CN205249187U - Low -cost FM frequency modulation transmitter circuit - Google Patents
Low -cost FM frequency modulation transmitter circuit Download PDFInfo
- Publication number
- CN205249187U CN205249187U CN201520980533.0U CN201520980533U CN205249187U CN 205249187 U CN205249187 U CN 205249187U CN 201520980533 U CN201520980533 U CN 201520980533U CN 205249187 U CN205249187 U CN 205249187U
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- resistance
- capacitor
- triode
- frequency modulation
- electric capacity
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- Expired - Fee Related
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Abstract
The utility model discloses a low -cost FM frequency modulation transmitter circuit, including resistance R9, adapter B, triode V1, inductance L1, electric capacity C6 and battery E, battery E's anodal connecting resistance R1, resistance R5, inductance L1, electric capacity C3 and electric capacity C4, resistance R5's other end connecting resistance R6 and resistance R9, electric capacity C6 and adapter B are connected to resistance R9's the other end, and electric capacity C1, electric capacity C3's the other end, resistance R2, resistance R3, battery E's negative pole and triode V1's projecting pole are connected to adapter B's the other end. The utility model discloses low -cost FM frequency modulation transmitter circuit simple structure, components and parts are few, have abandoned complicated chip control structure, only use essential electronic component to constitute the frequency modulation transmitting circuit, have increased the interference immunity of circuit, consequently have with low costs, stable performance and convenient to use's advantage.
Description
Technical field
The utility model relates to a kind of frequency modulation transmitter, specifically a kind of low cost FM frequency modulation transmitter circuit.
Background technology
Frequency modulation transmitter is the abbreviation of frequency-modulated broadcast transmitter, is mainly used in the voice of f-m broadcast station and music program to launch with wireless mode any one f-m broadcast station, no matter its scale (state radio, provincial radio station, city-level radio station, radio station at county level, township level radio station, at village level radio station, radio station, campus, enterprises and institutions radio station, army's barracks radio station, etc.), all will be formed by frequency/audio-frequency broadcasting control equipment, transmission equipment, frequency modulation transmitter and transmitting antenna feeder. The radio station that coverage is large, needs the transmitting antenna of frequency modulation transmitter that transmitting power is large, high-gain and is erected at overhead high place; And the little radio station of coverage needs frequency modulation transmitter that transmitting power is little, suitable antenna being erected on suitable height gains. The most complex structure of existing frequency modulation transmitter, cost of manufacture is high, is unfavorable for miniaturization production and cost control.
Utility model content
The purpose of this utility model is to provide a kind of low cost FM frequency modulation transmitter circuit, to solve the problem proposing in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of low cost FM frequency modulation transmitter circuit, comprises resistance R 9, sound pick-up B, triode V1, inductance L 1, capacitor C 6 and battery E, the anodal contact resistance R1 of described battery E, resistance R 5, inductance L 1, capacitor C 3 and capacitor C 4, the other end contact resistance R6 of resistance R 5 and resistance R 9, the other end of resistance R 9 connects capacitor C 6 and sound pick-up B, and the other end of sound pick-up B connects capacitor C 1, the other end of capacitor C 3, resistance R 2, resistance R 3, the emitter stage of the negative pole of battery E and triode V1, the other end contact resistance R7 of capacitor C 6 and the base stage of triode V1, the other end of the colelctor electrode contact resistance R6 of triode V1, the other end of resistance R 7 and capacitor C 5, the other end contact resistance R4 of capacitor C 5, the other end of the other end contact resistance R1 of resistance R 4, the base stage of the other end of the other end of resistance R 2 and capacitor C 1 and triode V2, the colelctor electrode of triode V2 connects another point of capacitor C 4, capacitor C 2, the other end of inductance L 1 and antenna A, the other end of emitter stage contact resistance R3 of triode V2 and the other end of capacitor C 2.
Compared with prior art, the beneficial effects of the utility model are: the utility model low cost FM frequency modulation transmitter circuit structure is simple, components and parts are few, abandon complicated chip controls structure, only use basic electronic component composition modulating emission circuit, increase the anti-interference of circuit, therefore had advantages of that cost is low, stable performance and easy to use.
