CN218587321U

CN218587321U - Audio signal returning device using JFET

Info

Publication number: CN218587321U
Application number: CN202222466736.0U
Authority: CN
Inventors: 夏维曦
Original assignee: Tianjin Xinshangzhou Technology Co ltd
Current assignee: Tianjin Xinshangzhou Technology Co ltd
Priority date: 2022-09-18
Filing date: 2022-09-18
Publication date: 2023-03-07
Anticipated expiration: 2032-09-18

Abstract

The utility model relates to an audio signal passback field discloses an use audio signal passback device of JFET, including plug and socket, the socket includes electric capacity, no. two electric capacities and JFET, and electric capacity and No. two electric capacities are parallelly connected to be set up, and electric capacity and No. two electric capacity output series connection are provided with No. two resistances, and No. two resistances and JFET series connection set up, and the JFET drain electrode is established ties in proper order and is provided with No. five electric capacities and No. six electric capacities. The utility model discloses in, the audio signal passback device of an use JFET that proposes, the device can guarantee that the audio signal of passback is lossless, can be reliably discerned by the cell-phone simultaneously, and the device also has audio signal monitoring function, can input outside sound signal simultaneously when having the demand, and the device can realize real high-fidelity audio signal transcription, and cell-phone easy recognition realizes reliable connection and audio signal passback.

Description

Audio signal return device using JFET

Technical Field

The utility model relates to an audio signal passback field especially relates to an use audio signal passback device of JFET.

Background

On some personal computers and intelligent devices, such as android mobile phones, a function of converting an output sound signal into an input sound signal is not provided, sound capture, transmission and recording can only use a microphone of the device to pick up a sound signal played by a loudspeaker, so that external noise can be mixed into the audio signal at the same time, the quality of the input audio signal is poor, the signal-to-noise ratio is reduced, and the requirement of high-quality audio signal input is difficult to meet.

Through retrieval, the prior patent (publication No. CN 211557438U) discloses an audio signal returning method through a jack of an earphone and a microphone, which can utilize a resistance connection to return an audio signal of the earphone to the microphone for input and monitor the returned audio content, but has the problems of signal loss and incapability of identifying a mobile phone, so that external sound signals cannot be input simultaneously when needed.

Disclosure of Invention

The utility model aims at solving the shortcoming that exists among the prior art, and the audio signal passback device who uses JFET that proposes, the device can guarantee that the audio signal of passback is lossless, can be reliably discerned by the cell-phone simultaneously, and the device also has audio signal monitoring function, can input outside sound signal simultaneously when having the demand.

In order to achieve the above purpose, the utility model provides a following technical scheme:

an audio signal return device using a JFET (junction field effect transistor) comprises a plug and a socket, wherein the socket comprises a first capacitor, a second capacitor and a JFET (junction field effect transistor), the first capacitor and the second capacitor are arranged in parallel, the output ends of the first capacitor and the second capacitor are connected in series to form a second resistor, the second resistor and the JFET are arranged in series, and the drain electrode of the JFET is sequentially connected in series with a fifth capacitor and a sixth capacitor;

according to the technical scheme, audio signals of a left sound channel and a right sound channel of the mobile phone are mixed after being isolated by the first capacitor and the second capacitor, so that mutual influence and signal loss between the left sound channel and the right sound channel caused by diameter connection of the left sound channel and the right sound channel are overcome, the second resistor is a driving resistor of the junction field effect transistor, the mixed audio voltage signals are transmitted to a grid electrode of the junction field effect transistor and used as signal input of the junction field effect transistor to control the junction field effect transistor to work normally, the input audio voltage signals are amplified and subjected to impedance conversion by the junction field effect transistor and then are output through the fifth capacitor at a drain electrode, the sixth capacitor is an input capacitor of an external microphone, and the input capacitor is mixed with mobile phone audio signals output by the fifth capacitor and then is transmitted back to a microphone input end of the mobile phone, and the functions of audio signal returning, monitoring and external sound signal input are achieved.

Further, the plug and the socket are electrically connected;

through the technical scheme, the device is simpler in structure, high in reliability and strong in practicability while the audio signal transmission is ensured.

Furthermore, a first resistor is arranged between the output ends of the first capacitor and the second resistor in parallel;

through the technical scheme, the first resistor can stabilize the audio signal load, ensure the reliable operation of the device and improve the practicability.

Further, the source electrode of the junction field effect transistor is grounded;

through above-mentioned technical scheme, effectively protect the JFET, avoid taking place to damage because of the electric current is too big, add the self-protection function for the JFET.

Furthermore, a third capacitor and a fourth capacitor are sequentially arranged between the drain electrode of the junction field effect transistor and the fifth capacitor in parallel, and the third capacitor and the fourth capacitor are both grounded;

through the technical scheme, the third capacitor and the fourth capacitor are both radio-frequency signal filtering capacitors, and radio-frequency signal interference generated when the mobile phone communicates with the outside can be well filtered through grounding, so that the signal-to-noise ratio is improved.

Further, a first resistor is arranged in a grounding mode;

through above-mentioned technical scheme, carry through setting up a resistance ground connection, can make audio signal load stable, guarantee device reliable operation.

Further, the socket is grounded;

through above-mentioned technical scheme, with device surface static or the leakage electric power that probably exists leading-in underground, protection user's physical and mental safety prevents the emergence of unexpected condition.

Furthermore, the plug and the socket are both arranged in the inner recording head;

through the technical scheme, the input functions of audio signal return, monitoring and external sound signals are realized, and meanwhile, the device is more compact in structure, smaller in size, convenient to carry and greatly improved in practicability.

The utility model discloses following beneficial effect has:

1. the utility model provides an use audio signal passback device of JFET, the device can guarantee that the audio signal of passback is lossless, can be reliably discerned by the cell-phone simultaneously, and the device also has audio signal monitoring function, can input outside sound signal simultaneously when having the demand.

2. The utility model provides an use audio signal passback device of JFET, the device plug, socket are all installed in the interior recording, have not only realized audio signal passback, the input function of monitoring and outside sound signal, can make the device structure compacter simultaneously, and the volume is littleer, conveniently carries, and the practicality improves greatly.

3. The utility model provides an use audio signal passback device of JFET, the device has self-protect function, guarantees that audio signal is lossless, undistorted, realizes real high-fidelity audio signal transcription, and the output impedance of audio isolation transformer, output characteristic are consistent with the microphone that the cell-phone used, therefore the cell-phone discerns easily, realizes reliably connecting and audio signal passback.

Drawings

Fig. 1 is a schematic diagram of a socket circuit of an audio signal feedback device using JFETs according to the present invention;

fig. 2 is a schematic structural diagram of a plug of an audio signal feedback device using JFETs according to the present invention.

Illustration of the drawings:

1. a socket; 2. a plug; 101. a fourth capacitor; 102. a third capacitor; 103. a second capacitor; 104. a sixth capacitor; 105. a fifth capacitor; 106. a junction field effect transistor; 107. a second resistor; 108. a first capacitor; 109. a first resistor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides an embodiment: an audio signal return device using a JFET (junction field effect transistor) comprises a plug 2 and a socket 1, and is compact in structure, small in size and convenient to carry, wherein the socket 1 comprises a first capacitor 108, a second capacitor 103 and a JFET 106, the first capacitor 108 and the second capacitor 103 are arranged in parallel, the output ends of the first capacitor 108 and the second capacitor 103 are connected in series with a second resistor 107, the second resistor 107 and the JFET 106 are connected in series, and the drain electrode of the JFET 106 is sequentially connected in series with a fifth capacitor 105 and a sixth capacitor 104;

through the technical scheme, audio signals of the left and right sound channels of the mobile phone are mixed after being isolated by the first capacitor 108 and the second capacitor 103, so that mutual influence and signal loss between the left sound channel and the right sound channel caused by diameter connection of the left sound channel and the right sound channel are overcome, the second resistor 107 is a driving resistor of the junction field effect transistor 106, the mixed audio voltage signal is sent to the grid electrode of the junction field effect transistor 106 and is used as signal input of the junction field effect transistor 106, the junction field effect transistor 106 controls the junction field effect transistor 106 to work normally, the input audio voltage signal is amplified and subjected to impedance conversion by the junction field effect transistor 106 and then output through the fifth capacitor 105 at the drain electrode, the sixth capacitor 104 is an input capacitor of an external microphone, and the sixth capacitor is mixed with the mobile phone audio signal output through the fifth capacitor 105 and then sent back to the microphone input end of the mobile phone, and the functions of audio signal returning, monitoring and external sound signal input are realized.

