CN204425628U - FM transmitter - Google Patents
FM transmitter Download PDFInfo
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- CN204425628U CN204425628U CN201520180832.6U CN201520180832U CN204425628U CN 204425628 U CN204425628 U CN 204425628U CN 201520180832 U CN201520180832 U CN 201520180832U CN 204425628 U CN204425628 U CN 204425628U
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Abstract
The utility model provides a kind of FM transmitter, and its feature 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.The FM transmission integrated circuit (MAX2606) that the utility model circuit uses, than the radiating circuit usually adopting BA1404 chip manufacturing, 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.
Description
Technical field
The utility model 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 described in the utility model 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 the utility model circuit 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 described in the utility model necessity involved in implementation process, guardian technique content.
Utility model content
Goal of the invention and beneficial effect: the FM transmission integrated circuit (MAX2606) that the utility model circuit 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 utility model 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 utility model content, 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 utility model, is further described correlation technique of the present utility model 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 utility model 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 utility model, circuit structure design, its shape and size etc. of outward appearance are not all key technologies of the present utility model; neither the claimed technology contents of the utility model; because not affecting the utility model specific implementation process, 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 |
|---|---|---|---|
| CN201520180832.6U CN204425628U (en) | 2015-03-28 | 2015-03-28 | FM transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520180832.6U CN204425628U (en) | 2015-03-28 | 2015-03-28 | FM transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204425628U true CN204425628U (en) | 2015-06-24 |
Family
ID=53475953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520180832.6U Expired - Fee Related CN204425628U (en) | 2015-03-28 | 2015-03-28 | FM transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204425628U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104902386A (en) * | 2015-03-28 | 2015-09-09 | 王志 | Frequency-modulated signal transmitter |
-
2015
- 2015-03-28 CN CN201520180832.6U patent/CN204425628U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104902386A (en) * | 2015-03-28 | 2015-09-09 | 王志 | Frequency-modulated signal transmitter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150624 Termination date: 20160328 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |