CN202004963U - Frequency modulation wireless microphone manufactured by muPC1651 integrated circuit - Google Patents
Frequency modulation wireless microphone manufactured by muPC1651 integrated circuit Download PDFInfo
- Publication number
- CN202004963U CN202004963U CN2011200776457U CN201120077645U CN202004963U CN 202004963 U CN202004963 U CN 202004963U CN 2011200776457 U CN2011200776457 U CN 2011200776457U CN 201120077645 U CN201120077645 U CN 201120077645U CN 202004963 U CN202004963 U CN 202004963U
- Authority
- CN
- China
- Prior art keywords
- circuit
- frequency modulation
- integrated circuit
- frequency
- wireless microphone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model belongs to the field of application of electronic technique and wireless communication and relates to a frequency modulation wireless microphone manufactured by a muPC1651 integrated circuit. The frequency modulation wireless microphone consists of a direct current (DC) power supply, an audio frequency signal pick-up circuit, a high-frequency oscillator and transmitting circuit, a negative feedback circuit and a transmitting antenna AT; the frequency modulation wireless microphone is characterized in that: the model of the integrated circuit IC1 in the high-frequency oscillator frequency-modulation and transmitting circuit is muPC1651. In the utility model, the disadvantages that most of the wireless microphones in the market have more elements and complex circuit structures are overcome. The frequency modulation wireless microphone in the utility model adopts the muPC1651 integrated circuit produced by the NEC (Nippon Electric Company) as a main device in the circuit, the transmitting frequency can be selected in a frequency modulation wave band from 88MHz to 108MHz, and signals can be received by a common frequency modulation radio. The frequency modulation wireless microphone has the advantages that the circuit structure is simple, the using elements are few, the manufacturing is easy, the debugging is simple and convenient and the working is stable and the like.
Description
Technical field
The utility model belongs to application of electronic technology and wireless communication field, is about a kind of frequency modulation wireless microphone with μ PC1651 production of integrated circuits.
Background technology
Operation principle at frequency modulation wireless microphone on the market is to realize frequency modulation by the junction capacitance that changes between transistorized base stage and the emitter, when the sound voltage signal is added to transistorized base stage, the capacity of junction capacitance can change synchronously along with the size of sound voltage between transistorized base stage and the emitter, transistorized tranmitting frequency is also changed thereupon, and then realize modulation frequency.It is to adopt LC oscillator or quartz crystal oscillator circuit to constitute that a lot of frequency modulation wireless microphones are also arranged.
Frequency modulation wireless microphone described in the utility model adopts the integrated circuit μ PC1651 of Japanese NEC Corporation production as main devices, its a kind of high performance ultrahigh frequency broadband, low noise amplification circuit, tranmitting frequency can be selected in the fm band of 88～108MHz, and signal can receive by common FM receiver.This frequency modulation wireless microphone have circuit structure succinct, use components and parts few, make easily, easy, the steady operation and other merits of debugging.
Describe this frequency modulation wireless microphone below in detail and make related relevant technologies content with μ PC1651 production of integrated circuits.
The utility model content
Goal of the invention and beneficial effect: the purpose of this utility model is to have overcome most on the market wireless microphones to exist defectives such as using element is many, circuit structure more complicated.Frequency modulation wireless microphone described in the utility model adopts the main devices of the integrated circuit μ PC1651 of Japanese NEC Corporation production as circuit, and tranmitting frequency can be selected in the fm band of 88～108MHz, and signal can receive with common FM receiver.This frequency modulation wireless microphone have circuit structure succinct, use components and parts few, make easily, easy, the steady operation and other merits of debugging.
Technical scheme: with the frequency modulation wireless microphone of μ PC1651 production of integrated circuits, be made up of DC power supply DC, audio signal pick-up circuit, high-frequency generator and radiating circuit, negative-feedback circuit and transmitting antenna AT, it is characterized in that: the model of integrated circuit (IC) 1 is μ PC1651 in high-frequency generator and the radiating circuit.
Connection features in the composition of each several part circuit and the circuit between the components and parts
Audio signal pick-up circuit: the positive pole of the output termination electrochemical capacitor C1 of electret capacitor microphone MIC and an end of resistance R 1, the anodal VCC of another termination DC power supply DC of resistance R 1, the shell connection circuit ground GND of electret capacitor microphone MIC.
High-frequency generator and radiating circuit: form by integrated circuit (IC) 1, oscillator coil L1, variable capacitance CP, capacitor C 4 and transmitting antenna AT, 2 pin of integrated circuit (IC) 1 connect the negative pole of electrochemical capacitor C1,4 pin of integrated circuit (IC) 1 connect the end of oscillator coil L1 and an end of capacitor C 4, antenna AT is penetrated in the other end sending and receiving of capacitor C 4, connection circuit ground GND behind the other end serial connection variable capacitance CP of oscillator coil L1,1 pin of integrated circuit (IC) 1 meets the anodal VCC of DC power supply DC, 3 pin connection circuit ground GND of integrated circuit (IC) 1.
