CN206547190U - A kind of wireless microphone for eliminating acoustic feedback - Google Patents
A kind of wireless microphone for eliminating acoustic feedback Download PDFInfo
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- CN206547190U CN206547190U CN201720183435.3U CN201720183435U CN206547190U CN 206547190 U CN206547190 U CN 206547190U CN 201720183435 U CN201720183435 U CN 201720183435U CN 206547190 U CN206547190 U CN 206547190U
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- electric capacity
- resistance
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- type triode
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Abstract
The utility model is related to a kind of wireless microphone for eliminating acoustic feedback, wherein the second NPN type triode T2 and its peripheral element constitute high-frequency generator of the frequency in the range of 88~108MHz, the audio signal of Electret condenser microphone pickup is first amplified through T1, and the low frequency signal after amplification is modulated to high frequency carrier again.After circuit is debug, received with FM sections of FM receivers, effectively transmission radius is up to 500m.The utility model does not produce amplitude modulation(PAM), and distortion is small, and transmission range is remote, and working stability, circuit is simply easily made, and can be worked as long as welding is errorless.
Description
Technical field
The utility model is related to electronic communication technology field, more particularly to a kind of wireless microphone for eliminating acoustic feedback.
Background technology
Wireless microphone is a kind of equipment that sound is transmitted by way of radio wave or others, and conventional wireless microphone is in language
Acoustic feedback is easily produced in sound transmitting procedure, causes voice distortion, transmission range is limited, job insecurity.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of wireless microphone for eliminating acoustic feedback, existing to solve
Deficiency in technology.
In order to achieve the above object, the purpose of this utility model is achieved through the following technical solutions：
A kind of wireless microphone for eliminating acoustic feedback, including first resistor, second resistance, 3rd resistor, the 4th electricity are provided
Resistance, the 5th resistance, the 6th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity,
Seven electric capacity, the 8th electric capacity, the first NPN type triode, the second NPN type triode, microphone, diode, the first inductance, the second electricity
Sense and antenna, first electric capacity are electrochemical capacitor, and first inductance is iron inductance, and second inductance is adjustable electric
Sense, one end of the microphone, the emitter stage of first NPN type triode, one end of the 5th resistance, the diode
Positive pole, one end of the 5th electric capacity, the emitter stage of second NPN type triode, the 7th electric capacity and the described 8th
One end of electric capacity is grounded respectively, and the other end of the microphone connects one end of the first resistor and first electric capacity respectively
Positive pole, the negative pole of first electric capacity connects one end of the second resistance and the base stage of first NPN type triode, institute respectively
The colelctor electrode for stating the first NPN type triode connects one end of the 3rd resistor and one end of the 4th resistance, described respectively
The other end of four resistance meets the one of the other end, the negative pole of the diode and the 3rd electric capacity of the 5th resistance respectively
End, the other end of the 3rd electric capacity meets one end of the 4th electric capacity, the other end of the 5th electric capacity, the described 6th respectively
One end of resistance and the base stage of second NPN type triode, the other end of the 8th electric capacity, the first resistor it is another
End, the other end of the other end of the second resistance, the 3rd resistor connect external power source and first inductance respectively
One end, the other end of first inductance connects the other end of the 4th electric capacity respectively, one end of the 6th electric capacity, described
One end of second inductance and the antenna, the other end of the 6th electric capacity connect the other end of second inductance, institute respectively
State the other end of the other end, the colelctor electrode of second NPN type triode and the 7th electric capacity of the 6th resistance.
The above-mentioned wireless microphone for eliminating acoustic feedback, wherein, second NPN type triode uses FF501.
Compared with the prior art, the beneficial effects of the utility model are：
Amplitude modulation(PAM) is not produced, distortion is small, transmission range is remote, and working stability, circuit is simply easily made, as long as welding is errorless i.e.
It can work.
Brief description of the drawings
Constitute a part of accompanying drawing of the present utility model to be used for providing further understanding to of the present utility model, this practicality is new
The schematic description and description of type is used to explain the utility model, does not constitute to improper restriction of the present utility model.
In accompanying drawing：
Fig. 1 shows that the utility model can eliminate the structural representation of the wireless microphone of acoustic feedback.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the utility model can
To be mutually combined.
With reference to shown in Fig. 1, the wireless microphone that the utility model can eliminate acoustic feedback includes first resistor R1, second resistance
R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity
C3, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8, the first NPN type triode T1,
Second NPN type triode T2, microphone M, diode D1, the first inductance L1, the second inductance L2 and antenna ANT, the first electric capacity C1
For electrochemical capacitor, the first inductance L1 is iron inductance, and the second inductance L2 is controllable impedance, microphone M one end, the first NPN type
Triode T1 emitter stage, the 5th resistance R5 one end, diode D1 positive pole, the 5th electric capacity C5 one end, the second NPN type three
One end of pole pipe T2 emitter stage, the 7th electric capacity C7 and the 8th electric capacity C8 is grounded respectively, and the microphone M other end connects first respectively
Resistance R1 one end and the first electric capacity C1 positive pole, the first electric capacity C1 negative pole connect second resistance R2 one end and first respectively
NPN type triode T1 base stage, the first NPN type triode T1 colelctor electrode connects 3rd resistor R3 one end and the 4th resistance respectively
R4 one end, the 4th resistance R4 other end connects the 5th resistance the R5 other end, diode D1 negative pole and the 3rd electric capacity respectively
C3 one end, the 3rd electric capacity C3 other end connects the 4th electric capacity C4 one end, the 5th electric capacity C5 other end, the 6th resistance respectively
R6 one end and the second NPN type triode T2 base stage, the 8th electric capacity C8 other end, the first resistor R1 other end, second
The resistance R2 other end, the 3rd resistor R3 other end connect external power source Vcc (+9V) and the first inductance L1 one end respectively,
The first inductance L1 other end connects the 4th electric capacity C4 other end, the 6th electric capacity C6 one end, the one of the second inductance L2 respectively
End and antenna ANT, the 6th electric capacity the C6 other end connect respectively the second inductance L2 other end, the 6th resistance R6 other end,
Second NPN type triode T2 colelctor electrode and the 7th electric capacity C7 other end.In the technical program, the second NPN type triode T2
Using FF501, using the T0-92 encapsulation (as 9000 serial triodes) of standard, its Icm is 45mA, and fT is more than
1.3GHz, Vceo are 13V, and the advantage of dedicated pipe is exactly that uniformity is good, and radio frequency power output is larger, and circuit is easily adjusted, FF501
Higher frequency range can be operated in completely.Second NPN type triode T2 and its peripheral element constitute a frequency in 88~108MHz scopes
Interior high-frequency generator, the audio signal of Electret condenser microphone pickup is first amplified through T1, and the low frequency signal after amplification is again to height
Frequency carrier wave is modulated.Music signal can be transmitted well if microphone M is in input termination cassette player output.L2 in circuit
0.8cm is elongated to around 5 circle tread flakings on diameter 5.1mm drill bit with diameter 1.0mm enamel-covered wire, C3~C8 can be situated between with high frequency porcelain
Electric capacity, the most handy 1.2m of antenna ANT pull bar simultaneously vertically puts vertical.Antenna ANT must frame it is good after upper electricity again.The work electricity of circuit
Flow about 25 ± 5mA.Such as tranmitting frequency can suitably adjust resonance coil L2 length not in the range of 88~108MHz.Circuit is filled
After mixing up, received with FM sections of FM receivers, effectively transmission radius is up to 500m.
From above-described embodiment as can be seen that advantage of the present utility model is：
Amplitude modulation(PAM) is not produced, distortion is small, transmission range is remote, and working stability, circuit is simply easily made, as long as welding is errorless i.e.
It can work.
Specific embodiment of the utility model is described in detail above, but the utility model is not restricted to the above
The specific embodiment of description, it is intended only as example.To those skilled in the art, any equivalent modifications and substitute also all
Among category of the present utility model.Therefore, the impartial conversion made in the case where not departing from spirit and scope of the present utility model
And modification, it should all cover in the range of the utility model.
Claims (2)
1. a kind of wireless microphone for eliminating acoustic feedback, it is characterised in that including first resistor, second resistance, 3rd resistor,
Four resistance, the 5th resistance, the 6th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electricity
Appearance, the 7th electric capacity, the 8th electric capacity, the first NPN type triode, the second NPN type triode, microphone, diode, the first inductance,
Second inductance and antenna, first electric capacity are electrochemical capacitor, and first inductance is iron inductance, and second inductance is can
Adjust inductance, one end of the microphone, the emitter stage of first NPN type triode, one end of the 5th resistance, described two
The positive pole of pole pipe, one end of the 5th electric capacity, the emitter stage of second NPN type triode, the 7th electric capacity and described
One end of 8th electric capacity is grounded respectively, and the other end of the microphone connects one end of the first resistor and first electricity respectively
The positive pole of appearance, the negative pole of first electric capacity connects one end of the second resistance and the base of first NPN type triode respectively
Pole, the colelctor electrode of first NPN type triode connects one end of the 3rd resistor and one end of the 4th resistance, institute respectively
The other end for stating the 4th resistance connects the other end, the negative pole of the diode and the 3rd electric capacity of the 5th resistance respectively
One end, the other end of the 3rd electric capacity connects one end of the 4th electric capacity, the other end of the 5th electric capacity, described respectively
One end of six resistance and the base stage of second NPN type triode, the other end of the 8th electric capacity, the first resistor it is another
One end, the other end of the second resistance, the other end of the 3rd resistor connect external power source and first inductance respectively
One end, the other end of first inductance connects the other end of the 4th electric capacity, one end of the 6th electric capacity, institute respectively
State one end of the second inductance and the antenna, the other end of the 6th electric capacity connect respectively the other end of second inductance,
The other end of the other end of 6th resistance, the colelctor electrode of second NPN type triode and the 7th electric capacity.
2. the wireless microphone of acoustic feedback can be eliminated as claimed in claim 1, it is characterised in that second NPN type triode is adopted
Use FF501.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720183435.3U CN206547190U (en) | 2017-02-28 | 2017-02-28 | A kind of wireless microphone for eliminating acoustic feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720183435.3U CN206547190U (en) | 2017-02-28 | 2017-02-28 | A kind of wireless microphone for eliminating acoustic feedback |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206547190U true CN206547190U (en) | 2017-10-10 |
Family
ID=59994246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720183435.3U Expired - Fee Related CN206547190U (en) | 2017-02-28 | 2017-02-28 | A kind of wireless microphone for eliminating acoustic feedback |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206547190U (en) |
-
2017
- 2017-02-28 CN CN201720183435.3U patent/CN206547190U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171010 Termination date: 20210228 |