CN203537554U - Simple earphone circuit for English teaching - Google Patents
Simple earphone circuit for English teaching Download PDFInfo
- Publication number
- CN203537554U CN203537554U CN201320692911.6U CN201320692911U CN203537554U CN 203537554 U CN203537554 U CN 203537554U CN 201320692911 U CN201320692911 U CN 201320692911U CN 203537554 U CN203537554 U CN 203537554U
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- China
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- resistance
- triode
- electric capacity
- capacitor
- resistor
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Abstract
The utility model discloses a simple earphone circuit for English teaching, which comprises the components of: a battery, a switch, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a potentiometer, a first triode, a second triode, a third triode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, an audio receiving coil and a loudspeaker. According to the simple earphone circuit provided by the utility model, one triode is adopted for forming a front-end audio amplifying circuit; two triodes form a two-stage direct-coupling low-frequency amplifying circuit; a low-frequency signal which is sensed on the audio receiving coil is coupled to the amplifying circuit through the capacitors for amplifying; the loudspeaker generates sound; and the potentiometer can adjust the sound volume. The simple earphone circuit for English teaching has advantages of simple circuit structure, small number of components, low cost, high sensitivity and high audio effect. Furthermore the simple earphone circuit for English teaching facilitates popularization.
Description
Technical field
The utility model relates to a kind of head circuit, relates in particular to a kind of easy English teaching head circuit.
Background technology
The informationization of social life and economic globalization, become increasingly conspicuous the importance of English.English, as one of most important information carrier, has become most popular language in human lives's every field." listen " and in communication, account for very consequence, a kind of test question type of English Listening Comprehension Chang Zuowei, object is to investigate the assurance of candidate to English language, investigates the understandability of examinee to the daily interchange of English.Along with the raising of level of education, the corresponding lifting aspect education hardware facility of each colleges and universities, is also doing a lot of improvement aspect training of students English Listening Comprehension and examination English.Earphone is generally for English teaching, yet a lot of head circuits are complicated, element is many, cost is high, sensitivity is low, acoustical quality is poor, are unfavorable for promoting the use of.
Utility model content
The purpose of this utility model provides a kind of easy English teaching head circuit with regard to being in order to address the above problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The utility model comprises battery, switch, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, potentiometer, the first triode, the second triode, the 3rd triode, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, audio frequency receiving coil and loud speaker, the anodal while of described battery and the first end of described the 7th resistance, the first end of described the 3rd resistance, the first end of described the second resistance is connected with the first end of described the second electric capacity, the second end while of described the 7th resistance and the first end of described the 6th resistance, the first end of described the 3rd electric capacity is connected with the collector electrode of described the first triode, the second end of described the 6th resistance is connected with the base stage of described the first triode with the first end of described the 5th electric capacity simultaneously, the second end of described the 5th electric capacity connects the first end of described audio frequency receiving coil, the second end of described the 3rd electric capacity connects the first end of described potentiometer, the sliding end of described potentiometer connects the first end of described the 4th electric capacity, the second end of described the 4th electric capacity is connected with the base stage of described the second triode with the first end of described the 4th resistance simultaneously, the second end while of described the 4th resistance and the base stage of described the 3rd triode, the first end of described the first electric capacity, the second end of described the 3rd resistance is connected with the collector electrode of described the second triode, and the emitter-base bandgap grading of described the second triode connects the first end of described the 5th resistance, the second end while of described the second resistance and the first end of described loud speaker, the second end of the collector electrode of described the 3rd triode and described the first electric capacity is connected, the emitter-base bandgap grading of described the 3rd triode connects the first end of described the first resistance, the negative pole of described battery connects the first end of described switch, the second end while of described switch and the second end of described loud speaker, the second end of described the first resistance, the second end of described the second electric capacity, the second end of described the 5th resistance, the second end of described potentiometer, the second end ground connection of the emitter-base bandgap grading of described the first triode and described audio frequency receiving coil.
The beneficial effects of the utility model are:
The utility model circuit adopts a triode to form preposition audio amplifier circuit, two triodes form two-stage direct-coupling low-frequency amplifier circuit, the low frequency signal inducing on audio frequency receiving coil amplifies through being capacitively coupled to amplifying circuit, loud speaker sounding, potentiometer can regulate volume, and circuit structure is simple, element is few, cost is low, highly sensitive, acoustical quality is good, be conducive to promote.
Accompanying drawing explanation
Fig. 1 is circuit structure schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1: the utility model comprises battery E, switch S, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, potentiometer RP, the first triode VT1, the second triode VT2, the 3rd triode VT3, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, audio frequency receiving coil L and loud speaker BY, the anodal while of battery E and the first end of the 7th resistance R 7, the first end of the 3rd resistance R 3, the first end of the second resistance R 2 is connected with the first end of the second capacitor C 2, the second end while of the 7th resistance R 7 and the first end of the 6th resistance R 6, the first end of the 3rd capacitor C 3 is connected with the collector electrode of the first triode VT1, the second end of the 6th resistance R 6 is connected with the base stage of the first triode VT1 with the first end of the 5th capacitor C 5 simultaneously, the second end of the 5th capacitor C 5 connects the first end of audio frequency receiving coil L, the second end of the 3rd capacitor C 3 connects the first end of potentiometer RP, the sliding end of potentiometer RP connects the first end of the 4th capacitor C 4, the second end of the 4th capacitor C 4 is connected with the base stage of the second triode VT2 with the first end of the 4th resistance R 4 simultaneously, the second end while of the 4th resistance R 4 and the base stage of the 3rd triode VT3, the first end of the first capacitor C 1, the second end of the 3rd resistance R 3 is connected with the collector electrode of the second triode VT2, and the emitter-base bandgap grading of the second triode VT2 connects the first end of the 5th resistance R 5, the second end while of the second resistance R 2 and the first end of loud speaker BY, the collector electrode of the 3rd triode VT3 is connected with the second end of the first capacitor C 1, and the emitter-base bandgap grading of the 3rd triode VT3 connects the first end of the first resistance R 1, the first end of the negative pole connecting valve S of battery E, the second end while of switch S and the second end of loud speaker BY, the second end of the first resistance R 1, the second end of the second capacitor C 2, the second end of the 5th resistance R 5, the second end of potentiometer RP, the second end ground connection of the emitter-base bandgap grading of the first triode VT1 and audio frequency receiving coil L.
As shown in Figure 1: circuit forms preposition audio amplifier circuit by the first triode VT1, the second triode VT2 and the 3rd triode VT3 form two-stage direct-coupling low-frequency amplifier circuit, L is audio frequency receiving coil, the low frequency signal inducing on audio frequency receiving coil L is coupled to amplifying circuit through the 5th capacitor C 5 and amplifies, loud speaker can send resonant voice, and potentiometer RP is used for regulating volume.
Claims (1)
1. an easy English teaching head circuit, is characterized in that: comprise battery, switch, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, potentiometer, the first triode, the second triode, the 3rd triode, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, audio frequency receiving coil and loud speaker, the anodal while of described battery and the first end of described the 7th resistance, the first end of described the 3rd resistance, the first end of described the second resistance is connected with the first end of described the second electric capacity, the second end while of described the 7th resistance and the first end of described the 6th resistance, the first end of described the 3rd electric capacity is connected with the collector electrode of described the first triode, the second end of described the 6th resistance is connected with the base stage of described the first triode with the first end of described the 5th electric capacity simultaneously, the second end of described the 5th electric capacity connects the first end of described audio frequency receiving coil, the second end of described the 3rd electric capacity connects the first end of described potentiometer, the sliding end of described potentiometer connects the first end of described the 4th electric capacity, the second end of described the 4th electric capacity is connected with the base stage of described the second triode with the first end of described the 4th resistance simultaneously, the second end while of described the 4th resistance and the base stage of described the 3rd triode, the first end of described the first electric capacity, the second end of described the 3rd resistance is connected with the collector electrode of described the second triode, and the emitter-base bandgap grading of described the second triode connects the first end of described the 5th resistance, the second end while of described the second resistance and the first end of described loud speaker, the second end of the collector electrode of described the 3rd triode and described the first electric capacity is connected, the emitter-base bandgap grading of described the 3rd triode connects the first end of described the first resistance, the negative pole of described battery connects the first end of described switch, the second end while of described switch and the second end of described loud speaker, the second end of described the first resistance, the second end of described the second electric capacity, the second end of described the 5th resistance, the second end of described potentiometer, the second end ground connection of the emitter-base bandgap grading of described the first triode and described audio frequency receiving coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320692911.6U CN203537554U (en) | 2013-11-05 | 2013-11-05 | Simple earphone circuit for English teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320692911.6U CN203537554U (en) | 2013-11-05 | 2013-11-05 | Simple earphone circuit for English teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203537554U true CN203537554U (en) | 2014-04-09 |
Family
ID=50423721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320692911.6U Expired - Fee Related CN203537554U (en) | 2013-11-05 | 2013-11-05 | Simple earphone circuit for English teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203537554U (en) |
-
2013
- 2013-11-05 CN CN201320692911.6U patent/CN203537554U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20151105 |
|
| EXPY | Termination of patent right or utility model |