Negative-feedback circuit: 4 pin that connect integrated circuit (IC) 1 after the 2 pin serial connection capacitor C 3 of integrated circuit (IC) 1.
The circuit working principle: the core devices of the utility model circuit is a μ PC1651 integrated circuit, constitutes frequency-modulated generator and modulating emission circuit by itself and peripheral cell.The audio signal of electret capacitor microphone MIC output is coupled to μ pc1651 integrated circuit through electrochemical capacitor C1 high-frequency oscillation signal is carried out frequency modulation(FM), and FM signal is coupled to transmitting antenna AT through capacitor C 4.It is high that this circuit has gain, working stability, and characteristics such as simple for production, that cost is low, draw materials easily can guarantee the performance of electret capacitor microphone MIC.
Description of drawings
Accompanying drawing is that the utility model provides an embodiment circuit working schematic diagram with the frequency modulation wireless microphone of μ PC1651 production of integrated circuits.The shell of electret capacitor microphone MIC requires connection circuit ground GND.
Embodiment
Implement according to the circuit working schematic diagram of the frequency modulation wireless microphone of using μ PC1651 production of integrated circuits shown in the accompanying drawing and the components and parts specification requirement of description of drawings and the following stated, can realize the utility model.
The selection of components and parts and technical parameter thereof
IC1 is a high-performance, ultrahigh frequency broadband, low noise amplification circuit for μ PC1651, include dual-stage amplifier, it has 4 pins to be respectively: input, output, positive source, power cathode, and the longest pin of integrated circuit μ PC1651 is an output, its sequence number is the 4th pin; When connecing the work of 5V DC power supply, its static working current is about 23mA.
Resistance uses RTX-1/8W type metalfilmresistor, the resistance 4.7K Ω of resistance R 1.
C1 selects the CD11-16V electrochemical capacitor for use, and capacity is 4.7 μ F; C2 is the ordinary porcelain chip capacitor, and capacity is 1000PF; C3 is a ceramic disc capacitor, and capacity is 15PF; C4 is a ceramic disc capacitor, and capacity is 100PF.
CP is a variable capacitance, and range of capacity is 2～27PF.
MIC is a capacitor microphone, selects the electret capacitor microphone of two lead-out terminals for use, requires the shell connection circuit ground GND of capacitor microphone, so that reduce electromagnetic interference.
The making of circuit
When making the circuit of frequency modulation wireless microphone, require circuit board to use high-frequency loss circlet epoxy resins plate.
Oscillator coil L1 selects for use diameter 0.51mm enamelled wire to form around 5 circle tread flakings on diameter 4mm cylinder.
Transmitting antenna AT selects the telescopic antenna of 60cm for use, or uses 70～80cm maltha instead and drag line to make antenna, and the coverage of emission can be greater than 30m.
The adjustment of circuit
Make circuit with the frequency modulation wireless microphone of μ PC1651 production of integrated circuits, the electronic devices and components of selecting for use require performance intact, and the components and parts annexation in the accompanying drawing is welded to specifications, after circuit connecting wire and welding quality process scrutiny were errorless, circuit only need simply be debugged and get final product operate as normal.
At first, detect the complete machine quiescent current.1 pin of the power positive end of μ PC1651 is disconnected temporarily, " 50mA direct current retaining " with universal instrument, be serially connected in and measure the complete machine electric current in the μ PC1651 DC power supply loop, the complete machine static working current should be less than 23mA, otherwise should the scrutiny circuit be welded with inerrancy or the performance of μ PC1651 integrated circuit has problem.
Secondly, adjust the tranmitting frequency of oscillating circuit.Oscillator coil L1, variable capacitance CP resonant tank decision vibration tranmitting frequency change variable capacitance CP and just can change tranmitting frequency in the circuit.Carefully finely tune variable capacitance CP with noninductive bottle opener, also can change the spacing of oscillator coil L1 turn-to-turn, make tranmitting frequency cover 88～108MHZ scope, and the FM radio function is got final product at the stable signal that clearly receives wireless microphone in place, no broadcasting station.
Claims (4)
1. frequency modulation wireless microphone with μ PC1651 production of integrated circuits, be made up of DC power supply DC, audio signal pick-up circuit, high-frequency generator and radiating circuit, negative-feedback circuit and transmitting antenna AT, it is characterized in that: the model of integrated circuit (IC) 1 is μ PC1651 in high-frequency generator frequency modulation and the radiating circuit.
2. the frequency modulation wireless microphone with μ PC1651 production of integrated circuits according to claim 1, the feature of audio signal pick-up circuit is: the positive pole of the output termination electrochemical capacitor C1 of electret capacitor microphone MIC and an end of resistance R 1, the anodal VCC of another termination DC power supply DC of resistance R 1, the shell connection circuit ground GND of electret capacitor microphone MIC.
3. the frequency modulation wireless microphone with μ PC1651 production of integrated circuits according to claim 1, the feature of high-frequency generator and radiating circuit is: by integrated circuit (IC) 1, oscillator coil L1, variable capacitance CP, capacitor C 4 and transmitting antenna AT form, 2 pin of integrated circuit (IC) 1 connect the negative pole of electrochemical capacitor C1,4 pin of integrated circuit (IC) 1 connect the end of oscillator coil L1 and an end of capacitor C 4, antenna AT is penetrated in the other end sending and receiving of capacitor C 4, connection circuit ground GND behind the other end serial connection variable capacitance CP of oscillator coil L1,1 pin of integrated circuit (IC) 1 meets the anodal VCC of DC power supply DC, 3 pin connection circuit ground GND of integrated circuit (IC) 1.
4. the frequency modulation wireless microphone with μ PC1651 production of integrated circuits according to claim 1, the feature of negative-feedback circuit is: 4 pin that connect integrated circuit (IC) 1 after the 2 pin serial connection capacitor C 3 of integrated circuit (IC) 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200776457U CN202004963U (en) | 2011-03-23 | 2011-03-23 | Frequency modulation wireless microphone manufactured by muPC1651 integrated circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200776457U CN202004963U (en) | 2011-03-23 | 2011-03-23 | Frequency modulation wireless microphone manufactured by muPC1651 integrated circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202004963U true CN202004963U (en) | 2011-10-05 |
Family
ID=44707687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200776457U Expired - Fee Related CN202004963U (en) | 2011-03-23 | 2011-03-23 | Frequency modulation wireless microphone manufactured by muPC1651 integrated circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202004963U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196346A (en) * | 2011-03-23 | 2011-09-21 | 黄宇嵩 | Wireless frequency modulation microphone manufactured by muPC1651 integrated circuit |
| CN102427572A (en) * | 2011-11-25 | 2012-04-25 | 王寅寅 | High performance integrated circuit frequency modulation wireless microphone |
-
2011
- 2011-03-23 CN CN2011200776457U patent/CN202004963U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196346A (en) * | 2011-03-23 | 2011-09-21 | 黄宇嵩 | Wireless frequency modulation microphone manufactured by muPC1651 integrated circuit |
| CN102427572A (en) * | 2011-11-25 | 2012-04-25 | 王寅寅 | High performance integrated circuit frequency modulation wireless microphone |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9054773B2 (en) | Apparatus comprising a broadcast receiver circuit and provided with an antenna | |
| CN102355618A (en) | Modulated wave wireless microphone | |
| CN102158792A (en) | Frequency modulation radio microphone | |
| CN202004963U (en) | Frequency modulation wireless microphone manufactured by muPC1651 integrated circuit | |
| CN102196346A (en) | Wireless frequency modulation microphone manufactured by muPC1651 integrated circuit | |
| CN202334880U (en) | Frequency modulation wireless microphone with high-performance integrated circuit | |
| CN207753712U (en) | Electronic device with FM function | |
| CN102231633A (en) | Wireless frequency modulation transmitter manufactured by using varactor diode | |
| CN201477734U (en) | Micropower wireless remote control transmission circuit | |
| CN201910899U (en) | Frequency modulation wireless microphone | |
| CN202737853U (en) | FM transmitter with low power and high sensitivity | |
| CN205212801U (en) | Electrically tunable filter | |
| CN102427572A (en) | High performance integrated circuit frequency modulation wireless microphone | |
| CN102595291A (en) | Minitype frequency modulation wireless microphone | |
| CN202334835U (en) | Frequency modulation wireless microphone manufactured with integrated circuit | |
| CN202750078U (en) | FM transmitter with low power and high sensitivity | |
| CN203180902U (en) | A frequency modulation transmitter with strong anti-interference performance | |
| CN202143205U (en) | Amplitude-modulated wave wireless microphone | |
| CN202395945U (en) | Discrete component type wireless frequency-modulation microphone | |
| CN102158776A (en) | Frequency-modulation wireless microphone made of single battery | |
| CN204408615U (en) | Cable television system stereophonic signal emitter | |
| CN204392182U (en) | Non-transformer micropower frequency modulation transponder | |
| CN103532572A (en) | Low-power high-sensitivity FM transmitter | |
| CN203233413U (en) | A simple frequency modulation communication instrument | |
| CN204425628U (en) | FM transmitter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111005 Termination date: 20120323 |