CN104786926A - High-loudness vehicle-mounted alarm - Google Patents
High-loudness vehicle-mounted alarm Download PDFInfo
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Abstract
The invention discloses a high-loudness vehicle-mounted alarm. The high-loudness vehicle-mounted alarm consists of an alarm machine box and a high-power speaker, wherein the high-power speaker is formed to a compressive sounding head by a W-shaped basin frame, an annular magnetic conducting cavity, an annular strong permanent magnet, a W-shaped sound film, a skeleton sound ring and a W-shaped end cover; a reflective horn is mounted on the compressive sounding head; the W-shaped sound film is equivalent to one sound ring to push two sound films, so that the effective vibrating area of the sound film is enlarged; a conical structure of the W-shaped sound film is excellent in rigidity and light in weight; the sound ring of a center tap is directly matched and connected with an audio power amplifier output circuit; an improved magnetic circuit system is simple in structure, strong in magnetism and light in weight; in the audio power amplifier circuit, upper and lower field effect tubes are connected to A and B type push-pull output circuits having common drain; the negative feedback is deep; the amplifier tone quality is improved; the amplifier stability is improved; the field effect tubes are high in output current and low in loss; a vehicle power supply with low voltage of 12 V is only used for generating an electroacoustic power above 500 W; and the high-power speaker is driven to give a high-loudness alarm sound.
Description
Technical field
The present invention relates to a kind of siren horn, particularly relate to the vehicle-mounted siren horn of a kind of high loudness.
Background technology
At present worldwide, the situation of anti-terrorism is still severe, China is no exception, public security police is at the sudden and violent probably point period of the day from 11 p.m. to 1 a.m of strike, first to employ police car and rush towards scene, the alarm song that the vehicle-mounted siren horn that police car configures sends, certain fright effect is had to the arrogance of sudden and violent probably molecule, but existing vehicle-mounted siren horn horsepower output is generally at about 100W, oneself can not meet the needs of anti-terrorism situation, in new vehicle-mounted siren horn technology, also the up-to-date technology of some function aspects is just increased, the such as patent No. is " 201120396493.7 ", name is called the patent of " a kind of Multifunctional police alarm ".Therefore, research and develop a kind of vehicle-mounted siren horn device more powerful to sudden and violent probably molecule fright power, be only the important device that configuration is badly in need of in current public security police car institute.
Summary of the invention
In order to overcome the deficiency of existing vehicle-mounted siren horn and " a kind of Multifunctional police alarm " technology, the invention provides the vehicle-mounted siren horn of a kind of high loudness, it not only improves the power amplification circuit in existing alert machine, but also improve the structure of loud speaker, the present invention only utilizes the low potential source of automobile 12V, just can produce the electric acoustic power of more than 500W, drive supersound projector to send high loudness chimes of doom.
The vehicle-mounted siren horn of described high loudness solves the technical scheme that its technical matters adopts and is made up of siren horn machine box and supersound projector, its constructional feature is: described siren horn machine box front end is provided with guidance panel, guidance panel is provided with some alarm songs and selects and function selection key, signal generating circuit and audio power amplifier circuit is provided with in machine box, described supersound projector is by W type frame, ring-like magnetic conduction cavity, ring-like strong permanent magnet, W type sound film, skeleton voice coil loudspeaker voice coil and W type end cap composition compression sound producing head, compression sound producing head upper end is provided with connection screwed pipe, connect on screwed pipe and reflective horn is installed, described W type frame refers to that its section is W shape, with the overall stamping forming basin type support of iron sheet, male-tapered circle is arranged with outside W type frame, centre is provided with inner conical lid, lower end is provided with ring-like magnetic conduction cavity, ring-like magnetic conduction cavity inner wall is provided with ring-like strong permanent magnet, ring-like strong permanent magnet upper end and ring-like magnetic conduction cavity inner wall upper end same plane, high-intensity magnetic field air gap is formed between ring-like strong permanent magnet cylindrical and ring-like magnetic conduction chamber outer wall, ring-like magnetic conduction chamber outer wall upper end connects male-tapered circle lower end, ring-like magnetic conduction cavity inner wall upper end connects inner conical lid lower end, inner conical covers end and is provided with installation round platform, round platform is installed and is provided with centre hole and set screw nail, male-tapered circle upper end is provided with installing ring platform, installation round platform and installing ring platform are at same plane, the tapering of male-tapered circle is equal with the tapering of inner conical lid, described W type sound film refers to that its section is W shape, with the shaping basin type sound film of fiber reinforced resinous material overall processing, taper ring is arranged with outside W type sound film, centre is provided with conical lid, lower end is provided with ring-like mounting groove, bonding skeleton voice coil loudspeaker voice coil in ring-like mounting groove, skeleton voice coil loudspeaker voice coil lower end cylindrical coiling, conical lid upper end is provided with elastic wave sheet, taper ring upper end is provided with and plays ripple circle, elastic wave sheet and bullet ripple circle are at same plane, the tapering of taper ring is equal with the tapering of conical lid, W type sound film is arranged on W type frame upper end, skeleton voice coil loudspeaker voice coil is put in high-intensity magnetic field air gap, elastic wave sheet in the middle part of W type sound film is shaped with center positioning hole, the bullet ripple circle circumference of W type sound film circumference is mounting edge, mounting edge is adhesive on installing ring platform, mounting edge upper end is provided with W type end cap, described W type end cap refers to that its section is W shape, W type end cap circumference is shaped with O type and presents a theatrical performance as the last item on a programme, center is provided with column type and presents a theatrical performance as the last item on a programme, the column type center of presenting a theatrical performance as the last item on a programme is shaped with nut bore, column type is presented a theatrical performance as the last item on a programme and within 4 weeks, is provided with 4 playback circular holes, W type end cap upper-center is shaped with connection screwed pipe, the installation round platform that inner conical is covered end by described set screw nail is fastened on column type presents a theatrical performance as the last item on a programme, the W cavity that W type end cap lower end and W type sound film upper end are formed is air compressing chamber, the sound wave that the vibration of W type sound film produces blazes abroad from 4 playback circular holes in air compressing mode, described ring-like strong permanent magnet selects NdFeB material manufacture, pole orientation is radial, its inner circle and ring-like magnetic conduction cavity inner wall easy fit are installed, fixed by glue, the coil height of skeleton voice coil loudspeaker voice coil lower end is less than the height of strong permanent magnet, be positioned at the middle part of strong permanent magnet height, the inside and outside circle of skeleton voice coil loudspeaker voice coil keeps certain air gap with the inside and outside circle in magnetic gap respectively, the thicker enamel wire Double-wire parallel wound of coil of skeleton voice coil loudspeaker voice coil lower end, turn to two-layer coil, be respectively two coils, the two ends of two coils are all at coil upper end, the two ends of wherein two coils are connected into center tap, two coils merge to become a centre tapped coil, coil impedance is less than 1 Ω, power is about 500W, the center line of coil adds center tap, three lead-in wires guide to the left side in the middle part of described conical lid from coil upper end respectively, in, right-hand member, the conical surface of described inner conical lid is provided with a left side, in, right insolator disc, left, in, right insolator disc is provided with a left side, in, backhand welding contact pin, on the bonding pad of left and right, on difference connecting framework voice coil loudspeaker voice coil, the head and the tail of coil go between, middle bonding pad connecting coil center tap lead-in wire.