Plug 2 and socket 1 electric connection, when guaranteeing audio signal propagation, make the device structure simpler, high reliability, the practicality is strong, parallelly connected between electric capacity 108 and No. two electric capacity 103 output and No. two resistance 107 and be provided with resistance 109, resistance 109 can make the audio signal load stable, guarantee the device reliable operation, improve the practicality, JFET 106 source ground connection sets up, effectively protect JFET 106, avoid damaging because of the too big emergence of electric current, for JFET 106 adds the self-protection function, connect in parallel in proper order between JFET 106 drain electrode and No. five electric capacity 105 and be provided with No. three electric capacity 102 and No. four electric capacity 101, no. three electric capacity 102 and No. four electric capacity 101 all ground connection sets up, no. three electric capacity 102 and No. four electric capacity 101 are the radio frequency signal filter electric capacity, through ground connection sets up, can well filter the radio frequency signal interference when the cell-phone communicates outward, improve the signal-to-noise ratio, resistance ground connection sets up, lead into the device surface 109 static or the electric power of revealing that may exist underground, protect user's mind safety, prevent the emergence of unexpected condition, plug 2, the plug 1 is all installed in the interior recording, realize the audio signal monitoring, the compact back, and the volume of the sound input device is greatly improved, and the practicality is greatly, and the volume is more convenient to carry is improved.

The working principle is as follows: the first capacitor 108 and the second capacitor 103 mix audio signals of left and right sound channels of the mobile phone after isolating direct current, the second resistor 107 is a driving resistor of the junction field effect transistor 106, the mixed audio voltage signal is sent to a grid electrode of the junction field effect transistor 106 to be used as signal input of the junction field effect transistor 106 to control the junction field effect transistor 106 to work normally, the junction field effect transistor 106 amplifies and impedance-converts the input audio voltage signal and outputs the signal through the fifth capacitor 105 at a drain electrode, the sixth capacitor 104 is an input capacitor of an external microphone, and the sixth capacitor 104 is mixed with the mobile phone audio signal output through the fifth capacitor 105 and then sends the signal back to a microphone input end of the mobile phone, so that the functions of audio signal return, monitoring and external sound signal input are realized.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. An audio signal feedback device using JFET, comprising a plug (2) and a socket (1), characterized in that: socket (1) includes a electric capacity (108), no. two electric capacities (103) and junction field effect transistor (106), an electric capacity (108) and No. two electric capacities (103) parallel arrangement, an electric capacity (108) and No. two electric capacities (103) output is established ties and is provided with No. two resistance (107), no. two resistance (107) and junction field effect transistor (106) are established ties and are set up, junction field effect transistor (106) drain electrode is established ties in proper order and is provided with No. five electric capacities (105) and No. six electric capacities (104).

2. The audio signal postback device using JFET of claim 1, wherein: the plug (2) is electrically connected with the socket (1).

3. The audio signal postback device using JFET of claim 1, wherein: a first resistor (109) is arranged between the output ends of the first capacitor (108) and the second capacitor (103) and the second resistor (107) in parallel.

4. The audio signal feedback device using JFET of claim 1, the method is characterized in that: the source electrode of the junction type field effect transistor (106) is grounded.

5. The audio signal feedback device using JFET of claim 1, the method is characterized in that: a third capacitor (102) and a fourth capacitor (101) are sequentially arranged between the drain electrode of the junction field effect transistor (106) and the fifth capacitor (105) in parallel, and the third capacitor (102) and the fourth capacitor (101) are all grounded.

6. The device of claim 3, wherein the JFET further comprises: the first resistor (109) is arranged at the ground.

7. The audio signal feedback device using JFET of claim 1, the method is characterized in that: the socket (1) is grounded.

8. The audio signal feedback device using JFET of claim 1, the method is characterized in that: the plug (2) and the socket (1) are both installed in the inner recording head.