CN202103847U - High-sensitivity sound detector formed of operational amplifier - Google Patents
High-sensitivity sound detector formed of operational amplifier Download PDFInfo
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- CN202103847U CN202103847U CN2011201325074U CN201120132507U CN202103847U CN 202103847 U CN202103847 U CN 202103847U CN 2011201325074 U CN2011201325074 U CN 2011201325074U CN 201120132507 U CN201120132507 U CN 201120132507U CN 202103847 U CN202103847 U CN 202103847U
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Abstract
The utility model relates to a high-sensitivity sound detector formed of an operational amplifier, which comprises a direct-current power supply DC (direct current), a pickup circuit, a primary amplifier circuit and a secondary amplifier circuit. The high-sensitivity sound detector is characterized in that the model of an operational amplifier IC1 (integrated circuit1) of two amplifier circuits is LM324, and the two amplifier circuits are respectively connected with a negative feedback resistance R4 and a negative resistance R5. The circuit of the high sensitivity sound detector is a combination of the operational amplifier and a few discrete components. The high-sensitivity sound detector has the advantages of simple structure, few periphery components, low cross distortion, wide operating voltage range, small static current, low power consumption and on the like. The sound detector has extremely strong directivity and extremely high sensitivity, pickup sensitivity thereof is much higher than that of common hearing-aids, and the sound detector is capable of detecting and hearing extremely weak far-distance sound human being can't hear directly.
Description
Technical field
The utility model belongs to electronic technology and audio frequency amplifying technique field, is to make the high sensitivity sound-detection gear about a kind of with operational amplifier.
Background technology
It is exactly a highly sensitive pick-up to the described sound-detection gear of the utility model in fact; Its circuit structure has a lot of similar places with operation principle with general hearing aids; Different is that sound-detection gear has extremely strong directive property and high sensitivity; It is more much higher than common hearing aid sensitivity, can snoop the atomic weak sound that far people from place ear can't directly be heard.The utility model is through field trial, and it can receive eardrum to the greatest extent with the conversation content that move field player and coach have a buzz of talk.It can be widely used in outdoor news interview, production of film and TV, public security officer and handle a case, monitors at a distance and work such as bulk storage plant antitheft.
Characteristics such as the circuit of the utility model uses common operational amplifier LM324 integrated circuit as core parts, and that its circuit has is simple in structure, peripheral component is few and operating voltage range broad, quiescent current are little, little power consumption, distortion are little.
Specify below that the utility model is described makes high sensitivity sound-detection gear related relevant technologies content in manufacturing process with operational amplifier.
The utility model content
Goal of the invention and beneficial effect: the utility model is described to adopt operational amplifier and a small amount of discrete component to combine with operational amplifier making high sensitivity sound-detection gear.This sound-detection gear has characteristics such as circuit structure is simple, peripheral cell is few, cross distortion is little and operating voltage range is wide, quiescent current is little, little power consumption.Sound-detection gear has extremely strong directive property and high sensitivity, and its common hearing aids of pickup remolding sensitivity wants nice and high many, can snoop far people from place ear easily and can't directly hear atomic weak sound.
Technical scheme: make the high sensitivity sound-detection gear with operational amplifier, be made up of DC power supply DC, pickup circuit, one-level amplifying circuit and second amplifying circuit, the model of operational amplifier IC1 is LM324 in the two-stage amplifying circuit.
Connection features in the composition of each several part circuit and the circuit between the components and parts
The pickup circuit is made up of Electret condenser microphone MIC, resistance R 1, capacitor C 1; Its connection features is: the end of the output D connecting resistance R1 of Electret condenser microphone MIC and an end of capacitor C 1; The metal shell termination circuit ground GND of Electret condenser microphone MIC; The anodal VCC of the other end connection circuit of resistance R 1,3 pin of another termination operational amplifier IC1-A of capacitor C 1.
The one-level amplifying circuit is made up of operational amplifier IC1-A, resistance R 2, resistance R 3, electrochemical capacitor C2, capacitor C 3 and negative feedback resistor R4; Its connection features is: 2 pin of operational amplifier IC1-A link to each other with an end of an end of resistance R 2, resistance R 3 and the positive pole of electrochemical capacitor C2; The anodal VCC of the other end connection circuit of resistance R 2; The negative pole connection circuit ground GND of the other end of resistance R 3 and electrochemical capacitor C2; 1 pin of the termination operational amplifier IC1-A of negative feedback resistor R4 and an end of capacitor C 3,3 pin of another termination operational amplifier IC1-A of negative feedback resistor R4,13 pin of another termination operational amplifier IC1-D of capacitor C 3.
