CN2211674Y - Frequency modulating power amplifier - Google Patents
Frequency modulating power amplifier Download PDFInfo
- Publication number
- CN2211674Y CN2211674Y CN 94224611 CN94224611U CN2211674Y CN 2211674 Y CN2211674 Y CN 2211674Y CN 94224611 CN94224611 CN 94224611 CN 94224611 U CN94224611 U CN 94224611U CN 2211674 Y CN2211674 Y CN 2211674Y
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Abstract
The utility model discloses a frequency modulating transmission sound amplifier. The utility model integrates sound amplification and FM transmission. Sound frequency signals are conducted to frequency modulation. After the frequency selection of three-stage high Q values is amplified, after the power of the three-stage high Q values are amplified, after the harmonic is filtered, the three-stage high Q values transmit towards the air through a transmission antenna. The utility model overcomes the disadvantage that the existing sound amplifier has the single function of the sound amplification only. Not only the utility model can be used as the common sound amplifier, but also the utility model can be used for the signal transmission for a long distance. The utility model has the advantages of small volume, high transmission efficiency, wide transmission range, low investment, and convenient maintenance. The utility model is suitable for using for fixed places and flowing occasions.
Description
The utility model relates to a kind of public address system, especially relates to a kind of frequency modulation emission sound amplifier.
Common sound amplifier all adopts machine inside trumpet or external Wireline to amplify, and does not have the frequency modulation emissivities, and propagation distance is short like this, radiation scope is narrow, want transmission range a little further, must pole erecting, install electricity lines, invest bigger, safeguard also inconvenience, efficiency of transmission is also low.
The purpose of this utility model be to provide a kind of integrate amplify launch with frequency modulation, spread scope is wide, efficiency of transmission is high frequency modulation emission sound amplifier.
The purpose of this utility model is achieved in that the utility model comprises the audio signal pick-up circuit, pre-amplification circuit, the line signal input circuit, diverter switch, signal amplification circuit, frequency deviation and power indicating circuit, inside and outside monitoring circuit, audio signal of drawing from the middle end points of diverter switch or line signal are through falling Q resistance, preemphasis circuit, coupling and capacitive transmission are to the audio input end of frequency modulation emission integrated circuit, by frequency modulation emission integrated circuit letter frequency signal or line signal are carried out the frequency modulation modulation, FM signal through ovennodulation is carried out frequency-selecting and amplification by three high Q value selective frequency amplifier circuits, carry out power amplification by penetrating again with transferring to the two-stage high-frequency amplifier circuit after impedance conversion and the high frequency amplification, through the harmonic filter circuit filtering harmonic wave that the signal after the power amplification is formed by several electric capacity and inductance, FM signal by transmitting antenna to aerial emission.
Transmitting antenna is that a kind of the string between aerial plug and antenna emission contact jaw has the loading telescopic antenna of an inductance.
The utility model integrates and amplifies and frequency modulation is launched, and with common FM receiver or be with other loom of FM reception function to listen to, constitutes a wireless receiving and dispatching public address system.The utility model has overcome the shortcoming that existing sound amplifier only has the simple function that amplifies, it can use as common sound amplifier, can be used for remote signal again propagates, have that volume is little, reduced investment, easy to maintenance, the advantage that efficiency of transmission is high is very suitable for the use of many fixed-sites such as industrial and mineral, school, organ or rural broadcasting station and mobile occasion.
Below in conjunction with embodiment and contrast accompanying drawing the utility model is described in further detail.
Fig. 1 is a frame principle figure of the present utility model.
Fig. 2 is a fm modulation circuit schematic diagram of the present utility model
Fig. 3 is the circuit theory diagrams of radio frequency power amplifier of the present utility model and harmonic filtration.
Fig. 4 is the structural representation of loading telescopic antenna of the present utility model.
Audio signal is passed through the audio signal pick-up circuit (as microphone, tape phonograph) converts the corresponding signal of telecommunication to, carrying out signal by the two pre-amplification circuits of low noise again amplifies, add to first end points of diverter switch (diverter switch is a single-pole double-throw switch (SPDT)), external line signal via line signal input circuit adds to the 3rd end points of diverter switch, audio signal or line signal are through the middle end points output of diverter switch, one the road delivers to the further amplification signal of signal amplification circuit, deliver to inside and outside monitoring circuit, promote sound horn or lug machine and listen to, this part is general sound amplifier circuit.Another road transfers to fm modulation circuit, and the signal of telecommunication is carried out frequency modulation, carries out power amplification through the FM signal of ovennodulation by high-frequency amplifier circuit, and then through behind the harmonic filtering circuit filtering harmonic wave, FM signal by transmitting antenna to aerial emission.
A road remove modulation FM signal behind the harmonic wave after filtration and add to frequency deviation and power indicating circuit after synthetic from what harmonic filtering circuit was drawn, drive the size that gauge outfit shows modulation degree or power with another road audio signal of coming from signal amplification circuit.
Stable+the 24V of power circuit output and+voltage of 6V, for the each several part circuit provides voltage.
From switching open and the middle end points audio signal of drawing or line signal through falling Q resistance R L, the preemphasis circuit that resistance R 1 and capacitor C 1 compose in parallel, coupling capacitance C2 transfers to audio input end 5 pin of frequency modulation emission integrated circuit (IC) 1, inductance L 1 and crystal oscillator ZT are serially connected between variable reactance output 1 pin and strength input 16 pin, capacitor C 4 is attempted by between two strength input 15 pin and 16 pin, capacitor C 5 is attempted by between strength input 15 pin and the ground, constitute a reference-frequency oscillator, resistance R 2 is attempted by between audio input end 5 pin and audio output 6 pin, capacitor C 3 is attempted by between audio output 6 pin and modulation input 3 pin, capacitor C 6 connects decoupling end 2 pin, FM signal through ovennodulation is exported from buffer output end 14 pin, be coupled to the base stage of triode T1 through coupling capacitance C7, again via triode T1, T2, the three grades high Q value selective frequency amplifier circuits that T3 forms carry out frequency-selecting and amplification to FM signal, penetrating through triode T4 again with impedance conversion, frequency-modulated signal transmission after the high frequency of triode T5 amplifies is to the base stage of triode T6, via triode T6, the big circuit of two-stage radio frequency power amplifier that T7 forms carries out power amplification, via inductance L 2～L5, FM signal behind the harmonic filtering circuit filtering harmonic wave that capacitor C 8～C15 forms through coupling capacitance C16 by transmitting antenna to aerial emission.
Capacitor C 17, C18, C19, diode D, resistance R 3, R4 form the power monitoring circuit, from drawing the size of armed FM signal to frequency deviation and power indicating circuit driving gauge outfit indicated horsepower between capacitor C 16 and the transmitting antenna.
Harmonic filtering circuit is by inductance L 2～L5, capacitor C 8～C15 forms, the collector electrode of a termination triode T7 of inductance L 2 wherein, the other end and capacitor C 9, inductance L 3, the parallel branch that inductance L 4 and capacitor C 12 are formed, the parallel branch that inductance L 5 and capacitor C 14 are formed, capacitor C 16 is connected successively, variable capacitance C8 is attempted by between the public point and ground of inductance L 2 and capacitor C 9, capacitor C 10 is attempted by between the public point and ground of capacitor C 9 and inductance L 3, capacitor C 11 is attempted by inductance L 3 and inductance L 4, between the public point and ground of the parallel branch of forming between the capacitor C 12, capacitor C 13 is attempted by inductance L 4, parallel branch and inductance L 5 that capacitor C 12 is formed, between the public point and ground of the parallel branch that capacitor C 14 is formed, variable capacitance C15 is attempted by inductance L 5, between the parallel branch that capacitor C 14 is formed and the public point and ground of capacitor C 16.
Power circuit provides+voltage of the 24V voltage by output+15V behind the integrated package of pressure-stabilizing IC2, and for fm modulation circuit provides voltage.
Transmitting antenna 3 is selected from a kind of in common cross antenna or the telescopic antenna, wherein telescopic antenna be a kind of by one 50 Ω aerial plug 1 and antenna emission contact jaw (2) between string the loading telescopic antenna of an inductance L 6 is arranged.
Wherein:
IC1 is small-power frequency modulation emission integrated circuit MC2831A, and IC2 is an integrated package of pressure-stabilizing 7815, triode T1, T4, T5; 2N5770, T2, T3:2SK168A, T6:3DA32B, T7:3DA22B falls Q resistance and is composed in parallel by the resistance of a coil and a 1.5K, plays the effect of filtering high frequency.