Signal generating circuit and audio power amplifier circuit is provided with in described siren horn machine box, the power end of signal generating circuit is connected filter capacitor with ground terminal, its power end connects 12V power end through dropping resistor, 12V power end connects filter capacitor, signal generating circuit mouth connects input resistance and input capacitance, input resistance ground connection, input capacitance connects small power amplifier integrated package signal input part, small power amplifier integrated package signal output part is through promoting electric capacity one road to driving transformer primary winding, another road is through feedback resistance, feedback capacity is to small power amplifier integrated package signal inverse feedback pole, feedback resistance connects shunt resistance ground connection, driving transformer primary winding connects weakening resistance, weakening electric capacity, 12V power end connects small power amplifier integrated package power end, the upper end of driving transformer output primary connects upper fet gate, output primary lower end connects lower fet gate, the drain electrode of upper and lower field effect transistor connects 12V power end jointly, upper and lower field effect transistor source electrode connects supersound projector voice coil loudspeaker voice coil two ends respectively, voice coil loudspeaker voice coil center tap ground connection, driving transformer output primary is provided with center tap, center tap connects zener diode positive pole, zener diode negative earth, zener diode positive pole connects biasing resistor, biasing resistor connects 12V power end, upper and lower protective resistance is connected respectively between upper and lower fet gate and source electrode, upper and lower field effect transistor connects into the push-pull type power amplification circuit of common drain, Direct driver loud speaker, push-pull type power amplification circuit is operated in class AB state, 12V power end connects 12V automobile power source positive pole through switch.
In audio power amplifier circuit, small power amplifier integrated package model is TDA2003, rate of turn is selected to be the small-sized driving transformer of 1:10, select voltage 100V, the upper and lower field effect transistor of VMOS of the N ditch type of electric current 50A, two pipe outer package bottom surfaces are installation of heat radiator respectively, select the zener diode of voltage 3.5V, select resistance 1K Ω, biasing resistor, select resistance 100 Ω, the protective resistance up and down of power 2W, output capacitance and filter capacitor select voltage 50V, the chemical capacitor of capacity 3000 μ F, input capacitance and feedback capacity select voltage 50V, the chemical capacitor of capacity 30 μ F, the resistance of input resistance is 100 Ω, the resistance of feedback resistance is 2K Ω, the resistance of shunt resistance is 50 Ω, the resistance of weakening resistance is 10 Ω, the capacity of weakening electric capacity is 0.1 μ F.
The beneficial effect of the vehicle-mounted siren horn of described high loudness is: the W type sound film of described compression sound producing head is equivalent to a voice coil loudspeaker voice coil and promotes two sound films, increase sound film and effectively vibrate area, the pyramidal structure good rigidly of W type sound film, lightweight, power-mass ratio obtains and increases substantially, therefore frequency response is good, the performance figure of effective raising loud speaker, centre tapped voice coil loudspeaker voice coil, directly mate with audio frequency power amplifier output circuit and be connected, save heavy output transformer, improve efficiency, increase the loudness of loud speaker, the integral structure section of compression sound producing head is also in W shape, not only structure is simple for the magnetic circuit system improved, and magnetic force is strong, overall weight is light, advantages.In described audio power amplifier circuit, upper and lower field effect transistor connects into the class AB push-pull output circuit of common drain, there is very dark inverse feedback, can improve power amplifier tonequality, improve power amplifier stability and reliability, field effect transistor outgoing current is large, loss is little, only utilize low pressure 12V automobile power source, just can produce the electric acoustic power of more than 500W, drive supersound projector to send high loudness chimes of doom.
Accompanying drawing explanation
Fig. 1 is the integral structure schematic diagram of the vehicle-mounted siren horn of high loudness.
Fig. 2 is high loudness vehicle-mounted siren horn audio frequency power amplifier electrical schematic diagram.
Detailed description of the invention
Further illustrate below in conjunction with accompanying drawing.
