through the old men's use, and practical application effect is fine, and not only sound is loud and clear, clear, can clearly hear thin and delicate sound at a distance, and the stable performance that works long hours.
Claims (5)
1. a hearing aids of making of TDA2822M is made up of DC power supply DC, electric source filter circuit, constant-current source and pickup circuit, emitter follower, audio signal regulating circuit and integrated amplifier circuit, it is characterized in that: constant-current source circuit is as the power supply of capacitor microphone MIC, emitter follower is the high resistant amplifying circuit, and the model of the integrated amplifier IC circuit 1 in the BTL mode amplifying circuit is TDA2822M.
2. the hearing aids of making of TDA2822M according to claim 1, the feature of constant-current source and pickup circuit is: be connected on the input of capacitor microphone MIC and the collector electrode of silicon transistor BG1, the base stage of silicon transistor BG2 behind the base stage series resistor R1 of silicon transistor BG1, the shell connection circuit ground GND of capacitor microphone MIC, the emitter of silicon transistor BG1 meets the anodal VCC of DC power supply DC.
3. the hearing aids of making of TDA2822M according to claim 1, the feature of emitter follower is: the base stage of silicon transistor BG2 connects the collector electrode of silicon transistor BG1, the collector electrode of silicon transistor BG2 meets the anodal VCC of DC power supply DC, the end of the emitter connecting resistance R2 of silicon transistor BG2, the other end connection circuit ground GND of resistance R 2.
4. the hearing aids of making of TDA2822M according to claim 1, the feature of audio signal regulating circuit is: electrochemical capacitor C1 negative pole connects the emitter of silicon transistor BG2, connection circuit ground GND behind the anodal serial connection of the electrochemical capacitor C1 potentiometer RP, 7 pin of the movable knee-joint integrated amplifier IC circuit 1 of potentiometer RP.
5. the hearing aids of making of TDA2822M according to claim 1, the feature of BTL mode amplifying circuit is: 7 pin of integrated amplifier IC circuit 1 connect the lever arm of potentiometer RP, 8 pin of integrated amplifier IC circuit 1 connect the positive pole of electrochemical capacitor C3,5 pin of integrated amplifier IC circuit 1 connect the negative pole of electrochemical capacitor C3 and an end of capacitor C 4, the other end connection circuit ground GND of capacitor C 4,6 pin of integrated amplifier IC circuit 1 and 4 pin connection circuit ground GND, 2 pin of integrated amplifier IC circuit 1 meet the anodal VCC of DC power supply DC, 1 pin of integrated amplifier IC circuit 1 connects an end of capacitor C 5 and the end of insert earphone SY, and 3 pin of integrated amplifier IC circuit 1 connect the other end of capacitor C 5 and the other end of insert earphone SY.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100827862A CN102123339A (en) | 2011-04-01 | 2011-04-01 | Hearing-aid made of TDA2822M |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100827862A CN102123339A (en) | 2011-04-01 | 2011-04-01 | Hearing-aid made of TDA2822M |
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| Publication Number | Publication Date |
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| CN102123339A true CN102123339A (en) | 2011-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100827862A Pending CN102123339A (en) | 2011-04-01 | 2011-04-01 | Hearing-aid made of TDA2822M |
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| CN (1) | CN102123339A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427574A (en) * | 2011-12-05 | 2012-04-25 | 洪珍 | Hearing aid made from monolithic integrated circuit |
| CN103096231A (en) * | 2013-02-16 | 2013-05-08 | 吴建堂 | High loudness electronic hearing aid |
| CN105848055A (en) * | 2016-03-29 | 2016-08-10 | 华南理工大学 | Microphone circuit used for electronic stethoscope |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2086481U (en) * | 1991-02-06 | 1991-10-09 | 黄河 | Communication tourist guide device |
| CN2386998Y (en) * | 1995-12-30 | 2000-07-12 | 董长潇 | Automobile multifunctional warner |
-
2011
- 2011-04-01 CN CN2011100827862A patent/CN102123339A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2086481U (en) * | 1991-02-06 | 1991-10-09 | 黄河 | Communication tourist guide device |
| CN2386998Y (en) * | 1995-12-30 | 2000-07-12 | 董长潇 | Automobile multifunctional warner |
Non-Patent Citations (2)
| Title |
|---|
| 张延琪: "《常用电子电路280例解析》", 31 December 2004, article "例112.另一款耳聋助听器电路", pages: 162-164 * |
| 王慧玲: "《电子技术实验—低频、高频、数字、集成》", 31 December 2004, 机械工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427574A (en) * | 2011-12-05 | 2012-04-25 | 洪珍 | Hearing aid made from monolithic integrated circuit |
| CN103096231A (en) * | 2013-02-16 | 2013-05-08 | 吴建堂 | High loudness electronic hearing aid |
| CN105848055A (en) * | 2016-03-29 | 2016-08-10 | 华南理工大学 | Microphone circuit used for electronic stethoscope |
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Application publication date: 20110713 |
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