CN104902386A - Frequency-modulated signal transmitter - Google Patents
Frequency-modulated signal transmitter Download PDFInfo
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- CN104902386A CN104902386A CN201510140607.4A CN201510140607A CN104902386A CN 104902386 A CN104902386 A CN 104902386A CN 201510140607 A CN201510140607 A CN 201510140607A CN 104902386 A CN104902386 A CN 104902386A
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Abstract
The invention provides a frequency-modulated signal transmitter, wherein the frequency-modulated signal transmitter comprises a 5V direct current power supply and filtering circuit, an audio signal input and attenuator circuit, a frequency transmission selection and signal input circuit and a radio-frequency signal transmitting circuit. In comparison with the transmitting circuit made by a BA1404 chip usually, the frequency modulation transmission integrated circuit (MAX2606) used by the circuit of the invention is simpler for making and lower in production cost. Because a variable capacitance diode is arranged in the MAX2606, the tone quality is better and the transmitting frequency is stable when using the MAX2606 as frequency modulation transmission in comparison with 2SC9018 transistor.
Description
Technical field
The invention belongs to radio frequency technical field, particularly a kind of FM transmitter.
Background technology
MP3 market possessing FM emission function pays close attention to by consumer very much, and this function uses not only novelty but also practical, and circuit design is got up and uncomplicated in fact.FM signal transponder of the present invention have simple for production, tonequality is excellent.FM signal transponder also has other purposes, such as: obtain audio signal from the equipment such as PC, television set, CD, DVD, launch after FM transmitter modulation, the broadcast receiver of FM function can be used to receive, realize FM transmission and the reception of audio signal like a cork.
The FM transmission integrated circuit (MAX2606) that circuit of the present invention uses, than usually adopting BA1404 chip manufacturing radiating circuit, has that making is more simple, cost of manufacture is cheaper.Due to the built-in variable capacitance diode of MAX2606, make FM transmission more than the transistor fabrication by types such as 2SC9018 with it, its tonequality is well a lot, and tranmitting frequency is stablized.
Below describe in detail FM transmitter of the present invention necessity involved in implementation process, guardian technique content.
Summary of the invention
Goal of the invention and beneficial effect: the FM transmission integrated circuit (MAX2606) that circuit of the present invention uses, than usually adopting BA1404 chip manufacturing radiating circuit, has that making is more simple, cost of manufacture is cheaper.Due to the built-in variable capacitance diode of MAX2606, make FM transmission more than the transistor fabrication by types such as 2SC9018 with it, its tonequality is well a lot, and tranmitting frequency is stablized.
Circuit working principle: FM transmitter core parts use FM transmission integrated circuit (MAX2606) this integrated circuit to have the advantages such as wide frequency range (45 ~ 650MHz), low noise, low-power consumption, its inside is integrated with a variable capacitance diode and voltage controlled oscillator, average oscillation frequency is arranged by oscillator coil L1, the average frequency of reflector is preset in 100MHz, and linear adjustment potentiometer RP1 then can select 100MHz as tranmitting frequency in the FM wave band of 88-108MHz.
Audio signal decays after coupling through index potentiometer RP2, send into internal oscillator circuit by the 1st pin of FM transmission integrated circuit (IC) 1, the radiofrequency signal after ovennodulation exports from the 6th pin of FM transmission integrated circuit (IC) 1 and delivers to transmitting antenna ANT through coupling capacitance C3.Because the audio frequency signal amplitude of MAX2606 input easily produces distortion higher than during 60mV, therefore use index potentiometer RP2 that audio signal is decayed to below 60mV.
Technical scheme: FM transmitter, it comprises 5V DC power supply and filter circuit, audio signal input and attenuator circuit, tranmitting frequency selection and signal input circuit, emission of radio frequency signals circuit, it is characterized in that:
Audio signal input and attenuator circuit: it is made up of audio signal socket IN, index potentiometer RP2, electric capacity C1, audio signal socket IN connects one end of index potentiometer RP2, one end of the activity termination capacitor C1 of index potentiometer RP2, the other end of electric capacity C1 connects the movable end of linear potentiometer RP1, the shell end of audio signal socket IN and the other end connection circuit ground GND of index potentiometer RP2;
Tranmitting frequency is selected and signal input circuit: it is made up of linear potentiometer RP1, resistance R1 and electric capacity C2, the one termination circuit positive pole VCC of linear potentiometer RP1, one end of the movable end connecting resistance R1 of linear potentiometer RP1, one end of another termination capacitor C2 of resistance R1 and the 3rd pin of FM transmission integrated circuit (IC) 1, the other end connection circuit ground GND of electric capacity C2;
Emission of radio frequency signals circuit: it is by FM transmission integrated circuit (IC) 1, oscillator coil L1, resistance R2, resistance R3, coupling capacitance C3 and transmitting antenna ANT forms, the model that FM transmission integrated circuit (IC) 1 is selected is MAX2606, 1st pin of FM transmission integrated circuit (IC) 1 connects one end of oscillator coil L1, 2nd pin of FM transmission integrated circuit (IC) 1 and the other end connection circuit ground GND of oscillator coil L1, one end of the 5th pin connecting resistance R2 of FM transmission integrated circuit (IC) 1 and one end of resistance R3, the other end of the 6th pin connecting resistance R2 of FM transmission integrated circuit (IC) 1, the other end of the 4th pin connecting resistance R3 of FM transmission integrated circuit (IC) 1, 6th pin of FM transmission integrated circuit (IC) 1 connects one end of coupling capacitance C3, the other end of coupling capacitance C3 meets transmitting antenna ANT,
5V DC power supply and filter circuit thereof: the positive pole of 5V DC power supply connects the positive pole of electrochemical capacitor C4 with one end of electric capacity C5 and is connected with circuit anode VCC, the negative pole of 5V DC power supply connects the negative pole of electrochemical capacitor C4 with the other end of electric capacity C5 and to be connected with circuit ground GND.
Accompanying drawing explanation
Accompanying drawing 1 is the embodiment circuit working schematic diagram that the invention provides a FM transmitter.
Embodiment
According to the FM transmitter circuit working schematic diagram shown in accompanying drawing 1 and accompanying drawing explanation, and according to annexation between components and parts in each several part circuit described in summary of the invention, and components and parts technical parameter described in execution mode requires and circuit production main points are carried out enforcement and can be realized the present invention, is further described correlation technique of the present invention below in conjunction with embodiment.
The technical parameter of components and parts and selection requirement
IC1 is FM transmission integrated circuit, and the model selected is MAX2606;
L1 is oscillator coil, and average oscillation frequency is set in 100MHz, and its inductance value is about 390nH;
RP1 is linear potentiometer, and resistance is 110K Ω; RP2 is exponential potentiometer, and resistance is 12K Ω;
Resistance all selects 1/8W metalfilmresistor, and the resistance of resistance R1 is 270 Ω, and the resistance of resistance R2 is 1.2K Ω, and the resistance of resistance R3 is 1.2K Ω;
Electric capacity C1 ~ C4 all selects Leaded Ceramic Disc Capacitor, and the capacity of the capacity of electric capacity C1 to be the capacity of 0.68 μ F, electric capacity C2 be 2200PF, coupling capacitance C3 is 1000PF, and the capacity of electric capacity C4 is the capacity of 10 μ F/16V, electric capacity C5 is 0.01 μ F;
ANT is transmitting antenna, uses the telescopic antenna that length is 80cm;
DC is DC power supply, and its voltage is 5V, requires 5V DC power supply maximum output current >=100mA.
Circuit production main points and circuit debugging
1. because circuit working of the present invention is at high band, when design and fabrication printed circuit board, the configuration of components and parts and wire length will meet high-frequency design requirement, be welded to connect line as far as possible short, be advisable to be close to copper foil plate, FM transmission integrated circuit (IC) 1 and other elements can directly be welded on copper-clad surface;
2. to mix up controlling the oscillator coil L1 of tranmitting frequency, requiring that its inductance value is in the parameter area of regulation, linear adjustment potentiometer RP1 at the FM waveband selection 100MHz of 88 ~ 108MHz as tranmitting frequency;
3. preferably adopt the 5V DC power supply of voltage stabilization to power, to reduce frequency drift and noise;
4. all pulled out by the telescopic antenna of 0.8 of FM transmitter meter, frequency-modulated wave answers covering radius to reach 80 meters, and requires acoustical sound.
Circuit components layout of the present invention, circuit structure design, its shape and size etc. of outward appearance are not all key technologies of the present invention; neither application claims protection technology contents; because not affecting specific implementation process of the present invention, therefore do not illustrate one by one in the description.