In the integral structure schematic diagram of the vehicle-mounted siren horn of high loudness shown in Fig. 1, described siren horn machine box 1 front end is provided with guidance panel 2, guidance panel is provided with some alarm songs and selects and function selection key 3, signal generating circuit and audio power amplifier circuit is provided with in machine box, described supersound projector is by W type frame, ring-like magnetic conduction cavity, ring-like strong permanent magnet, W type sound film, skeleton voice coil loudspeaker voice coil and W type end cap composition compression sound producing head, compression sound producing head upper end is provided with connection screwed pipe, connect on screwed pipe and reflective horn 4 is installed, described W type frame refers to that its section is W shape, with the overall stamping forming basin type support of iron sheet, male-tapered circle 5 is arranged with outside W type frame, centre is provided with inner conical lid 6, lower end is provided with ring-like magnetic conduction cavity 7, ring-like magnetic conduction cavity inner wall is provided with ring-like strong permanent magnet 8, ring-like strong permanent magnet upper end and ring-like magnetic conduction cavity inner wall upper end same plane, high-intensity magnetic field air gap 9 is formed between ring-like strong permanent magnet cylindrical and ring-like magnetic conduction chamber outer wall, ring-like magnetic conduction chamber outer wall upper end connects male-tapered circle lower end, ring-like magnetic conduction cavity inner wall upper end connects inner conical lid lower end, inner conical covers end and is provided with installation round platform 10, round platform is installed and is provided with centre hole and set screw nail 11, male-tapered circle upper end is provided with installing ring platform 12, installation round platform and installing ring platform are at same plane, the tapering of male-tapered circle is equal with the tapering of inner conical lid, described W type sound film refers to that its section is W shape, with the shaping basin type sound film of fiber reinforced resinous material overall processing, taper ring 13 is arranged with outside W type sound film, centre is provided with conical lid 14, lower end is provided with ring-like mounting groove 15, bonding skeleton voice coil loudspeaker voice coil 16 in ring-like mounting groove, skeleton voice coil loudspeaker voice coil lower end cylindrical coiling 17, conical lid upper end is provided with elastic wave sheet 18, taper ring upper end is provided with and plays ripple circle 19, elastic wave sheet and bullet ripple circle are at same plane, the tapering of taper ring is equal with the tapering of conical lid, W type sound film is arranged on W type frame upper end, skeleton voice coil loudspeaker voice coil is put in high-intensity magnetic field air gap, elastic wave sheet in the middle part of W type sound film is shaped with center positioning hole, the bullet ripple circle circumference of W type sound film circumference is mounting edge, mounting edge is adhesive on installing ring platform, mounting edge upper end is provided with W type end cap 20, described W type end cap refers to that its section is W shape, W type end cap circumference is shaped with O type and presents a theatrical performance as the last item on a programme 21, center is provided with column type and presents a theatrical performance as the last item on a programme 22, the column type center of presenting a theatrical performance as the last item on a programme is shaped with nut bore, column type is presented a theatrical performance as the last item on a programme and within 4 weeks, is provided with 4 playback circular holes 23, W type end cap upper-center is shaped with and connects screwed pipe 24, described set screw nail, installation round platform inner conical being covered end is fastened on column type presents a theatrical performance as the last item on a programme, the W cavity 25 that W type end cap lower end and W type sound film upper end are formed is air compressing chamber, during the vibration of W type sound film, the sound wave produced blazes abroad from 4 playback circular holes in air compressing mode, described ring-like strong permanent magnet selects NdFeB material manufacture, pole orientation is radial, its inner circle and ring-like magnetic conduction cavity inner wall easy fit are installed, fixed by glue, the coil height of skeleton voice coil loudspeaker voice coil lower end is less than the height of strong permanent magnet, be positioned at the middle part of strong permanent magnet height, the inside and outside circle of skeleton voice coil loudspeaker voice coil keeps certain air gap with the inside and outside circle in magnetic gap respectively, the thicker enamel wire Double-wire parallel wound of coil of skeleton voice coil loudspeaker voice coil lower end, turn to two-layer coil, be respectively two coils, the two ends of two coils are all at coil upper end, the two ends of wherein two coils are connected into center tap, two coils merge to become a centre tapped coil, coil impedance is less than 1 Ω, power is about 500W, the center line of coil adds center tap, three lead-in wires 26 guide to the left side in the middle part of described conical lid from coil upper end respectively, in, right-hand member, the conical surface of described inner conical lid is provided with a left side, in, right insolator disc 27, left, in, right insolator disc is provided with a left side, in, backhand welding contact pin 28, on the bonding pad of left and right, on difference connecting framework voice coil loudspeaker voice coil, the head and the tail of coil go between, middle bonding pad connecting coil center tap lead-in wire.
In the high loudness vehicle-mounted siren horn audio frequency power amplifier electrical schematic diagram shown in Fig. 2, signal generating circuit 29 and audio power amplifier circuit is provided with in described siren horn machine box, the power end of signal generating circuit is connected filter capacitor 30 with ground terminal, its power end connects 12V power end 32 through dropping resistor 31, 12V power end connects filter capacitor 33, signal generating circuit mouth connects input resistance 34 and input capacitance 35, input resistance ground connection, input capacitance connects small power amplifier integrated package 36 signal input part, small power amplifier integrated package signal output part is through promoting electric capacity 37 1 road to driving transformer 38 primary winding, another road is through feedback resistance 39, feedback capacity 40 is to small power amplifier integrated package signal inverse feedback pole, feedback resistance connects shunt resistance 41 ground connection, driving transformer primary winding connects weakening resistance 42, weakening electric capacity 43, 12V power end connects small power amplifier integrated package power end, the upper end of driving transformer output primary connects upper field effect transistor 44 grid, output primary lower end connects lower field effect transistor 45 grid, the drain electrode of upper and lower field effect transistor connects 12V power end jointly, upper and lower field effect transistor source electrode connects supersound projector voice coil loudspeaker voice coil two ends respectively, voice coil loudspeaker voice coil center tap ground connection, driving transformer output primary is provided with center tap, center tap connects zener diode 46 positive pole, zener diode negative earth, zener diode positive pole connects biasing resistor 47, biasing resistor connects 12V power end, upper and lower protective resistance 48 is connected respectively between upper and lower fet gate and source electrode, 49, upper and lower field effect transistor connects into the push-pull type power amplification circuit of common drain, Direct driver loud speaker, push-pull type power amplification circuit is operated in class AB state, 12V power end connects 12V automobile power source positive pole through switch.
In audio power amplifier circuit, small power amplifier integrated package model is TDA2003, rate of turn is selected to be the small-sized driving transformer of 1:10, select voltage 100V, the upper and lower field effect transistor of VMOS of the N ditch type of electric current 50A, two pipe outer package bottom surfaces are installation of heat radiator respectively, select the zener diode of voltage 3.5V, select the biasing resistor of resistance 1K Ω, select resistance 100 Ω, the protective resistance up and down of power 2W, select the dropping resistor of resistance 1K Ω, output capacitance and filter capacitor select voltage 50V, the chemical capacitor of capacity 3000 μ F, input capacitance and feedback capacity select voltage 50V, the chemical capacitor of capacity 30 μ F, the resistance of input resistance is 100 Ω, the resistance of feedback resistance is 2K Ω, the resistance of shunt resistance is 50 Ω, the resistance of weakening resistance is 10 Ω, the capacity of weakening electric capacity is 0.1 μ F.
