CN201919146U - Sound box provided with adjustable potentiometers and squeal-preventive device - Google Patents
Sound box provided with adjustable potentiometers and squeal-preventive device Download PDFInfo
- Publication number
- CN201919146U CN201919146U CN2011200211216U CN201120021121U CN201919146U CN 201919146 U CN201919146 U CN 201919146U CN 2011200211216 U CN2011200211216 U CN 2011200211216U CN 201120021121 U CN201120021121 U CN 201120021121U CN 201919146 U CN201919146 U CN 201919146U
- Authority
- CN
- China
- Prior art keywords
- loudspeaker
- capacitor
- inductance
- adjustable potentiometer
- fuse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- Circuit For Audible Band Transducer (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
A sound box provided with adjustable potentiometers and a squeal-preventive device comprises a capacitor and loudspeakers and is characterized in that a fuse and one adjustable potentiometer are serially connected between the capacitor and an input end of the high-tone loudspeaker, and another adjustable potentiometer is serially connected between the capacitor and an input end of an intermediate-frequency loudspeaker. By means of adopting a circuit serially connected with the fuse and the adjustable potentiometer, the sound box can effectively prevent current from being increased sharply to burn the high-tone loudspeaker, generate squeal and the like.
Description
Technical field the utility model relates to transaudient loudspeaker box device field, relates to a kind of with adjustable potentiometer prevent from the to utter long and high-pitched sounds audio amplifier of device concretely.
Popular various audio amplifiers on the background technology market, do not prevent that all loudspeaker from increasing the device of Burnout circuit suddenly because of electric current, do not cause that because of sing karaoke etc. electric current increases the prevent mean that produces sharp-pointed howling suddenly yet, so, in use often burn loudspeaker, produce ear-piercing incident of uttering long and high-pitched sounds and take place.
The summary of the invention the purpose of this utility model is the shortcoming that exists at above-mentioned audio amplifier, open a kind of audio amplifier of system with adjustable potentiometer and fuse, be installed in the audio amplifier circuit, can prevent effectively that loudspeaker from increasing Burnout circuit suddenly because of electric current, and prevent the howling that height, intermediate frequency loudspeaker send suddenly.The utility model belongs to the improvement of audio amplifier circuit, particularly one increases fuse and adjustable potentiometer in the audio amplifier circuit, band adjustable potentiometer that loudspeaker prevents to utter long and high-pitched sounds is in time reconciled, prevented to burn to the purpose that can use according to audio amplifier, the audio amplifier of the device that prevents to utter long and high-pitched sounds.
The utility model is achieved in that
In the high-frequency circuit in original audio amplifier frequency dividing circuit; connect a fuse and an adjustable potentiometer; adjustable potentiometer of series connection in intermediate-frequency circuit (resistance 3 ohm to 6 ohm variable resistor) is during at sing karaoke; if microphone and audio amplifier interact and produce the self-excitation electric current; acoustic pressure can be effectively controlled in variable resistor work; so can not produce utter long and high-pitched sounds, when electric current increases suddenly, fuse can fuse at first automatically, the protection loudspeaker can not burn.
The technical solution that the utility model adopted is: band adjustable potentiometer prevent from the to utter long and high-pitched sounds audio amplifier of device is by signal input part, capacitor I, fuse, variable resistor I, loudspeaker input, inductance A, intermediate frequency loudspeaker input, inductance B, inductance C, capacitor I, capacitor I I, capacitor II, bass horn, variable resistor II, inductance D.In conjunction with the accompanying drawings and embodiments, further describe the principle of the utility model circuit: from the audible communication signal of sound amplifier input from signal input part, be transported to the loudspeaker input through series capacitors I, fuse and variable resistor I, inductance C, make the loudspeaker pronunciation; From signal input part, through series capacitors II, inductance A and variable resistor II, inductance B capacitor I, be input to intermediate frequency loudspeaker input, make the loudspeaker pronunciation; From signal input part, be transported to the bass horn pronunciation through inductance D capacitor I I, and high pitch, middle pitch, bass rationally merge the high fidelity reduction that realizes sound.The resistance variable range of variable resistor I and II is different, thereby thereby the difference by resistance in circuit influence the center frequency point of the voltage and current change senior middle school low frequency of electric capacity, inductance.Capacitor I and II are capacitors, and be different with capacitance at the withstand voltage of the different selected electric capacity of frequency, all plays isolated direct current, the filter action of conducting alternating current.Capacitor I and II are electric capacity, and be different with capacitance at the withstand voltage of the different selected electric capacity of frequency, all plays isolated direct current, the effect of conducting alternating current filtering.Inductance A, B, C, D are inductors, and the induction reactance difference at the different selected inductance of frequency plays the effect of filtering high-frequency signal.
Owing to adopt circuit series connection fuse of the present utility model and adjustable potentiometer, can effectively prevent the generation that electric current increases, burns loudspeaker suddenly, produces accidents such as uttering long and high-pitched sounds.
Description of drawings
Fig. 1 is a simplified schematic diagram of the present utility model.
Embodiment
Fig. 1 is an audio amplifier circuit diagram of the present utility model, and Reference numeral shown in Figure 1 is as follows, signal input part 1, capacitor I2, fuse 3, variable resistor I4, loudspeaker input 5, inductance A6, intermediate frequency loudspeaker input 7, inductance B8, inductance C9, capacitor I 10, capacitor I I11, capacitor II12, bass horn 13, variable resistor II14, inductance D15.In conjunction with the accompanying drawings and embodiments, further describe the principle of the utility model circuit: from the audible communication signal of sound amplifier input from signal input part 1, be transported to loudspeaker input 5 through series capacitors I2, fuse 3 and variable resistor I4, inductance C9, make the loudspeaker pronunciation; From signal input part 1, through series capacitors II12, inductance A6 and variable resistor II14, inductance B8 capacitor I 10, be input to intermediate frequency loudspeaker input 7, make the loudspeaker pronunciation; From signal input part 1, be transported to bass horn 13 pronunciations through inductance D15 capacitor I I11, and high pitch, middle pitch, bass rationally merge the high fidelity reduction that realizes sound.
Claims (1)
1. the band adjustable potentiometer audio amplifier of device that prevents to utter long and high-pitched sounds is made up of electric capacity and loudspeaker, it is characterized in that in the middle of electric capacity and loudspeaker input, and connect a fuse and an adjustable potentiometer, in the middle of electric capacity and intermediate frequency loudspeaker input, the adjustable potentiometer of connecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200211216U CN201919146U (en) | 2011-01-18 | 2011-01-18 | Sound box provided with adjustable potentiometers and squeal-preventive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200211216U CN201919146U (en) | 2011-01-18 | 2011-01-18 | Sound box provided with adjustable potentiometers and squeal-preventive device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201919146U true CN201919146U (en) | 2011-08-03 |
Family
ID=44418934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200211216U Expired - Lifetime CN201919146U (en) | 2011-01-18 | 2011-01-18 | Sound box provided with adjustable potentiometers and squeal-preventive device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201919146U (en) |
-
2011
- 2011-01-18 CN CN2011200211216U patent/CN201919146U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110803 |