CN206547077U - A kind of microphone preamplifier - Google Patents
A kind of microphone preamplifier Download PDFInfo
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- CN206547077U CN206547077U CN201720183650.3U CN201720183650U CN206547077U CN 206547077 U CN206547077 U CN 206547077U CN 201720183650 U CN201720183650 U CN 201720183650U CN 206547077 U CN206547077 U CN 206547077U
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- triode
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- electrochemical capacitor
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- resistor
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Abstract
The utility model is related to a kind of microphone preamplifier, and this case is adapted to the dynamic microphones of 200 to 600 ohm output impedances, and this is the 3 grades of discrete component amplifiers controlled with gain.First triode Q1 is a common-base amplifier, in this case, it is allowed to which the first triode Q1 works in low noise level, improves the signal to noise ratio of signal.Second triode Q2 and the 3rd triode Q3 composition direct coupled amplifiers.First triode Q1 collector voltage is set to the half of supply voltage, and the maximum voltage amplitude of oscillation, and highest overload margin are obtained with this.Herein, the first triode Q1 is operated in 2.4V collector voltage and 200uA collector currents.So low collector current, it is ensured that low-noise performance, the input impedance for also improving this grade is about 400 ohm.The utility model reasonable in design, there is enough power gains, and the noise itself produced is small, and work linear extent is broad.
Description
Technical field
The utility model is related to electronic communication technology field, more particularly to a kind of microphone preamplifier.
Background technology
Be generally termed preamplifier for extracting the amplifier of microphone signal, microphone have condenser type and moving-coil type it
Point, it is referred to as putting before high frequency small-signal amplifier, the FET of this class for amplifying the circuit of small-signal of dynamic microphones
Big device is it is necessary to have enough power gains, and the noise itself produced is small, with characteristics such as work linear extent broadnesses.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of microphone preamplifier, to solve in the prior art
Deficiency.
In order to achieve the above object, the purpose of this utility model is achieved through the following technical solutions：
A kind of microphone preamplifier, including first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th are provided
Resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first electrochemical capacitor, the second electrochemical capacitor, the 3rd electrolysis electricity
Appearance, the 4th electrochemical capacitor, the 5th electrochemical capacitor, the 6th electrochemical capacitor, the first triode, the second triode, the 3rd triode, electricity
Source and microphone, the 5th resistance are variable resistor, first triode, second triode and the three or three pole
Pipe is NPN type triode, one end of the microphone, one end of the first resistor, the negative pole of second electrochemical capacitor,
One end of 4th resistance, one end of the 5th resistance, one end of the 7th resistance, one end of the 9th resistance,
The negative pole of 5th electrochemical capacitor and the negative pole of the power supply are grounded respectively, one end of the second resistance, the 3rd electricity
One end of resistance, one end of the 6th resistance, the positive pole point of the colelctor electrode of the 3rd triode and the 5th electrochemical capacitor
The positive pole of the power supply, the negative pole of another termination first electrochemical capacitor of the microphone, the first electrolysis electricity are not connect
The positive pole of appearance connects the other end of the first resistor and the emitter stage of first triode respectively, second electrochemical capacitor
Positive pole connects the other end of base stage, the other end of the 3rd resistor and the 4th resistance of first triode, institute respectively
The colelctor electrode for stating the first triode connects the other end of the second resistance and the positive pole of the 3rd electrochemical capacitor, described respectively
The negative pole of three electrochemical capacitors connects the other end of the 5th resistance, and the brush of the 5th resistance connects the 4th electrochemical capacitor
Positive pole, the negative pole of the 4th electrochemical capacitor connects one end of the 8th resistance and the base stage of second triode, institute respectively
The emitter stage for stating the second triode connects the other end of the 7th resistance, and the other end of the 8th resistance connects the described 9th respectively
The positive pole of the other end of resistance, the emitter stage of the 3rd triode and the 6th electrochemical capacitor, the 6th resistance it is another
The base stage of one termination the 3rd triode.