Claims (3)
1. the vehicle-mounted siren horn of high loudness, be made up of siren horn machine box and supersound projector, it is characterized in that: described siren horn machine box (1) front end is provided with guidance panel (2), guidance panel is provided with some alarm songs and selects and function selection key (3), signal generating circuit and audio power amplifier circuit is provided with in machine box, described supersound projector is by W type frame, ring-like magnetic conduction cavity, ring-like strong permanent magnet, W type sound film, skeleton voice coil loudspeaker voice coil and W type end cap composition compression sound producing head, compression sound producing head upper end is provided with connection screwed pipe, connect on screwed pipe and reflective horn (4) is installed, described W type frame refers to that its section is W shape, with the overall stamping forming basin type support of iron sheet, male-tapered circle (5) is arranged with outside W type frame, centre is provided with inner conical lid (6), lower end is provided with ring-like magnetic conduction cavity (7), ring-like magnetic conduction cavity inner wall is provided with ring-like strong permanent magnet (8), ring-like strong permanent magnet upper end and ring-like magnetic conduction cavity inner wall upper end same plane, high-intensity magnetic field air gap (9) is formed between ring-like strong permanent magnet cylindrical and ring-like magnetic conduction chamber outer wall, ring-like magnetic conduction chamber outer wall upper end connects male-tapered circle lower end, ring-like magnetic conduction cavity inner wall upper end connects inner conical lid lower end, inner conical covers end and is provided with installation round platform (10), round platform is installed and is provided with centre hole and set screw nail (11), male-tapered circle upper end is provided with installing ring platform (12), installation round platform and installing ring platform are at same plane, the tapering of male-tapered circle is equal with the tapering of inner conical lid, described W type sound film refers to that its section is W shape, with the shaping basin type sound film of fiber reinforced resinous material overall processing, taper ring (13) is arranged with outside W type sound film, centre is provided with conical lid (14), lower end is provided with ring-like mounting groove (15), bonding skeleton voice coil loudspeaker voice coil (16) in ring-like mounting groove, skeleton voice coil loudspeaker voice coil lower end cylindrical coiling (17), conical lid upper end is provided with elastic wave sheet (18), taper ring upper end is provided with and plays ripple circle (19), elastic wave sheet and bullet ripple circle are at same plane, the tapering of taper ring is equal with the tapering of conical lid, W type sound film is arranged on W type frame upper end, skeleton voice coil loudspeaker voice coil is put in high-intensity magnetic field air gap, elastic wave sheet in the middle part of W type sound film is shaped with center positioning hole, the bullet ripple circle circumference of W type sound film circumference is mounting edge, mounting edge is adhesive on installing ring platform, mounting edge upper end is provided with W type end cap (20), described W type end cap refers to that its section is W shape, W type end cap circumference is shaped with O type and presents a theatrical performance as the last item on a programme (21), center is provided with column type and presents a theatrical performance as the last item on a programme (22), the column type center of presenting a theatrical performance as the last item on a programme is shaped with nut bore, column type is presented a theatrical performance as the last item on a programme and within 4 weeks, is provided with 4 playback circular holes (23), W type end cap upper-center is shaped with and connects screwed pipe (24), described set screw nail, installation round platform inner conical being covered end is fastened on column type presents a theatrical performance as the last item on a programme, the W cavity (25) that W type end cap lower end and W type sound film upper end are formed is air compressing chamber, during the vibration of W type sound film, the sound wave produced blazes abroad from 4 playback circular holes in air compressing mode, described ring-like strong permanent magnet selects NdFeB material manufacture, pole orientation is radial, its inner circle and ring-like magnetic conduction cavity inner wall easy fit are installed, fixed by glue, the coil height of skeleton voice coil loudspeaker voice coil lower end is less than the height of strong permanent magnet, be positioned at the middle part of strong permanent magnet height, the inside and outside circle of skeleton voice coil loudspeaker voice coil keeps certain air gap with the inside and outside circle in magnetic gap respectively, the thicker enamel wire Double-wire parallel wound of coil of skeleton voice coil loudspeaker voice coil lower end, turn to two-layer coil, be respectively two coils, the two ends of two coils are all at coil upper end, the two ends of wherein two coils are connected into center tap, two coils merge to become a centre tapped coil, coil impedance is less than 1 Ω, power is about 500W, the center line of coil adds center tap, three lead-in wires (26) guide to the left side in the middle part of described conical lid from coil upper end respectively, in, right-hand member, the conical surface of described inner conical lid is provided with a left side, in, right insolator disc (27), left, in, right insolator disc is provided with a left side, in, backhand welding contact pin (28), on the bonding pad of left and right, on difference connecting framework voice coil loudspeaker voice coil, the head and the tail of coil go between, middle bonding pad connecting coil center tap lead-in wire.
