CN202696883U - Discrete component hearing aid - Google Patents
Discrete component hearing aid Download PDFInfo
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- CN202696883U CN202696883U CN 201220366878 CN201220366878U CN202696883U CN 202696883 U CN202696883 U CN 202696883U CN 201220366878 CN201220366878 CN 201220366878 CN 201220366878 U CN201220366878 U CN 201220366878U CN 202696883 U CN202696883 U CN 202696883U
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Abstract
The utility model relates to a discrete component hearing aid. The discrete component hearing aid consists of a 3V direct-current power supply, a pickup circuit, a front end audio frequency amplification circuit, a volume adjusting circuit, a secondary audio amplification and audio power amplification circuit, and an earphone interface circuit. Most hearing aids in the market are designed and manufactured by using a special integrated power amplification circuit, the circuit structures are complex, and the market prices are high. In the discrete component hearing aid, all components are discrete components, a circuit of the discrete component hearing aid has the advantages of simple structure, small quantity of peripheral elements, wide working voltage range, small quiescent current, low power consumption, small distortion factor, good tone quality and the like, the output power can completely meet the requirements of people suffering from hearing disorders, the hearing of the aged can be improved, the study and memory of teenagers can be improved, and the problems of high prices, difficulty in popularizing and the like existing in hearing aids of certain brands in the market are solved or made up.
Description
Technical field
The utility model belongs to electronic technology and audio signal amplification sector, is about a kind of separate piece hearing aids.
Background technology
The multiplex special-purpose integrated amplifier circuit design of hearing aids on the market is made, and its circuit structure is comparatively complicated, and the market price is more expensive.Very many years ago, because the quality and performance of the positive-negative-positive triode that germanium material is made does not pass a test, in order to obtain more clearly signal amplification effect, often adopt the high-frequency triode of germanium material making as the audio signal amplifier element so make hearing aids.Nowadays the present canot compare with the past already for the quality and performance of element, makes hearing aids and need not the more expensive application-specific integrated circuit (ASIC) of price at all, and it is just feasible to select discrete component to design and produce hearing aids.
Separate piece hearing aids described in the utility model all uses discrete component, the 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, the problem such as be difficult for popularizing.
The below describes separate piece hearing aids 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: the multiplex special-purpose integrated amplifier circuit design of the hearing aids on the market is made, and its circuit structure is comparatively complicated, and the market price is more expensive.Separate piece hearing aids described in the utility model all uses discrete component, the 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, the problem such as be difficult for popularizing.
The circuit working principle: the separate piece hearing aids is that Electret condenser microphone MIC is converted to audio signal to acoustic signals, audio signal is delivered to preposition low-frequency amplifier circuit by coupling capacitance C3 and is amplified, resistance R 4 is the adaptive resistance of Electret condenser microphone MIC, for Electret condenser microphone MIC normal operation provides voltage.
The circuit of separate piece hearing aids is to consist of multistage low frequency amplifier by 3 triode VT1～VT3.NPN type triode VT3, resistance R 3 form 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 by earphone socket CK.
Technical scheme: the separate piece hearing aids, it is comprised 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 feature 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 utility model provides a separate piece hearing aids; For reducing clutter to the interference of Electret condenser microphone MIC, require Electret condenser microphone MIC metal shell connection circuit ground GND.
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 utility model.
The selection of components and parts and technical parameter
Electret condenser microphone MIC should select two ends output type Electret condenser microphone, and field effect transistor 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 NPN type triode, and the model of employing is 2SC9014, requires the multiplication factor β of 3 triodes 〉=120;
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, and its resistance is 10K Ω;
C1～C2 is electrochemical capacitor, and capacity all is 47 μ F; C3 selects electric capacity of the dacron, and capacity is 0.22 μ F;
Insert earphone is selected the moving-coil type insert earphone, 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 the interference that the rear class amplifying circuit causes front stage circuits, not so extraneous various noise signal is easy to respond to and causes distortion to Electret condenser microphone MIC lead-out wire, even causes the circuit self-excitation.
The circuit debugging method
At first, by the resistance of adjusting resistance R3, make the collector current of NPN type triode VT3 about 1mA; Then, total quiescent current≤6mA of test hearing aids gets final product;
Because the parameter of the Electret condenser microphone MIC that uses is different, the resistance of resistance R 4 will appropriately adjust, and should be transferred to clear sound, loud being as the criterion;
The usefulness of negative feedback resistor R1 can be improved tonequality, and its resistance is less, and to improve the effect of tonequality more obvious, but affects 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 is subjected to 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, extracts automatic cut-off power behind the headset plug.
Claims (2)
1. separate piece hearing aids, it is comprised 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 feature 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 the 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, it 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 |
|---|---|---|---|
| CN 201220366878 CN202696883U (en) | 2012-07-26 | 2012-07-26 | Discrete component hearing aid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220366878 CN202696883U (en) | 2012-07-26 | 2012-07-26 | Discrete component hearing aid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202696883U true CN202696883U (en) | 2013-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220366878 Expired - Fee Related CN202696883U (en) | 2012-07-26 | 2012-07-26 | Discrete component hearing aid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202696883U (en) |
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2012
- 2012-07-26 CN CN 201220366878 patent/CN202696883U/en not_active Expired - Fee Related
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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: 20130123 Termination date: 20130726 |