Brief description of the drawings
Fig. 1 is the circuit diagram of low cost FM frequency modulation transmitter circuit.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment. Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, a kind of low cost FM frequency modulation transmitter circuit, comprises resistance R 9, sound pick-up B, triode V1, inductance L 1, capacitor C 6 and battery E, the anodal contact resistance R1 of described battery E, resistance R 5, inductance L 1, capacitor C 3 and capacitor C 4, the other end contact resistance R6 of resistance R 5 and resistance R 9, the other end of resistance R 9 connects capacitor C 6 and sound pick-up B, and the other end of sound pick-up B connects capacitor C 1, the other end of capacitor C 3, resistance R 2, resistance R 3, the emitter stage of the negative pole of battery E and triode V1, the other end contact resistance R7 of capacitor C 6 and the base stage of triode V1, the other end of the colelctor electrode contact resistance R6 of triode V1, the other end of resistance R 7 and capacitor C 5, the other end contact resistance R4 of capacitor C 5, the other end of the other end contact resistance R1 of resistance R 4, the base stage of the other end of the other end of resistance R 2 and capacitor C 1 and triode V2, the colelctor electrode of triode V2 connects another point of capacitor C 4, capacitor C 2, the other end of inductance L 1 and antenna A, the other end of emitter stage contact resistance R3 of triode V2 and the other end of capacitor C 2.
Operation principle of the present utility model is: triode V2 forms a more stable RF oscillator, and its frequency is determined by inductance L 1 and tuning capacitance C4. Determine by C4 is set the operating frequency of expecting, at the FM of standard broadcast band, tuning circuit is designed to the frequency of the highest generation 110MHz. Capacitor C 2 provides necessary feedback voltage by the resistance R 3 in V2 emitter circuit, to maintain oscillating condition. Resistance R 1 and R2 provide correct work needed emitter junction bias voltage, and capacitor C 1 switches to ground by all radiofrequency signals that are added to base stage. Capacitor C 3 provides radio frequency path for the accumulator that L1 and C4 form, and blocking-up is simultaneously added to the supply voltage of the colelctor electrode of V2.
Audio-frequency unit a high sensitivity capacitive sound pick-up and built-in fet V1 composition, and by the low level sound clearly picking up within the scope of voice spectrum. The voice voltage that B produces on R9 is coupled to the base stage of audio-frequency amplifier triode V1 through capacitor C 6. The Dc bias of generator triode V2 is provided by resistance R 1 and R2. A signal voltage of the upper generation of R6 is coupled to the base stage of V2 through resistance R 4 by polarity free capacitor C5. Finally launch by oscillator and antenna A, the gain of V1 is by the ratio control of R7 and R6. Dc point is set to and allows the maximum changing range of colelctor electrode be the signal after amplifying. Now, the voice signal through amplifying, by the dc point of a small amount of mobile base stage part, carries out FM and AM modulation to oscillating circuit. Resistance R 5, to oscillator and voicefrequency circuit uncoupling, prevents feedback and other undesired effects.
Claims (1)
1. a low cost FM frequency modulation transmitter circuit, comprises resistance R 9, sound pick-up B, triode V1, inductance L 1, capacitor C 6 and battery E, is characterized in that, the anodal contact resistance R1 of described battery E, resistance R 5, inductance L 1, capacitor C 3 and capacitor C 4, the other end contact resistance R6 of resistance R 5 and resistance R 9, the other end of resistance R 9 connects capacitor C 6 and sound pick-up B, and the other end of sound pick-up B connects capacitor C 1, the other end of capacitor C 3, resistance R 2, resistance R 3, the emitter stage of the negative pole of battery E and triode V1, the other end contact resistance R7 of capacitor C 6 and the base stage of triode V1, the other end of the colelctor electrode contact resistance R6 of triode V1, the other end of resistance R 7 and capacitor C 5, the other end contact resistance R4 of capacitor C 5, the other end of the other end contact resistance R1 of resistance R 4, the base stage of the other end of the other end of resistance R 2 and capacitor C 1 and triode V2, the colelctor electrode of triode V2 connects another point of capacitor C 4, capacitor C 2, the other end of inductance L 1 and antenna A, the other end of emitter stage contact resistance R3 of triode V2 and the other end of capacitor C 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520980533.0U CN205249187U (en) | 2015-12-02 | 2015-12-02 | Low -cost FM frequency modulation transmitter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520980533.0U CN205249187U (en) | 2015-12-02 | 2015-12-02 | Low -cost FM frequency modulation transmitter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205249187U true CN205249187U (en) | 2016-05-18 |
Family
ID=55948255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520980533.0U Expired - Fee Related CN205249187U (en) | 2015-12-02 | 2015-12-02 | Low -cost FM frequency modulation transmitter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205249187U (en) |
-
2015
- 2015-12-02 CN CN201520980533.0U patent/CN205249187U/en not_active Expired - Fee Related
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160518 Termination date: 20161202 |