CN211557253U - Audio wireless transmitting device - Google Patents
Audio wireless transmitting device Download PDFInfo
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- CN211557253U CN211557253U CN201921746722.6U CN201921746722U CN211557253U CN 211557253 U CN211557253 U CN 211557253U CN 201921746722 U CN201921746722 U CN 201921746722U CN 211557253 U CN211557253 U CN 211557253U
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Abstract
The utility model relates to an audio wireless transmitting device, which comprises an audio pre-emphasis circuit and an oscillation circuit of FM frequency band; when the circuit is used, the anode of an external audio signal line is connected with an audio pre-emphasis circuit, the audio pre-emphasis circuit compensates and enhances the high-frequency component of the audio signal, and the high-frequency component is added to an oscillation circuit for modulation; the oscillation circuit is used for generating audio signals of an FM frequency band to the air for receiving by a radio; the audio pre-emphasis circuit comprises a first polar capacitor, a second polar capacitor, a first capacitor, an adjustable resistor and a first resistor, the circuit is simple, the cost is low, the size is small, and the tone quality can be changed by adjusting the resistance value of the adjustable resistor; the wireless transmission of the audio signals is realized, and the applicability is wide.
Description
Technical Field
The utility model relates to an audio transmission technical field, more specifically say, relate to an audio frequency wireless transmitting device.
Background
For the old, a radio is also a main listening tool for listening to news, but most of FM frequency band signals transmitted by a signal tower in a remote mountain area cannot be covered or are poor; however, most of the existing televisions do not have a wireless audio transmitting function, and people cannot listen to news live broadcast outdoors, so that a device capable of converting an audio signal output by a television or a satellite set top box into a radio signal of an FM frequency band for a radio to listen to is urgently needed.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a circuit simply, with low costs, small, extensive applicability general audio frequency wireless transmitting device.
The utility model provides a technical scheme that its technical problem adopted is:
an audio wireless transmitting apparatus is constructed, including an audio pre-emphasis circuit and an oscillation circuit of an FM frequency band; the audio pre-emphasis circuit comprises a first polarized capacitor, a second polarized capacitor, a first capacitor, an adjustable resistor and a first resistor; the positive electrode of the first polar capacitor is connected with the positive electrode of an external audio signal line, and the negative electrode of the first polar capacitor is connected with the adjustable resistor; pin 1 of the adjustable resistor is connected with the negative electrode of the first polar capacitor, pin 2 of the adjustable resistor is connected with the negative electrode of the second polar capacitor, and pin 3 of the adjustable resistor is grounded; the positive electrode of the second polar capacitor is connected with the first resistor, and the other end of the first resistor is connected with the oscillating circuit; the first capacitor is connected in parallel with the first resistor.
The utility model discloses an audio frequency wireless transmitting device, wherein, the oscillating circuit includes second electric capacity, first triode and second triode and inductance; the inductor is connected with the positive electrode of the power supply, and the second capacitor is connected with the inductor in parallel; the collector of the first triode and the base of the second triode are connected with the positive electrode of the power supply, and the collector of the second triode and the base of the first triode are connected with the other end of the inductor;
and the collector of the second triode is connected with a third capacitor, and the other end of the third capacitor is connected with a radio frequency antenna.
Audio wireless transmitting device, wherein, the antenna is 50 centimetres long flexible conductor.
Audio wireless transmitting device, wherein, the power is the battery.
The utility model discloses an audio frequency wireless transmitting device, wherein, audio frequency wireless transmitting device still includes power supply circuit, power supply circuit includes three-terminal stabilivolt, first diode and second diode and third diode; the VI end of the three-end voltage-stabilizing tube is connected with the anode of an external power supply, and the GND end of the three-end voltage-stabilizing tube is connected with the cathode of the external power supply and grounded; the VO end of the three-end voltage-stabilizing tube is connected with the anode of the first diode, the cathode of the first diode is connected with the anode of the second diode, the cathode of the second diode is connected with the anode of the third diode, and the cathode of the third diode is respectively connected with the collector electrode of the first triode and the base electrode of the second triode.
Audio wireless transmitting device, wherein, the VI end of three-terminal regulator tube is connected with fourth electric capacity and VO end and all is connected with fifth electric capacity, fourth electric capacity with the equal ground connection of the other end of fifth electric capacity.
Audio wireless transmitting device, wherein, the input voltage of the VI end of three-terminal regulator tube is 5V-35V.
The beneficial effects of the utility model reside in that: when the circuit is used, the anode of an external audio signal line is connected with an audio pre-emphasis circuit, the audio pre-emphasis circuit compensates and enhances the high-frequency component of the audio signal, and the high-frequency component is added to an oscillation circuit for modulation; the oscillation circuit is used for generating audio signals of an FM frequency band to the air for receiving by a radio; the audio pre-emphasis circuit comprises a first polar capacitor, a second polar capacitor, a first capacitor, an adjustable resistor and a first resistor, the circuit is simple, the cost is low, the size is small, and the tone quality can be changed by adjusting the resistance value of the adjustable resistor; the wireless transmission of the audio signals is realized, and the applicability is wide.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work according to the drawings:
fig. 1 is a circuit diagram of an audio pre-emphasis circuit and an oscillation circuit of an audio wireless transmitter according to a preferred embodiment of the present invention;
fig. 2 is a circuit diagram of a power circuit of the audio wireless transmitter according to the preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 shows an audio wireless transmitting apparatus according to a preferred embodiment of the present invention, and also refers to fig. 2; an oscillation circuit 200 including an audio pre-emphasis circuit 100 and an FM band; the audio pre-emphasis circuit 100 comprises a first polar capacitor C4, a second polar capacitor C3, a first capacitor C2, an adjustable resistor RV1 and a first resistor R1; the anode of the first polar capacitor C4 is connected with the anode of an external audio signal line (for example, the audio output anode of a satellite television set-top box, the audio output anode of a digital television set-top box, the audio output anode of a network television set-top box and the audio output anode of a television with audio output can be connected with the anode of the first polar capacitor C4 to input audio signals), and the cathode of the first polar capacitor C4 is connected with the adjustable resistor RV 1; a pin 1 of the adjustable resistor RV1 is connected with the negative electrode of the first polar capacitor C4, a pin 2 of the adjustable resistor RV1 is connected with the negative electrode of the second polar capacitor C3, and a pin 3 of the adjustable resistor RV1 is grounded; the anode of the second polar capacitor C3 is connected to the first resistor R1, and the other end of the first resistor R1 is connected to the oscillation circuit 200; the first capacitor C2 is connected in parallel with the first resistor R1; when in use, the anode of an external audio signal line is connected with the audio pre-emphasis circuit 100, the audio pre-emphasis circuit 100 compensates and enhances the high-frequency component of the audio signal, and the high-frequency component is added to the oscillation circuit 200 for modulation; the oscillating circuit 200 is used for generating audio signals of an FM frequency band to the air for receiving by a radio; the audio pre-emphasis circuit 100 comprises a first polar capacitor C4, a second polar capacitor C3, a first capacitor C2, an adjustable resistor RV1 and a first resistor R1, the circuit is simple, the cost is low, the size is small, and the tone quality can be changed by adjusting the resistance value of the adjustable resistor RV 1; the wireless transmission of the audio signals is realized, and the applicability is wide; the audio signal of the FM frequency band can be received by a radio and a radio of a mobile phone, so that the applicability is wide, and different use requirements are met.
As shown in fig. 1, the oscillating circuit 200 includes a second capacitor C1, a first transistor Q2, a second transistor Q1, and an inductor L1; the inductor L1 is connected with the positive pole of the power supply, and the second capacitor C1 is connected with the inductor L1 in parallel; the collector of the first triode Q2 and the base of the second triode Q1 are connected with the positive pole of the power supply, and the collector of the second triode Q1 and the base of the first triode Q2 are connected with the other end of the inductor L1;
a collector of the second triode Q1 is connected with a third capacitor C5, and the other end of the third capacitor C5 is connected with a radio frequency antenna ANT 1; the circuit is simple, the volume is small, and the cost is low.
As shown in fig. 1, the antenna is a 50 cm long flexible wire; the cost is low.
As shown in fig. 1, the power source is a battery BAT 1; the method is suitable for portable equipment.
As shown in fig. 2, the audio wireless transmitting device further includes a power circuit 300, the power circuit 300 including a three-terminal regulator tube U1, a first diode D1, a second diode D2 and a third diode D3; the VI end of the three-end voltage-stabilizing tube U1 is connected with the anode of an external power supply, and the GND end is connected with the cathode of the external power supply and grounded; the VO end of the three-terminal regulator tube U1 is connected with the anode of a first diode D1, the cathode of the first diode D1 is connected with the anode of a second diode D2, the cathode of the second diode D2 is connected with the anode of a third diode D3, and the cathode of the third diode D3 is connected with the collector of the first triode Q2 and the base of the second triode Q1 respectively; the input voltage of the VI end of the three-end voltage-stabilizing tube U1 is 5V-35V to adapt to different input voltages, so that the three-end voltage-stabilizing tube U1 is suitable for most power adapters to use, and the cost is saved.
As shown in fig. 2, the VI end of the three-terminal regulator tube U1 is connected with a fourth capacitor C7, the VO ends are connected with a fifth capacitor C6, and the other ends of the fourth capacitor C7 and the fifth capacitor C6 are grounded; the output waveform is more stable, and the operation stability of the circuit is improved.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (7)
1. An audio wireless transmitting apparatus includes an audio pre-emphasis circuit and an oscillation circuit of an FM band; the audio pre-emphasis circuit is characterized by comprising a first polar capacitor, a second polar capacitor, a first capacitor, an adjustable resistor and a first resistor; the positive electrode of the first polar capacitor is connected with the positive electrode of an external audio signal line, and the negative electrode of the first polar capacitor is connected with the adjustable resistor; pin 1 of the adjustable resistor is connected with the negative electrode of the first polar capacitor, pin 2 of the adjustable resistor is connected with the negative electrode of the second polar capacitor, and pin 3 of the adjustable resistor is grounded; the positive electrode of the second polar capacitor is connected with the first resistor, and the other end of the first resistor is connected with the oscillating circuit; the first capacitor is connected in parallel with the first resistor.
2. The audio wireless transmitting device according to claim 1, wherein the oscillating circuit comprises a second capacitor, a first transistor and a second transistor, and an inductor; the inductor is connected with the positive electrode of a power supply, and the second capacitor is connected with the inductor in parallel; the collector of the first triode and the base of the second triode are connected with the positive electrode of the power supply, and the collector of the second triode and the base of the first triode are connected with the other end of the inductor;
and the collector of the second triode is connected with a third capacitor, and the other end of the third capacitor is connected with a radio frequency antenna.
3. The audio wireless transmission device of claim 2, wherein the antenna is a 50 cm long flexible wire.
4. The audio wireless transmitting device of claim 2, wherein the power source is a battery.
5. The audio wireless transmitting device according to claim 2, further comprising a power supply circuit comprising a three-terminal regulator tube, a first diode and a second diode, and a third diode; the VI end of the three-end voltage-stabilizing tube is connected with the anode of an external power supply, and the GND end of the three-end voltage-stabilizing tube is connected with the cathode of the external power supply and grounded; the VO end of the three-end voltage-stabilizing tube is connected with the anode of the first diode, the cathode of the first diode is connected with the anode of the second diode, the cathode of the second diode is connected with the anode of the third diode, and the cathode of the third diode is respectively connected with the collector electrode of the first triode and the base electrode of the second triode.
6. The audio wireless transmitting device according to claim 5, wherein a VI end of the three-terminal regulator tube is connected with a fourth capacitor, a VO end of the three-terminal regulator tube is connected with a fifth capacitor, and the other ends of the fourth capacitor and the fifth capacitor are grounded.
7. The audio wireless transmitting device as claimed in claim 5, wherein the input voltage of the VI end of the three-terminal regulator tube is 5V-35V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921746722.6U CN211557253U (en) | 2019-10-18 | 2019-10-18 | Audio wireless transmitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921746722.6U CN211557253U (en) | 2019-10-18 | 2019-10-18 | Audio wireless transmitting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211557253U true CN211557253U (en) | 2020-09-22 |
Family
ID=72498911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921746722.6U Active CN211557253U (en) | 2019-10-18 | 2019-10-18 | Audio wireless transmitting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211557253U (en) |
-
2019
- 2019-10-18 CN CN201921746722.6U patent/CN211557253U/en active Active
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