Claims (3)
1, a kind of frequency modulation emission sound amplifier, comprise: the audio signal pick-up circuit, pre-amplification circuit, the line signal input circuit, diverter switch, signal amplification circuit, inside and outside monitoring circuit, frequency deviation and power indicating circuit, it is characterized in that: from the audio signal of the middle end points output of described diverter switch or line signal through falling Q resistance (RL), the preemphasis circuit that resistance (R1) and electric capacity (C1) compose in parallel, coupling capacitance (C2) is transferred to audio input end (5) pin of frequency modulation emission integrated circuit (IC1), inductance (L1) and crystal oscillator (ZT) are serially connected between variable reactance output (1) pin and strength input (16) pin, electric capacity (C4) is attempted by between two strength input (15) pin and (16) pin, electric capacity (C5) is attempted by between strength input (15) pin and the ground, resistance (R2) is attempted by between audio input end (5) pin and audio output (6) pin, electric capacity (C3) is attempted by between audio output (6) pin and modulation input (3) pin, electric capacity (C6) connects decoupling end (6) pin, FM signal through ovennodulation is exported from buffer output end (14) pin, be coupled to the base stage of triode (T1) through coupling capacitance (C7), again via triode (T1, T2, T3) the three grades high Q value selective frequency amplifier circuits of Zu Chenging carry out frequency-selecting and amplification to FM signal, penetrating through triode (T4) again with impedance conversion, frequency-modulated signal transmission after the high frequency of triode (T5) amplifies is to the base stage of triode (T6), via triode (T6, T7) the two-stage high-frequency amplifier circuit of Zu Chenging carries out power amplification, via inductance (L2～L5), electric capacity (FM signal after the harmonic filtering circuit of C8～C15) form by coupling capacitance (C16) to transmitting antenna 3.
2, frequency modulation emission sound amplifier as claimed in claim 1, it is characterized in that: the collector electrode of the triode from described high-frequency amplifier circuit (T7) connects an end of the inductance (L2) in the harmonic filtering circuit, the other end of inductance (L2) and electric capacity (C9), inductance (L3), the parallel branch that inductance (L4) and electric capacity (C12) are formed, the parallel branch that inductance (L5) and electric capacity (C14) are formed, electric capacity (C16) is connected successively, variable capacitance (C8) is attempted by between the public point and ground of inductance (L2) and electric capacity (C9), electric capacity (C10) is attempted by between the public point and ground of electric capacity (C9) and inductance (L3), electric capacity (C11) is attempted by inductance (L3) and inductance (L4), between the public point and ground of the parallel branch that electric capacity (C12) is formed, electric capacity (C13) is attempted by inductance (L4), parallel branch and inductance (L5) that electric capacity (C12) is formed, between the public point and ground of the parallel branch that electric capacity (C14) is formed, variable capacitance (C15) is attempted by inductance (L5), between the parallel branch that electric capacity (C14) is formed and the public point and ground of electric capacity (C16).
3, frequency modulation emission sound amplifier as claimed in claim 1, it is characterized in that: described transmitting antenna 3 is loading telescopic antenna that string has an inductance (L6) between a kind of aerial plug at 50 Ω (1) and the antenna emission contact jaw (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94224611 CN2211674Y (en) | 1994-07-26 | 1994-07-26 | Frequency modulating power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94224611 CN2211674Y (en) | 1994-07-26 | 1994-07-26 | Frequency modulating power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2211674Y true CN2211674Y (en) | 1995-11-01 |
Family
ID=33837979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94224611 Expired - Fee Related CN2211674Y (en) | 1994-07-26 | 1994-07-26 | Frequency modulating power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2211674Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888825B (en) * | 2005-06-29 | 2010-12-08 | 英华达(上海)电子有限公司 | Electronic navigator for transmitting speech information to vehicle audio |
| CN103334793A (en) * | 2013-07-12 | 2013-10-02 | 河北联合大学 | Underground audio broadcasting alarming device |
-
1994
- 1994-07-26 CN CN 94224611 patent/CN2211674Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888825B (en) * | 2005-06-29 | 2010-12-08 | 英华达(上海)电子有限公司 | Electronic navigator for transmitting speech information to vehicle audio |
| CN103334793A (en) * | 2013-07-12 | 2013-10-02 | 河北联合大学 | Underground audio broadcasting alarming device |
| CN103334793B (en) * | 2013-07-12 | 2015-06-10 | 河北联合大学 | Underground audio broadcasting alarming device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |