CN102740213A - Discrete component hearing aid - Google Patents
Discrete component hearing aid Download PDFInfo
- Publication number
- CN102740213A CN102740213A CN2012102625959A CN201210262595A CN102740213A CN 102740213 A CN102740213 A CN 102740213A CN 2012102625959 A CN2012102625959 A CN 2012102625959A CN 201210262595 A CN201210262595 A CN 201210262595A CN 102740213 A CN102740213 A CN 102740213A
- Authority
- CN
- China
- Prior art keywords
- circuit
- positive
- resistance
- connection circuit
- negative
- 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- Withdrawn
Links
Images
Landscapes
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a discrete component hearing aid, which is composed of a 3V direct current power supply, a pick-up circuit, a front audio frequency amplifier circuit, a volume adjusting circuit, a secondary audio frequency amplifying and audio power amplifying circuit, and an earphone interface circuit. Most of hearing aids in the market are designed and manufactured by a special integrated power amplifier circuit, so the circuit structures are complicated and the selling prices in the market are high. The discrete component hearing aid disclosed by the invention completely utilizes the discrete component, so the circuit has the advantages that the structure is simple, the peripheral elements are less, the work voltage range is wide, the static current is small, the electricity consumption is less, the distortion degree is small and the tone quality is good. The output power can completely meet the demands of hearing disabled people, so hearing of old people can be improved; the learning and memory of youngsters also can be improved, and the problems that the hearing aids of some brands in the market are high in price and not easy to popularize are solved or compensated.
Description
Technical field
The invention belongs to electronic technology and audio signal amplification sector, is about a kind of separate piece hearing aids.
Background technology
How hearing aids on the market is made with special-purpose integrated amplifier circuit design, and its circuit structure is comparatively complicated, and the market price is more expensive.Very many years ago, because quality and the performance of the positive-negative-positive triode that germanium material is made do not pass a test, in order to obtain signal amplification effect more clearly, so make high-frequency triode that hearing aids often adopts the germanium material making as the audio signal amplifier element.Nowadays the present canot compare with the past already for the quality of element and performance, makes hearing aids and need not the more expensive application-specific integrated circuit (ASIC) of price at all, and it is just feasible fully to select for use discrete component to design and produce hearing aids.
Separate piece hearing aids of the present invention all uses discrete component; Advantages such as that its circuit has is simple in structure, peripheral cell is few, operating voltage range is wide, quiescent current is little, little power consumption, the distortion factor is little and tonequality is good; Power output can satisfy the requirement that the sense of hearing has the obstacle people fully; Can improve the elderly's hearing, also available it improve teen-age learning and memory, solve or remedied on the market brand hearing aids exist price high, problem such as be difficult for popularizing.
Specify separate piece hearing aids of the present invention related relevant technologies content in implementation process below.
Summary of the invention
Goal of the invention and beneficial effect: how the hearing aids on the market is made with special-purpose integrated amplifier circuit design, and its circuit structure is comparatively complicated, and the market price is more expensive.Separate piece hearing aids of the present invention all uses discrete component; Advantages such as that its circuit has is simple in structure, peripheral cell is few, operating voltage range is wide, quiescent current is little, little power consumption, the distortion factor is little and tonequality is good; Power output can satisfy the requirement that the sense of hearing has the obstacle people fully; Can improve the elderly's hearing, also available it improve teen-age learning and memory power, solve or remedied on the market brand hearing aids exist price high, problem such as be difficult for popularizing.
The circuit working principle: the separate piece hearing aids is that Electret condenser microphone MIC converts acoustic signals into audio signal; Audio signal is delivered to preposition low-frequency amplifier circuit through coupling capacitance C3 and is amplified; Resistance R 4 is the adaptive resistance of Electret condenser microphone MIC, for Electret condenser microphone MIC operate as normal provides voltage.
The circuit of separate piece hearing aids is to constitute multistage low frequency amplifier by 3 triode VT1～VT3.NPN type triode VT3, resistance R 3 are formed preposition low-frequency amplifier circuit; The audio signal of coupling capacitance C3 coupling is carried out preposition low frequency amplifies; Audio signal after the amplification is added on the potentiometer RP by electrochemical capacitor C2, and potentiometer RP is used for regulating the volume of earphone.NPN type triode VT2 forms the secondary low-frequency amplifier circuit, and positive-negative-positive triode VT1 forms power amplification circuit, and positive-negative-positive triode VT1 is connected into the emitter output form, and resistance R 1 plays negative feedback, is used for stabilizing circuit and the tonequality of improving audio signal.Audio signal promotes 16 Ω low-resistance earphone sounding through after the power amplification through earphone socket CK.
Technical scheme: the separate piece hearing aids, it is made up of 3V DC power supply, pickup circuit, preposition audio amplifier circuit, volume control circuit, the amplification of secondary audio frequency and audio power amplifying circuit, earphone interface circuit, and its characteristic comprises:
The pickup circuit: the output of Electret condenser microphone MIC links to each other with an end of resistance R 4, the anodal VCC of the other end connection circuit of resistance R 4, the metal shell connection circuit ground GND of Electret condenser microphone MIC;
Preposition audio amplifier circuit: the output of a termination Electret condenser microphone MIC of capacitor C 3; The base stage of another termination NPN type triode VT1 of capacitor C 1; The end of the collector electrode connecting resistance R3 of NPN type triode VT3 and the positive pole of electrochemical capacitor C2; The anodal VCC of the other end connection circuit of resistance R 3, the emitter connection circuit ground GND of NPN type triode VT3;
Volume control circuit: the negative pole of the termination electrochemical capacitor C1 of potentiometer RP, the positive pole of the movable knee-joint electrochemical capacitor C1 of potentiometer RP, the other end connection circuit ground GND of potentiometer RP;
The secondary audio frequency amplifies and audio power amplifying circuit: the base stage of NPN type triode VT2 connects the negative pole of electrochemical capacitor C1 and the end of negative feedback resistor R1; The collector electrode of NPN triode VT2 connects an end of base stage and the resistance R 2 of positive-negative-positive triode VT1; The anodal VCC of the other end connection circuit of resistance R 2; The emitter connection circuit ground GND of NPN type triode VT2, the emitter of positive-negative-positive triode VT1 connects the other end of negative feedback resistor R1, the collector electrode connection circuit ground GND of positive-negative-positive triode VT1;
Earphone interface circuit: the pedestal of earphone socket CK connects the emitter of positive-negative-positive triode VT1, the anodal VCC of the fixed contact connection circuit of earphone socket CK, the anodal VCC1 of the moving contact connection circuit of earphone socket CK.
The positive pole of 3V DC power supply links to each other with circuit anode VCC1, the negative pole connection circuit ground GND of 3V DC power supply.
Description of drawings
Accompanying drawing 1 is the embodiment circuit working schematic diagram that the present invention provides a separate piece hearing aids; For reducing the interference of clutter, require Electret condenser microphone MIC metal shell connection circuit ground GND to Electret condenser microphone MIC.
Embodiment
Implement according to the circuit working schematic diagram of separate piece hearing aids shown in the accompanying drawing 1 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
Electret condenser microphone MIC should select two ends output type Electret condenser microphone for use, and FET is connected into drain electrode for output, can make the remolding sensitivity of Electret condenser microphone higher;
The model that VT1 adopts is positive-negative-positive triode 2SC9012; VT2～VT3 is a NPN type triode, and the model of employing is 2SC9014, requires multiplication factor β >=120 of 3 triodes;
Resistance uses RTX-1/16W type metalfilmresistor, the resistance 180K Ω of negative feedback resistor R1; Resistance 820 Ω of resistance R 2; The resistance 1.5K Ω of resistance R 3; The resistance 5.1K Ω of resistance R 4;
RP selects solid potentiometer for use, and its resistance is 10K Ω;
C1～C2 is an electrochemical capacitor, and capacity all is 47 μ F; C3 selects electric capacity of the dacron for use, and capacity is 0.22 μ F;
Insert earphone is selected the moving-coil type insert earphone for use, and the impedance of insert earphone is 16 Ω.
The circuit production main points
The installation site of Electret condenser microphone MIC should be as much as possible away from audio power amplifying circuit; Electret condenser microphone MIC lead-in wire is unsuitable long; And should adopt shielding conductor; Purpose is to reduce back level amplifying circuit to the interference that front stage circuits caused, and not so extraneous various noise signals are easy to induction and give Electret condenser microphone MIC lead-out wire and cause distortion, even cause the circuit self-excitation.
The circuit debugging method
At first, through the resistance of adjustment resistance R 3, the collector current that makes NPN type triode VT3 is about 1mA; Then, total quiescent current≤6mA of test hearing aids gets final product;
Because of the parameter of the Electret condenser microphone MIC that uses is different, the resistance of resistance R 4 will be done suitable adjustment, should be transferred to that sound is clear, loud to be as the criterion;
The usefulness of negative feedback resistor R1 can be improved tonequality, and its resistance is more little, and to improve the effect of tonequality obvious more, but influences the power output of audio signal, should notice during debugging that volume, tonequality takes into account, and the resistance of negative feedback resistor R1 must not require less than 100K Ω;
Hearing aids is placed in user's the coat pocket; Attention receives sound hole outwardly with Electret condenser microphone MIC's, puts on earphone, and headset plug is inserted in the earphone socket CK of hearing aids; Circuit can automatically be connected the 3V DC power supply, cuts off the electricity supply automatically after extracting headset plug.
Claims (2)
1. separate piece hearing aids, it is made up of 3V DC power supply, pickup circuit, preposition audio amplifier circuit, volume control circuit, the amplification of secondary audio frequency and audio power amplifying circuit, earphone interface circuit, and its characteristic comprises:
The output of Electret condenser microphone MIC links to each other with an end of resistance R 4 in the pickup circuit, the anodal VCC of the other end connection circuit of resistance R 4, the metal shell connection circuit ground GND of Electret condenser microphone MIC;
Preposition audio amplifier circuit: the output of a termination Electret condenser microphone MIC of capacitor C 3; The base stage of another termination NPN type triode VT1 of capacitor C 1; The end of the collector electrode connecting resistance R3 of NPN type triode VT3 and the positive pole of electrochemical capacitor C2; The anodal VCC of the other end connection circuit of resistance R 3, the emitter connection circuit ground GND of NPN type triode VT3;
The negative pole of the termination electrochemical capacitor C1 of potentiometer RP in the volume control circuit, the positive pole of the movable knee-joint electrochemical capacitor C1 of potentiometer RP, the other end connection circuit ground GND of potentiometer RP;
The base stage of NPN type triode VT2 connects the negative pole of electrochemical capacitor C1 and the end of negative feedback resistor R1 in amplification of secondary audio frequency and the audio power amplifying circuit; The collector electrode of NPN triode VT2 connects an end of base stage and the resistance R 2 of positive-negative-positive triode VT1; The anodal VCC of the other end connection circuit of resistance R 2; The emitter connection circuit ground GND of NPN type triode VT2, the emitter of positive-negative-positive triode VT1 connects the other end of negative feedback resistor R1, the collector electrode connection circuit ground GND of positive-negative-positive triode VT1;
The pedestal of earphone socket CK in the earphone interface circuit connects the emitter of positive-negative-positive triode VT1, the anodal VCC of the fixed contact connection circuit of earphone socket CK, the anodal VCC1 of the moving contact connection circuit of earphone socket CK.
2. separate piece hearing aids according to claim 1 is characterized in that: the positive pole of 3V DC power supply links to each other with circuit anode VCC1, the negative pole connection circuit ground GND of 3V DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102625959A CN102740213A (en) | 2012-07-26 | 2012-07-26 | Discrete component hearing aid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102625959A CN102740213A (en) | 2012-07-26 | 2012-07-26 | Discrete component hearing aid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102740213A true CN102740213A (en) | 2012-10-17 |
Family
ID=46994836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102625959A Withdrawn CN102740213A (en) | 2012-07-26 | 2012-07-26 | Discrete component hearing aid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102740213A (en) |
-
2012
- 2012-07-26 CN CN2012102625959A patent/CN102740213A/en not_active Withdrawn
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202385278U (en) | High-performance hearing aid | |
| CN202979276U (en) | Low-voltage frequency modulation wireless microphone | |
| CN102123340A (en) | High-performance hearing-aid made of discrete components | |
| CN105457140A (en) | Electronic device | |
| CN202696883U (en) | Discrete component hearing aid | |
| CN102740213A (en) | Discrete component hearing aid | |
| CN202103846U (en) | High-performance hearing aid made by discrete components | |
| CN202059574U (en) | High sensitivity sound detector prepared by operational amplifiers | |
| CN102123339A (en) | Hearing-aid made of TDA2822M | |
| CN201717940U (en) | Mobile phone provided with hand-free music playing function | |
| CN104682892A (en) | Audio frequency amplifier used for computer speakers | |
| CN202385277U (en) | Hearing aid made of monolithic integrated circuit | |
| CN209517434U (en) | A kind of noise reduction folder neck microphone | |
| CN204721585U (en) | Receiver amplifier | |
| CN201369813Y (en) | Audio power amplification circuit with constant output power selectability | |
| CN107182006B (en) | Sound control circuit for microphone of sound box | |
| CN203136160U (en) | High-loudness electronic audiphone | |
| CN202103847U (en) | High-sensitivity sound detector formed of operational amplifier | |
| CN102291662A (en) | High-sensitivity sound detector made by operation amplifier | |
| CN202014363U (en) | Hearing aid manufactured by TDA2822M | |
| CN203482378U (en) | Active sound box | |
| CN2324703Y (en) | Lower-transient intermodulation distortion audio-frequency amplifier | |
| CN215871821U (en) | Multifunctional wireless microphone based on NFC pairing | |
| CN204859493U (en) | Adopt head circuit of discrete component equipment | |
| CN203504753U (en) | Simple hearing aid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C04 | Withdrawal of patent application after publication (patent law 2001) | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20121017 |