2. the vehicle-mounted siren horn of high loudness according to claim 1, it is characterized in that: in described siren horn machine box, be provided with signal generating circuit (29) and audio power amplifier circuit, the power end of signal generating circuit is connected filter capacitor (30) with ground terminal, its power end connects 12V power end (32) through dropping resistor (31), 12V power end connects filter capacitor (33), signal generating circuit mouth connects input resistance (34) and input capacitance (35), input resistance ground connection, input capacitance connects small power amplifier integrated package (36) signal input part, small power amplifier integrated package signal output part is through promoting electric capacity (37) one road to driving transformer (38) primary winding, another road is through feedback resistance (39), feedback capacity (40) is to small power amplifier integrated package signal inverse feedback pole, feedback resistance connects shunt resistance (41) ground connection, driving transformer primary winding connects weakening resistance (42), weakening electric capacity (43), 12V power end connects small power amplifier integrated package power end, the upper end of driving transformer output primary connects upper field effect transistor (44) grid, output primary lower end connects lower field effect transistor (45) grid, the drain electrode of upper and lower field effect transistor connects 12V power end jointly, upper and lower field effect transistor source electrode connects supersound projector voice coil loudspeaker voice coil two ends respectively, voice coil loudspeaker voice coil center tap ground connection, driving transformer output primary is provided with center tap, center tap connects zener diode (46) positive pole, zener diode negative earth, zener diode positive pole connects biasing resistor (47), biasing resistor connects 12V power end, upper and lower protective resistance (48) is connected respectively between upper and lower fet gate and source electrode, (49), upper and lower field effect transistor connects into the push-pull type power amplification circuit of common drain, Direct driver loud speaker, push-pull type power amplification circuit is operated in class AB state, 12V power end connects 12V automobile power source positive pole through switch.
3. the vehicle-mounted siren horn of high loudness according to claim 1, it is characterized in that: in audio power amplifier circuit, small power amplifier integrated package model is TDA2003, rate of turn is selected to be the small-sized driving transformer of 1:10, select voltage 100V, the upper and lower field effect transistor of VMOS of the N ditch type of electric current 50A, two pipe outer package bottom surfaces are installation of heat radiator respectively, select the zener diode of voltage 3.5V, select the biasing resistor of resistance 1K Ω, select resistance 100 Ω, the protective resistance up and down of power 2W, select the dropping resistor of resistance 1K Ω, output capacitance and filter capacitor select voltage 50V, the chemical capacitor of capacity 3000 μ F, input capacitance and feedback capacity select voltage 50V, the chemical capacitor of capacity 30 μ F, the resistance of input resistance is 100 Ω, the resistance of feedback resistance is 2K Ω, the resistance of shunt resistance is 50 Ω, the resistance of weakening resistance is 10 Ω, the capacity of weakening electric capacity is 0.1 μ F.
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| CN201510118467.0A CN104786926B (en) | 2015-03-18 | 2015-03-18 | The vehicle-mounted siren of high loudness |
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| CN104786926B CN104786926B (en) | 2016-10-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106231453A (en) * | 2016-09-28 | 2016-12-14 | 朱幕松 | High-quality card-inserted sound box |
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| CN202294684U (en) * | 2011-10-18 | 2012-07-04 | 湖北巴东博宇工贸有限公司 | Multifunctional police alarm |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4378471A (en) * | 1981-02-18 | 1983-03-29 | Ibuki Kogyo Co., Ltd. | Horn speaker with linear grooves in a front surface of a pole piece of a yoke |
| US4831656A (en) * | 1987-09-09 | 1989-05-16 | Southern Robert R | Conference microphone for use with hearing impaired amplification system |
| CN2075364U (en) * | 1990-10-23 | 1991-04-17 | 马福顺 | Multipurpose anti-theft alarm |
| CN201142105Y (en) * | 2008-01-12 | 2008-10-29 | 阜新金鼎防爆安全设备有限公司 | Explosion-proof fire acousto-optic alarm |
| CN202294684U (en) * | 2011-10-18 | 2012-07-04 | 湖北巴东博宇工贸有限公司 | Multifunctional police alarm |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231453A (en) * | 2016-09-28 | 2016-12-14 | 朱幕松 | High-quality card-inserted sound box |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104786926B (en) | 2016-10-05 |
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