CN104301841A - Simple wireless microphone circuit - Google Patents
Simple wireless microphone circuit Download PDFInfo
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- CN104301841A CN104301841A CN201410511955.3A CN201410511955A CN104301841A CN 104301841 A CN104301841 A CN 104301841A CN 201410511955 A CN201410511955 A CN 201410511955A CN 104301841 A CN104301841 A CN 104301841A
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Abstract
A simple wireless microphone circuit comprises a resistor R1, capacitors C1-C5, an inductor L1, an inductor L2, a switch S1, a power source and a triode Q1. A positive electrode of the power source is connected with the first end of the switch S1, the second end of the switch S1 is connected with a base electrode of the triode Q1 through the capacitor C1, the base electrode of the triode Q1 is connected with the biasing resistor R1, the other end of the biasing resistor R1 is connected with the power source through the switch S1, a collector electrode of the triode is connected with the capacitor C2, the inductor L2 and the capacitor C3, the other end of the capacitor C2 and the other end of the inductor L1 are connected with the power source through the switch S1, the other end of the capacitor C3 is connected with an emitter electrode of the triode Q1, the emitter electrode of the triode is connected with a microphone MIC, the microphone MIC is connected with a negative electrode of the power source, the capacitor C5 is connected with the two ends of the power source, the emitter electrode of the triode Q1 is connected with the capacitor C4, the capacitor C4 is connected with the inductor L2, and the inductor L2 is connected with an antenna.
Description
Technical field
The present invention relates to a kind of plain type wireless microphone circuit.
Background technology
For wireless microphone in the market, dragons and fishes jumbled together, ordinary consumer consumption cannot divide other present situation again, and a frequency is more stable, transmitting range is distant, the wireless microphone that can meet various different demand is that consumers in general thirsted for, common wireless microphone is the output frequency that junction capacitance conversion between the collector electrode of transistor by changing oscillating circuit and base stage changes oscillator, thus realize being modulated into frequency-modulated wave to frequency of oscillation, by high frequency frequency selection circuit and amplifying circuit, finally by antenna to external radiation.For wireless microphone in the market, dragons and fishes jumbled together, ordinary consumer consumption cannot divide other present situation again, and a frequency is more stable, transmitting range is distant, the wireless microphone that can meet various different demand is that consumers in general thirsted for, common wireless microphone is the output frequency that junction capacitance conversion between the collector electrode of transistor by changing oscillating circuit and base stage changes oscillator, thus realize being modulated into frequency-modulated wave to frequency of oscillation, by high frequency frequency selection circuit and amplifying circuit, finally by antenna to external radiation.
Summary of the invention
This is practical new for overcome above-mentioned existing technical deficiency, provides a kind of structure simple, with low cost, can avoid a kind of plain type wireless microphone circuit of audio signal through the problem of dtmf distortion DTMF of coupling capacitance.
The present invention to achieve these goals concrete by the following technical solutions:
A kind of plain type wireless microphone circuit, it is characterized in that, comprise resistance R1, electric capacity C1-C5, inductance L 1-L2, switch S 1, power supply, triode Q1, positive source connecting valve S1 first end, second end of switch S 1 passes through the base stage of electric capacity C1 connecting triode Q1, the base stage of triode Q1 connects biasing resistor R1, the other end of biasing resistor R1 connects power supply by switch S 1, the collector electrode of triode connects electric capacity C2, inductance L 1, electric capacity C3, electric capacity C2, the other end of inductance L 1 connects power supply by switch S 1, the emitter of the other end connecting triode Q1 of electric capacity C3, the emitter of triode is connected with microphone MIC, microphone MIC connects power cathode, electric capacity C5 is connected to both ends of power, the emitter of triode Q1 connects electric capacity C4, electric capacity C4 connects inductance L 2, inductance L 2 is connected with antenna.
Beneficial effect of the present invention is as follows:
Microphone signal of the present invention inputs from transistor base unlike the past, but microphone is connected on emitter, when microphone self inductance current is with sound size variation, the operating current of Q1 also can change thereupon, Cbe variate is simultaneously held in Q1 economize on electricity, in parallel with LC loop again after Cbe and C1 series connection, therefore, achieve frequency modulation.This connection of MIC completely avoid the distortion of audio signal through coupling capacitance, and therefore, the Hz-KHz of this microphone is wide, and tonequality is pure, working stability, even if hand touches antenna also can not affect LC frequency of oscillation.
Accompanying drawing explanation
Fig. 1 is circuit structure diagram of the present invention.
Embodiment
Operation principle: the operation principle of this microphone is substantially identical with common wireless microphone circuit, but line and acoustical quality have improvement greatly.Circuit is shown in that accompanying drawing 1, Q1 and L1, C2, C3 etc. form FM high-frequency oscillating circuits, and adjustment L1, C2 value can change operating frequency.C3 is the feedback capacity maintaining vibration.Microphone signal inputs from transistor base unlike the past, but microphone is connected on emitter, when microphone self inductance current is with sound size variation, the operating current of Q1 also can change thereupon, Cbe variate is simultaneously held in Q1 economize on electricity, in parallel with LC loop again after Cbe and C1 series connection, therefore, achieve frequency modulation.This connection of MIC completely avoid the distortion of audio signal through coupling capacitance, and therefore, the Hz-KHz of this microphone is wide, and tonequality is pure, working stability, even if hand touches antenna also can not affect LC frequency of oscillation.
Element is selected to make: oscillating tube Q1 selection fT>1000MHz, Icm >=100Ma, the high-frequency tube that β value is larger, as C3355, C3358, BFR96 etc.The Icm of 9018 only has 50mA, but can select according to actual; MIC selects the moving-coil microphone of 600 Ω, and current medium-to-high grade cable microphone mostly is this type of; L1 internal diameter is 5mm, forms around 5T with Φ 0.5mm enamelled wire hollow; Transmitting antenna directly can use finished antenna, also can make by oneself: coiler part internal diameter is 1cm, and hollow also elongates to 3cm around 15T, and straight extending portion is divided into 7cm, loads onto heating form with pyrocondensation gum cover, also can replace with the flexible conductor of an about 10cm.
Installation and debugging: element installs, check errorless after, switch on power, make receiver by a pocket FM receiver.It should be noted that and therefore, mains switch must be installed the VCD severe jamming reception that band radio frequency exports additional to radio-frequency modulator, use AV terminal broadcast program.Regulate FM receiver and L1 pitch of turn, make transmitting-receiving frequency corresponding, if desired by C2 switching value.The audio signal that broadcast receiver exports is transported to VCD by large plug or sound amplifier carries out power amplification.Transmitting range and wireless sensitivity have much relations, but general all >=10 meters.
Claims (1)
1. a plain type wireless microphone circuit, it is characterized in that, comprise resistance R1, electric capacity C1-C5, inductance L 1-L2, switch S 1, power supply, triode Q1, positive source connecting valve S1 first end, second end of switch S 1 passes through the base stage of electric capacity C1 connecting triode Q1, the base stage of triode Q1 connects biasing resistor R1, the other end of biasing resistor R1 connects power supply by switch S 1, the collector electrode of triode connects electric capacity C2, inductance L 1, electric capacity C3, electric capacity C2, the other end of inductance L 1 connects power supply by switch S 1, the emitter of the other end connecting triode Q1 of electric capacity C3, the emitter of triode is connected with microphone MIC, microphone MIC connects power cathode, electric capacity C5 is connected to both ends of power, the emitter of triode Q1 connects electric capacity C4, electric capacity C4 connects inductance L 2, inductance L 2 is connected with antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410511955.3A CN104301841A (en) | 2014-09-29 | 2014-09-29 | Simple wireless microphone circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410511955.3A CN104301841A (en) | 2014-09-29 | 2014-09-29 | Simple wireless microphone circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104301841A true CN104301841A (en) | 2015-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410511955.3A Pending CN104301841A (en) | 2014-09-29 | 2014-09-29 | Simple wireless microphone circuit |
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| CN (1) | CN104301841A (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093953A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Intelligent household wireless induction type bracelet voice acquisition apparatus |
| CN105093954A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Intelligent household wireless induction type bracelet type voice acquisition apparatus employing hybrid energy |
| CN105093955A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Voice instruction acquisition system of intelligent household ecological system |
| CN105093951A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Intelligent household ecological system |
| CN105093957A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Intelligent household infrared module employing bracelet |
| CN105100734A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Smart audio video mixed acquisition device adopting wireless induction charging wristband |
| CN105093956A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Intelligent household infrared module employing wireless induction charging type bracelet |
| CN105137795A (en) * | 2015-08-31 | 2015-12-09 | 成都科创城科技有限公司 | Smart home hybrid energy supply collection device employing wireless charging bracelet |
| CN105141024A (en) * | 2015-08-31 | 2015-12-09 | 成都科创城科技有限公司 | Smart home ecological system employing bracelet collection instruction |
| CN105137797A (en) * | 2015-08-31 | 2015-12-09 | 成都科创城科技有限公司 | Smart home ecological system with multiple voice signal collection devices |
| CN105137794A (en) * | 2015-08-31 | 2015-12-09 | 成都科创城科技有限公司 | Receiving end of voice collection device for smart home centralized control system |
| CN105137793A (en) * | 2015-08-31 | 2015-12-09 | 成都科创城科技有限公司 | Smart home ecological system voice instruction collection device employing mobile bracelet |
| CN105137791A (en) * | 2015-08-31 | 2015-12-09 | 成都科创城科技有限公司 | Intelligent bracelet for solar intelligent smart home system |
| CN105162237A (en) * | 2015-08-31 | 2015-12-16 | 成都科创城科技有限公司 | Intelligent home system for bracelet-type multi-speech signal collection device |
| CN105187284A (en) * | 2015-08-31 | 2015-12-23 | 成都科创城科技有限公司 | Intelligent household audio-video hybrid collection device adopting mobile bracelet |
| CN105182771A (en) * | 2015-08-31 | 2015-12-23 | 成都科创城科技有限公司 | Bracelet voice order collection device of intelligent household system employing hybrid energy |
| CN105223816A (en) * | 2015-08-31 | 2016-01-06 | 成都科创城科技有限公司 | A kind of harvester adopting the Smart Home energy mix of mobile bracelet to power |
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| US6104818A (en) * | 1996-04-22 | 2000-08-15 | Dalloz Safety Ab | Microphone circuit |
| CN102158776A (en) * | 2011-04-28 | 2011-08-17 | 陈子杨 | Frequency-modulation wireless microphone made of single battery |
| CN104065389A (en) * | 2013-03-19 | 2014-09-24 | 成都凯智科技有限公司 | Wireless control signal emitter applied to parking charge system |
| CN204231641U (en) * | 2014-09-29 | 2015-03-25 | 成都英博联宇科技有限公司 | A kind of plain type wireless microphone circuit |
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2014
- 2014-09-29 CN CN201410511955.3A patent/CN104301841A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6104818A (en) * | 1996-04-22 | 2000-08-15 | Dalloz Safety Ab | Microphone circuit |
| CN102158776A (en) * | 2011-04-28 | 2011-08-17 | 陈子杨 | Frequency-modulation wireless microphone made of single battery |
| CN104065389A (en) * | 2013-03-19 | 2014-09-24 | 成都凯智科技有限公司 | Wireless control signal emitter applied to parking charge system |
| CN204231641U (en) * | 2014-09-29 | 2015-03-25 | 成都英博联宇科技有限公司 | A kind of plain type wireless microphone circuit |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093953A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Intelligent household wireless induction type bracelet voice acquisition apparatus |
| CN105093954A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Intelligent household wireless induction type bracelet type voice acquisition apparatus employing hybrid energy |
| CN105093955A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Voice instruction acquisition system of intelligent household ecological system |
| CN105093951A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Intelligent household ecological system |
| CN105093957A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Intelligent household infrared module employing bracelet |
| CN105100734A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Smart audio video mixed acquisition device adopting wireless induction charging wristband |
| CN105093956A (en) * | 2015-08-31 | 2015-11-25 | 成都科创城科技有限公司 | Intelligent household infrared module employing wireless induction charging type bracelet |
| CN105137795A (en) * | 2015-08-31 | 2015-12-09 | 成都科创城科技有限公司 | Smart home hybrid energy supply collection device employing wireless charging bracelet |
| CN105141024A (en) * | 2015-08-31 | 2015-12-09 | 成都科创城科技有限公司 | Smart home ecological system employing bracelet collection instruction |
| CN105137797A (en) * | 2015-08-31 | 2015-12-09 | 成都科创城科技有限公司 | Smart home ecological system with multiple voice signal collection devices |
| CN105137794A (en) * | 2015-08-31 | 2015-12-09 | 成都科创城科技有限公司 | Receiving end of voice collection device for smart home centralized control system |
| CN105137793A (en) * | 2015-08-31 | 2015-12-09 | 成都科创城科技有限公司 | Smart home ecological system voice instruction collection device employing mobile bracelet |
| CN105137791A (en) * | 2015-08-31 | 2015-12-09 | 成都科创城科技有限公司 | Intelligent bracelet for solar intelligent smart home system |
| CN105162237A (en) * | 2015-08-31 | 2015-12-16 | 成都科创城科技有限公司 | Intelligent home system for bracelet-type multi-speech signal collection device |
| CN105187284A (en) * | 2015-08-31 | 2015-12-23 | 成都科创城科技有限公司 | Intelligent household audio-video hybrid collection device adopting mobile bracelet |
| CN105182771A (en) * | 2015-08-31 | 2015-12-23 | 成都科创城科技有限公司 | Bracelet voice order collection device of intelligent household system employing hybrid energy |
| CN105223816A (en) * | 2015-08-31 | 2016-01-06 | 成都科创城科技有限公司 | A kind of harvester adopting the Smart Home energy mix of mobile bracelet to power |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150121 |
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| WD01 | Invention patent application deemed withdrawn after publication |