Second amplifying circuit is made up of operational amplifier IC1-D, negative feedback resistor R5, electrochemical capacitor C4 and earphone SP; Its connection features is: the anodal VCC of the 4 pin connection circuits of operational amplifier IC1-D; The 11 pin connection circuit ground GND of operational amplifier IC1-D; 14 pin of operational amplifier IC1-D link to each other with the end of the positive pole of electrochemical capacitor C4, negative feedback resistor R5; Connection circuit ground GND behind the negative pole serial connection earphone SP of electrochemical capacitor C4,13 pin of another termination operational amplifier IC1-D of negative feedback resistor R5,12 pin of operational amplifier IC1-D connect 2 pin of operational amplifier IC1-A.
The circuit working principle: Electret condenser microphone MIC requires to be contained in special gathering in the sound bobbin in the accompanying drawing, and purpose is assigned direction sound at a distance to be received come, and the sound of other directions is significantly suppressed.Voice signal is transformed into tone currents through Electret condenser microphone MIC, and audio signal is amplified to amplifier through capacitor C 1 coupling then.Amplifier is made up of the two-stage amplifying circuit; The first order is made up of one group of operational amplifier among four groups of operational amplifier IC1; The amplification quantity that 120 multiplication benefits are arranged approximately, the second level is made up of another group operational amplifier among four groups of operational amplifier IC1, and the amplification quantity of 500 multiplication benefits is arranged approximately.So big multiplication factor is enough to atomic weak audio signal is amplified, and exports earphone SP at last to.Utilize it can snoop the faint sound that far people from place ear can't directly be heard.
Description of drawings
Accompanying drawing is that the utility model provides an embodiment circuit working schematic diagram of making the high sensitivity sound-detection gear with operational amplifier; Integrated four groups of operational amplifiers in the operational amplifier IC1 in the accompanying drawing, the utility model has only been used two of four operational amplifier LM324 IC1-A, IC1-D wherein.
Embodiment
According to implementing with the circuit working schematic diagram of operational amplifier making high sensitivity sound-detection gear and the components and parts specification requirement of description of drawings and the following stated shown in the accompanying drawing, can realize the utility model.
The selection of components and parts and technical parameter thereof
IC1 is an operational amplifier, and model is selected LM324 for use, and it adopts 14 pin dual-in-line Plastic Package forms.Internal circuit at it comprises four groups of identical operational amplifiers of form, except that power sharing, four groups of amplifiers are separate, and present embodiment has only been used two of IC1-A, IC1-D among four groups of operational amplifier LM324;
MIC is an Electret condenser microphone, requires to select for use two ends output type Electret condenser microphone, and its drain electrode be the audio signal output end D of microphone MIC, the metal shell end of the Electret condenser microphone connection circuit ground GND afterwards that links to each other with source S.FET is connected into drain electrode is output, its output signal has certain voltage gain, can make the sensitivity of Electret condenser microphone higher.Electret condenser microphone MIC select for use the CM-18W type (the high sensitivity Electret condenser microphone of φ 10mm * 6.5mm), its sensitivity is divided into five retainings, representes with color dot respectively, present embodiment is selected the product of white point for use;
Resistance uses RTX-1/16W type metalfilmresistor, and the resistance of resistance R 1～R3 is 12K Ω; The resistance of resistance R 4, R5 is 910K Ω;
C1, C3 select electric capacity of the dacron for use, and its capacity is respectively 0.47 μ F, 0.33 μ F;
C2, C4 select the withstand voltage electrochemical capacitor of 16V that is, its capacity is respectively 22 μ F, 470 μ F;
SP is an earphone, selects moving coil earphone for use, and its impedance is 36 Ω, and the impedance that earphone is selected for use is more little, and the power of audio signal output is big more, but tonequality slightly descends;
The voltage of DC power supply DC is 6～9V, and available four joints or the series connection of five batteries are used.
Circuit production and debugging
The installation of Electret condenser microphone MIC should be as much as possible away from the two-stage amplifying circuit; The lead-in wire of Electret condenser microphone MIC should adopt shielding conductor and unsuitable long; Purpose is to reduce the interference that the previous stage amplifying signal is caused back one-level amplifying circuit; Otherwise causing easily that extraneous various noise signal is responded to lead-out wire causes audio distortion, even causes disagreeable howling.For further reducing the interference of electromagnetic signal, require the shell connection circuit ground GND of Electret condenser microphone MIC.
For Electret condenser microphone MIC can be received assigned direction sound at a distance, Electret condenser microphone MIC should be contained in special gathering in the sound bobbin, and the appearance that requires to gather the sound bobbin should be attached with sound-absorbing material.
Conscientiously detect the performance of each components and parts, each components and parts all can not wrong, pay special attention to polarized component and can not connect instead, like DC power supply DC, Electret condenser microphone MIC and electrochemical capacitor etc., and will guarantee the welding quality of components and parts.
When circuit debugging, if find that circuit working is stable inadequately, at first can take to strengthen filtering to DC power supply DC, secondly be suitably to reduce the resistance of resistance R 4 or resistance R 5 in the negative-feedback circuit and reduce gain amplifier.Improve the operating voltage of DC power supply DC, can effectively increase the power output of sound-detection gear sensitivity and audio signal.
High because of the sensitivity of this sound-detection gear, when circuit debugging, cut and can not be too near to Electret condenser microphone MIC speech! General speech requires more than 6m apart from Electret condenser microphone MIC.
Claims (1)
1. make the high sensitivity sound-detection gear with operational amplifier for one kind, be made up of DC power supply DC, pickup circuit, one-level amplifying circuit and second amplifying circuit, the model of operational amplifier IC1 is LM324 in the two-stage amplifying circuit, it is characterized in that:
The pickup circuit is made up of Electret condenser microphone MIC, resistance R 1, capacitor C 1; The end of the output D connecting resistance R1 of Electret condenser microphone MIC and an end of capacitor C 1; The metal shell termination circuit ground GND of Electret condenser microphone MIC; The anodal VCC of the other end connection circuit of resistance R 1,3 pin of another termination operational amplifier IC1-A of capacitor C 1;
The one-level amplifying circuit is made up of operational amplifier IC1-A, resistance R 2, resistance R 3, electrochemical capacitor C2, capacitor C 3 and negative feedback resistor R4; 2 pin of operational amplifier IC1-A link to each other with an end of an end of resistance R 2, resistance R 3 and the positive pole of electrochemical capacitor C2; The anodal VCC of the other end connection circuit of resistance R 2; The negative pole connection circuit ground GND of the other end of resistance R 3 and electrochemical capacitor C2; 1 pin of the termination operational amplifier IC1-A of negative feedback resistor R4 and an end of capacitor C 3,3 pin of another termination operational amplifier IC1-A of negative feedback resistor R4,13 pin of another termination operational amplifier IC1-D of capacitor C 3;
Second amplifying circuit is made up of operational amplifier IC1-D, negative feedback resistor R5, electrochemical capacitor C4 and earphone SP; The anodal VCC of the 4 pin connection circuits of operational amplifier IC1-D; The 11 pin connection circuit ground GND of operational amplifier IC1-D; 14 pin of operational amplifier IC1-D link to each other with the end of the positive pole of electrochemical capacitor C4, negative feedback resistor R5; Connection circuit ground GND behind the negative pole serial connection earphone SP of electrochemical capacitor C4,13 pin of another termination operational amplifier IC1-D of negative feedback resistor R5,12 pin of operational amplifier IC1-D connect 2 pin of operational amplifier IC1-A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201325074U CN202103847U (en) | 2011-04-28 | 2011-04-28 | High-sensitivity sound detector formed of operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201325074U CN202103847U (en) | 2011-04-28 | 2011-04-28 | High-sensitivity sound detector formed of operational amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN202103847U true CN202103847U (en) | 2012-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201325074U Expired - Fee Related CN202103847U (en) | 2011-04-28 | 2011-04-28 | High-sensitivity sound detector formed of operational amplifier |
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| Country | Link |
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| CN (1) | CN202103847U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355621A (en) * | 2011-06-01 | 2012-02-15 | 刘喆 | High-sensitivity sound detector manufactured by operational amplifiers |
-
2011
- 2011-04-28 CN CN2011201325074U patent/CN202103847U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355621A (en) * | 2011-06-01 | 2012-02-15 | 刘喆 | High-sensitivity sound detector manufactured by operational amplifiers |
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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: 20120104 Termination date: 20120428 |