Claims (1)
1. a FM transmitter, it comprises 5V DC power supply and filter circuit, audio signal input and attenuator circuit, tranmitting frequency selection and signal input circuit, emission of radio frequency signals circuit, it is characterized in that:
Described audio signal input and attenuator circuit are made up of audio signal socket IN, index potentiometer RP2, electric capacity C1, audio signal socket IN connects one end of index potentiometer RP2, one end of the activity termination capacitor C1 of index potentiometer RP2, the other end of electric capacity C1 connects the movable end of linear potentiometer RP1, the shell end of audio signal socket IN and the other end connection circuit ground GND of index potentiometer RP2;
Described tranmitting frequency is selected and signal input circuit is made up of linear potentiometer RP1, resistance R1 and electric capacity C2, the one termination circuit positive pole VCC of linear potentiometer RP1, one end of the movable end connecting resistance R1 of linear potentiometer RP1, one end of another termination capacitor C2 of resistance R1 and the 3rd pin of FM transmission integrated circuit (IC) 1, the other end connection circuit ground GND of electric capacity C2;
Described emission of radio frequency signals circuit is by FM transmission integrated circuit (IC) 1, oscillator coil L1, resistance R2, resistance R3, coupling capacitance C3 and transmitting antenna ANT forms, the model that FM transmission integrated circuit (IC) 1 is selected is MAX2606, 1st pin of FM transmission integrated circuit (IC) 1 connects one end of oscillator coil L1, 2nd pin of FM transmission integrated circuit (IC) 1 and the other end connection circuit ground GND of oscillator coil L1, one end of the 5th pin connecting resistance R2 of FM transmission integrated circuit (IC) 1 and one end of resistance R3, the other end of the 6th pin connecting resistance R2 of FM transmission integrated circuit (IC) 1, the other end of the 4th pin connecting resistance R3 of FM transmission integrated circuit (IC) 1, 6th pin of FM transmission integrated circuit (IC) 1 connects one end of coupling capacitance C3, the other end of coupling capacitance C3 meets transmitting antenna ANT,
In described 5V DC power supply and filter circuit thereof, the positive pole of 5V DC power supply connects the positive pole of electrochemical capacitor C4 with one end of electric capacity C5 and is connected with circuit anode VCC, and the negative pole of 5V DC power supply connects the negative pole of electrochemical capacitor C4 with the other end of electric capacity C5 and to be connected with circuit ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510140607.4A CN104902386A (en) | 2015-03-28 | 2015-03-28 | Frequency-modulated signal transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510140607.4A CN104902386A (en) | 2015-03-28 | 2015-03-28 | Frequency-modulated signal transmitter |
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| Publication Number | Publication Date |
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| CN104902386A true CN104902386A (en) | 2015-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510140607.4A Pending CN104902386A (en) | 2015-03-28 | 2015-03-28 | Frequency-modulated signal transmitter |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102123338A (en) * | 2011-03-23 | 2011-07-13 | 黄宇嵩 | Frequency modulation wireless microphone manufactured by nand gate |
| CN102196346A (en) * | 2011-03-23 | 2011-09-21 | 黄宇嵩 | Wireless frequency modulation microphone manufactured by muPC1651 integrated circuit |
| CN204425628U (en) * | 2015-03-28 | 2015-06-24 | 王志 | FM transmitter |
-
2015
- 2015-03-28 CN CN201510140607.4A patent/CN104902386A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102123338A (en) * | 2011-03-23 | 2011-07-13 | 黄宇嵩 | Frequency modulation wireless microphone manufactured by nand gate |
| CN102196346A (en) * | 2011-03-23 | 2011-09-21 | 黄宇嵩 | Wireless frequency modulation microphone manufactured by muPC1651 integrated circuit |
| CN204425628U (en) * | 2015-03-28 | 2015-06-24 | 王志 | FM transmitter |
Non-Patent Citations (2)
| Title |
|---|
| 守望者的的: "《百度文库 https://wenku.baidu.com/view/f42eb46825c52cc58bd6be51.html?re=view》", 7 December 2010 * |
| 禾木: ""新型调频发射芯片MAX2606"", 《电子报 电子产品与器件版》 * |
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Application publication date: 20150909 |
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