Above-mentioned microphone preamplifier, wherein, first triode, second triode and the three or three pole
Guan Jun uses BC547 or BC109C or BC548 or BC549 or BC549C.
Compared with the prior art, the beneficial effects of the utility model are：
Reasonable in design, there is enough power gains, and the noise itself produced is small, and work linear extent is broad.
Brief description of the drawings
Constitute a part of accompanying drawing of the present utility model to be used for providing further understanding to of the present utility model, this practicality is new
The schematic description and description of type is used to explain the utility model, does not constitute to improper restriction of the present utility model.
In accompanying drawing：
Fig. 1 shows the structural representation of the utility model microphone preamplifier.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the utility model can
To be mutually combined.
With reference to shown in Fig. 1, the utility model microphone preamplifier includes first resistor R1, second resistance R2, the 3rd
Resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, first
Electrochemical capacitor C1, the second electrochemical capacitor C2, the 3rd electrochemical capacitor C3, the 4th electrochemical capacitor C4, the 5th electrochemical capacitor C5, the 6th electricity
Solution electric capacity C6, the first triode Q1, the second triode Q2, the 3rd triode Q3, power supply E and microphone Mic, the 5th resistance R5 are
Variable resistor, the first triode Q1, the second triode Q2 and the 3rd triode Q3 are NPN type triode, and the one of microphone Mic
End, first resistor R1 one end, the second electrochemical capacitor C2 negative pole, the 4th resistance R4 one end, the 5th resistance R5 one end,
Seven resistance R7 one end, the 9th resistance R9 one end, the 5th electrochemical capacitor C5 negative pole and power supply E negative pole is grounded respectively, the
Two resistance R2 one end, 3rd resistor R3 one end, the 6th resistance R6 one end, the 3rd triode Q3 colelctor electrode and the 5th electricity
Solution electric capacity C5 positive pole connects power supply E positive pole, microphone Mic the first electrochemical capacitor of another termination C1 negative pole, first respectively
Electrochemical capacitor C1 positive pole connects the first resistor R1 other end and the first triode Q1 emitter stage, the second electrochemical capacitor C2 respectively
Positive pole connect respectively the first triode Q1 base stage, the 3rd resistor R3 other end and the 4th resistance R4 the other end, the one or three
Pole pipe Q1 colelctor electrode connects the second resistance R2 other end and the 3rd electrochemical capacitor C3 positive pole respectively, the 3rd electrochemical capacitor C3's
Negative pole connects the 5th resistance R5 other end, and the 5th resistance R5 brush connects the 4th electrochemical capacitor C4 positive pole, the 4th electrochemical capacitor
C4 negative pole connects the 8th resistance R8 one end and the second triode Q2 base stage respectively, and the second triode Q2 emitter stage connects the 7th
The resistance R7 other end, the 8th resistance R8 other end connects the 9th resistance R9 other end, the 3rd triode Q3 transmitting respectively
Pole and the 6th electrochemical capacitor C6 positive pole, the 6th resistance R6 triode Q3 of another termination the 3rd base stage.This case adaptation 200 to
The dynamic microphones of 600 ohm output impedances, this is the 3 grades of discrete component amplifiers controlled with gain.If not yet
There are BC547 triodes, BC109C, BC548, BC549, BC549C can be used to substitute, performance has almost no change.First triode
Q1 is a common-base amplifier, in this case, it is allowed to which the first triode Q1 works in low noise level, improves signal
Signal to noise ratio.Second triode Q2 and the 3rd triode Q3 composition direct coupled amplifiers.The signal of moving-coil microphone is than relatively low
, generally than 10mV much less, the first triode Q1 collector voltage is set to the half of supply voltage, is obtained most with this
Big voltage swing, and highest overload margin.Herein, the first triode Q1 be operated in 2.4V collector voltage and
200uA collector currents.So low collector current, it is ensured that low-noise performance, also improves the input impedance of this grade about
For 400 ohm.
From above-described embodiment as can be seen that advantage of the present utility model is：
Reasonable in design, there is enough power gains, and the noise itself produced is small, and work linear extent is broad.
Specific embodiment of the utility model is described in detail above, but the utility model is not restricted to the above
The specific embodiment of description, it is intended only as example.To those skilled in the art, any equivalent modifications and substitute also all
Among category of the present utility model.Therefore, the impartial conversion made in the case where not departing from spirit and scope of the present utility model
And modification, it should all cover in the range of the utility model.
Claims (2)
1. a kind of microphone preamplifier, it is characterised in that including first resistor, second resistance, 3rd resistor, the 4th electricity
Resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first electrochemical capacitor, the second electrochemical capacitor,
Three electrochemical capacitors, the 4th electrochemical capacitor, the 5th electrochemical capacitor, the 6th electrochemical capacitor, the first triode, the second triode, the 3rd
Triode, power supply and microphone, the 5th resistance are variable resistor, first triode, second triode and institute
It is NPN type triode to state the 3rd triode, one end of the microphone, one end of the first resistor, second electrolysis
The negative pole of electric capacity, one end of the 4th resistance, one end of the 5th resistance, one end of the 7th resistance, the described 9th
The negative pole of one end of resistance, the negative pole of the 5th electrochemical capacitor and the power supply is grounded respectively, one end of the second resistance,
One end of the 3rd resistor, one end of the 6th resistance, the colelctor electrode of the 3rd triode and the 5th electrolysis electricity
The positive pole of appearance connects the positive pole of the power supply respectively, and the negative pole of another termination first electrochemical capacitor of the microphone is described
The positive pole of first electrochemical capacitor connects the other end of the first resistor and the emitter stage of first triode, described second respectively
The positive pole of electrochemical capacitor connects base stage, the other end of the 3rd resistor and the 4th resistance of first triode respectively
The other end, the colelctor electrode of first triode is connecing the other end and the 3rd electrochemical capacitor of the second resistance just respectively
Pole, the negative pole of the 3rd electrochemical capacitor connects the other end of the 5th resistance, and the brush of the 5th resistance connects the described 4th
The positive pole of electrochemical capacitor, the negative pole of the 4th electrochemical capacitor connects one end of the 8th resistance and second triode respectively
Base stage, the emitter stage of second triode connects the other end of the 7th resistance, the other end difference of the 8th resistance
Connect the positive pole of the other end, the emitter stage of the 3rd triode and the 6th electrochemical capacitor of the 9th resistance, described
The base stage of another termination the 3rd triode of six resistance.
2. microphone preamplifier as claimed in claim 1, it is characterised in that first triode, the two or three pole
Pipe and the 3rd triode use BC547 or BC109C or BC548 or BC549 or BC549C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720183650.3U CN206547077U (en) | 2017-02-28 | 2017-02-28 | A kind of microphone preamplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720183650.3U CN206547077U (en) | 2017-02-28 | 2017-02-28 | A kind of microphone preamplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206547077U true CN206547077U (en) | 2017-10-10 |
Family
ID=59995344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720183650.3U Expired - Fee Related CN206547077U (en) | 2017-02-28 | 2017-02-28 | A kind of microphone preamplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206547077U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290899A (en) * | 2020-10-26 | 2021-01-29 | 杭州爱华仪器有限公司 | Measuring circuit preamplifier |
-
2017
- 2017-02-28 CN CN201720183650.3U patent/CN206547077U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290899A (en) * | 2020-10-26 | 2021-01-29 | 杭州爱华仪器有限公司 | Measuring circuit preamplifier |
| CN112290899B (en) * | 2020-10-26 | 2024-02-06 | 杭州爱华仪器有限公司 | Preamplifier of measuring circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171010 Termination date: 20210228 |
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| CF01 | Termination of patent right due to non-payment of annual fee |