CN205491096U

CN205491096U - Microphone pronunciation amplifier circuit

Info

Publication number: CN205491096U
Application number: CN201620103611.3U
Authority: CN
Inventors: 严颖
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-02-02
Filing date: 2016-02-02
Publication date: 2016-08-17
Anticipated expiration: 2026-02-02

Abstract

The utility model discloses a microphone pronunciation amplifier circuit, include microphone and the pronunciation amplifier circuit who is connected with the microphone, the concrete components and parts of circuit include: it is first to the tenth resistance, first to the 9th electric capacity, first to third triode and first, second diode. The utility model discloses a mutual bias circuit, the stability of single -tube circuit has been improved to problem that the change of having overcome transistor yin wendu caused the quiescent operation point of setting also to change thereupon, has strengthened the result of use of microphone.

Description

A kind of mike voice amplification circuit

Technical field

The utility model discloses a kind of mike voice amplification circuit, relate to electric and electronic technical field.

Background technology

Mike, formal name used at school is microphone, is the energy conversion device that acoustical signal is converted to the signal of telecommunication, by " Microphone " this English word transliteration.Also referred to as microphone, mike.Twentieth century, mike is developed into inductance, condenser type conversion by initially passing through resistance conversion acoustic-electric, the newest microphone techniques gradually grows up, and includes the mike such as aluminium strip, moving-coil among these, and is currently being widely used capacitance microphone and electret microphone.

In language teaching, mike is a kind of the more commonly used and important teaching aid, in order to mike has more preferable using effect, is generally all provided with voice amplification circuit in mike.In amplifying circuit, most basic small signal amplifier is logical is with audion as core, simultaneously in order to be able to the performance obtained, it will usually increase various negative feedback.

In prior art, voice amplification circuit is usually present the problem that transistor causes the quiescent point of setting to change the most therewith because of the change of temperature, and the stability causing single-tube circuit is not enough.

Utility model content

Technical problem to be solved in the utility model is: for the defect of prior art, it is provided that a kind of mike voice amplification circuit.

This utility model is for solving above-mentioned technical problem by the following technical solutions:

A kind of mike voice amplification circuit, including mike and the voice amplification circuit that is connected with mike, described voice amplification circuit includes the first to the tenth resistance, the first to the 9th electric capacity, the first to the 3rd audion and first, second diode, wherein,

nullFirst outfan of mike respectively with one end of the first resistance、One end of first electric capacity is connected，The other end of the first resistance respectively with one end of the 3rd electric capacity、One end of 5th resistance、One end of 6th resistance is connected，The other end ground connection of the 3rd electric capacity，The other end of the 5th resistance respectively with one end of the 5th electric capacity、One end of 6th electric capacity、The base stage of the second audion、The colelctor electrode of the first audion is connected，The other end of the 6th resistance respectively with one end of the 7th resistance、One end of 7th electric capacity、The colelctor electrode of the 3rd audion、The negative pole of the first diode、The positive pole of the second diode is connected，The other end ground connection of the 7th electric capacity，The positive pole of the first diode connects and draws power end，The other end of the 7th resistance respectively with the other end of the 5th electric capacity、The other end of the 6th electric capacity、The colelctor electrode of the second audion、The base stage of the 3rd audion is connected，The other end of the first electric capacity respectively with one end of the second electric capacity、One end of second resistance is connected，The other end of the second electric capacity respectively with the base stage of the first audion、One end of 3rd resistance is connected，The other end of the 3rd resistance respectively with one end of the 4th electric capacity、The emitter stage of the first audion、One end of 4th resistance、One end of 8th resistance、One end of 9th resistance is connected，The other end of the 8th resistance and the emitter stage of the second audion are connected，The emitter stage of the 3rd audion respectively with one end of the 8th electric capacity、One end of 9th electric capacity、The movement of the tenth resistance is connected，Second outfan of mike respectively with the other end of the second resistance、The other end of the 4th electric capacity、The other end of the 4th resistance、The other end of the 9th resistance、The other end of the tenth resistance、The other end of the 9th electric capacity、The other end of the 8th electric capacity、The negative pole of the second diode is connected and ground connection is simultaneously connected with the outfan of circuit.

As further preferred scheme of the present utility model, described first to the tenth resistance is carbon film resistor.

As further preferred scheme of the present utility model, the model of described second diode is 1N4007.

As further preferred scheme of the present utility model, described first diode is light emitting diode.

As further preferred scheme of the present utility model, the model of described first to the 3rd audion is 9014.

This utility model uses above technical scheme compared with prior art, have following technical effect that employing is mutually offset circuit, overcome the problem that transistor causes the quiescent point of setting to change the most therewith because of the change of temperature, improve the stability of single-tube circuit, enhance the using effect of mike.

Accompanying drawing explanation

Fig. 1 is circuit connection diagram of the present utility model；

Wherein: R1 to R10 is the first to the tenth resistance, C1 to C9 is the first to the 9th electric capacity, and T1 to T3 is the first to the 3rd audion, and D1, D2 are respectively first, second diode.

Detailed description of the invention

Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings, and the most same or similar label represents same or similar element or has the element of same or like function.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining this utility model, and can not be construed to restriction of the present utility model.

Below in conjunction with the accompanying drawings the technical solution of the utility model is described in further detail:

Circuit connection diagram of the present utility model is as shown in Figure 1, a kind of mike voice amplification circuit, including mike and the voice amplification circuit that is connected with mike, described voice amplification circuit includes the first to the tenth resistance, first to the 9th electric capacity, first to the 3rd audion and first, second diode, wherein

The Multi-stage small signal amplifier being made up of three audions, T1 and T2 forms voltage gain amplifier, T3 is emitter-follower, there is no voltage gain, although circuit is three grades of direct-couplings, but adjusting relatively easy, this grade of T1 Yu T2 has certain alternating current-direct current negative feedback, the base current of T1 is the voltage drop on R9 taken from by R3 and be proportional to T2.Using and this be mutually offset circuit, mainly solve the problem that transistor causes the quiescent point of setting to change the most therewith because of the change of temperature, the most this circuit is than the good stability of other single-tube circuits.

Above in conjunction with accompanying drawing, embodiment of the present utility model is explained in detail, but this utility model is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art are possessed, it is also possible to make a variety of changes on the premise of without departing from this utility model objective.The above, it it is only preferred embodiment of the present utility model, not this utility model is made any pro forma restriction, although this utility model is disclosed above with preferred embodiment, but it is not limited to this utility model, any those skilled in the art, in the range of without departing from technical solutions of the utility model, when the technology contents of available the disclosure above makes a little change or is modified to the Equivalent embodiments of equivalent variations, in every case it is without departing from technical solutions of the utility model content, according to technical spirit of the present utility model, within spirit of the present utility model and principle, the any simple amendment that above example is made, equivalent and improvement etc., within all still falling within the protection domain of technical solutions of the utility model.

Claims

1. a mike voice amplification circuit, including mike and the voice amplification circuit that is connected with mike, it is characterised in that: described voice amplification circuit includes the first to the tenth resistance, first to the 9th electric capacity, first to the 3rd audion and first, second diode, wherein

2. a kind of mike voice amplification circuit as claimed in claim 1, it is characterised in that: described first to the tenth resistance is carbon film resistor.

3. a kind of mike voice amplification circuit as claimed in claim 1, it is characterised in that: the model of described second diode is 1N4007.

4. a kind of mike voice amplification circuit as claimed in claim 1, it is characterised in that: described first diode is light emitting diode.

5. a kind of mike voice amplification circuit as claimed in claim 1, it is characterised in that: the model of described first to the 3rd audion is 9014.