CN203057087U - Microphone amplifying circuit - Google Patents
Microphone amplifying circuit Download PDFInfo
- Publication number
- CN203057087U CN203057087U CN 201220664255 CN201220664255U CN203057087U CN 203057087 U CN203057087 U CN 203057087U CN 201220664255 CN201220664255 CN 201220664255 CN 201220664255 U CN201220664255 U CN 201220664255U CN 203057087 U CN203057087 U CN 203057087U
- Authority
- CN
- China
- Prior art keywords
- microphone
- amplifying circuit
- operational amplifier
- microphone amplifying
- series
- 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.)
- Expired - Fee Related
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- Adjustable Resistors (AREA)
Abstract
The utility model discloses a microphone amplifying circuit, and belongs to the electrics field. The microphone amplifying circuit comprises signal power sources, microphone internal resistors and external resistors which are successively connected in series, wherein all series branches composed of the signal power sources, the microphone internal resistors and the external resistors are connected with an operational amplifier which is in series connection with the external resistors. With the abovementioned arrangement, the defects that complicated circuits are adopted for letting out sound when conventional microphones are used, and costs are increased because circuits need to be added when many people sing together are overcome; and a microphone manufactured by using the microphone amplifying circuit is simple in circuit and does not need a plurality of circuits, thereby greatly saving costs, and making the microphone amplifying circuit suitable for popularization and application.
Description
Technical field
The utility model relates to a kind of circuit, concretely, belongs to a kind of microphone amplifying circuit.
Background technology
Microphone, be widely used in KTV, concert, occasions such as concert, existing microphone is emitted sound by sound equipment, and this implementation all is that the complicated circuit that adopts is resolved, when chorusing as if many people simultaneously, each needs a microphone per capita, signal need be transferred on the circuit of each microphone correspondence like this, causes cost to increase greatly like this.
The utility model content
The purpose of this utility model is to adopt when overcoming existing microphone emits sound many people of complicated circuit while to chorus increases the defective that circuit causes cost to increase, and a kind of microphone amplifying circuit is provided, and addresses the aforementioned drawbacks.
To achieve these goals, the technical solution adopted in the utility model is as follows:
A kind of microphone amplifying circuit comprises successively resistance and non-essential resistance in the signal power source, microphone of series connection, wherein also is connected with operational amplifier on the series arm of being made up of above-mentioned three, and this operational amplifier is connected with non-essential resistance.
In order to realize the multiple branch circuit input, described series arm has two at least, and the non-essential resistance on all series arms all links to each other electrode input end ground connection with the negative input of operational amplifier.
Further, also be connected with slide rheostat between the negative input of described operational amplifier and the output.
As a kind of preferred, the resistance of described slide rheostat is 10k Ω～500k Ω.
Compared with prior art, the utlity model has following beneficial effect:
(1) the utility model circuit structure is simple, with low cost, has overcome the defective of available technology adopting complicated circuit, is fit to promote the use of.
(2) on operational amplifier, can connect many branch roads in the utility model, but only need this operational amplifier to get final product, save cost so greatly, also dwindle the area that circuit takies simultaneously.
(3) the utility model load resistance has simultaneously adopted slide rheostat, makes the multiplication factor of operational amplifier carry out conversion by the effective resistance value transform of slide rheostat, can accurately control volume like this, satisfies the needs of different occasions.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model-embodiment.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment, and execution mode of the present utility model includes but not limited to the following example.
Embodiment
As shown in Figure 1, the utility model has three microphones 1, microphone 2 and microphone 3, therefore has three signal power sources, and the signal of telecommunication of generation is respectively V
1, V
2, V
3, and the interior resistance of each microphone is R
S, its concrete resistance is preferably 0.5k Ω.Wherein the non-essential resistance of microphone 1 polyphone is R
1Be 1.5 k Ω, the non-essential resistance R of microphone 2 series connection
2Be k Ω, wherein Fig. 1 is the circuit theory diagrams of equivalence, so signal power source, interior resistance and the non-essential resistance of each microphone connected successively among Fig. 1, and all is connected the negative input of operational amplifier, this negative input links to each other with non-essential resistance, electrode input end ground connection.
This moment, slide rheostat R4 two ends linked to each other with output with the operational amplifier negative input respectively, the resistance of slide rheostat R4 were moved to the position of 100k Ω.
Because the gain of the series arm of microphone 1 and microphone 2 is identical, the branch gain of microphone 3 is the twice of microphone 1 series arm gain.Work as V
1=V
2=V
3During=10mV, the voltage V of output
0=2V.
According to above-described embodiment, just can realize the utility model well.
Claims (4)
1. a microphone amplifying circuit is characterized in that, comprises successively resistance and non-essential resistance in the signal power source, microphone of series connection, wherein also is connected with operational amplifier on the series arm of being made up of above-mentioned three, and this operational amplifier is connected with non-essential resistance.
2. a kind of microphone amplifying circuit according to claim 1 is characterized in that, described series arm has two at least, and the non-essential resistance on all series arms all links to each other with the negative input of operational amplifier.
3. a kind of microphone amplifying circuit according to claim 2 is characterized in that, also is connected with slide rheostat, electrode input end ground connection between the negative input of described operational amplifier and the output.
4. a kind of microphone amplifying circuit according to claim 3 is characterized in that, the resistance of described slide rheostat is 10k Ω～500k Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220664255 CN203057087U (en) | 2012-12-06 | 2012-12-06 | Microphone amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220664255 CN203057087U (en) | 2012-12-06 | 2012-12-06 | Microphone amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203057087U true CN203057087U (en) | 2013-07-10 |
Family
ID=48740003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220664255 Expired - Fee Related CN203057087U (en) | 2012-12-06 | 2012-12-06 | Microphone amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203057087U (en) |
-
2012
- 2012-12-06 CN CN 201220664255 patent/CN203057087U/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: 20130710 Termination date: 20131206 |