CN105407435A - Audio adjusting circuit - Google Patents
Audio adjusting circuit Download PDFInfo
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- CN105407435A CN105407435A CN201510853980.4A CN201510853980A CN105407435A CN 105407435 A CN105407435 A CN 105407435A CN 201510853980 A CN201510853980 A CN 201510853980A CN 105407435 A CN105407435 A CN 105407435A
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Abstract
The invention relates to an audio adjusting circuit. The audio adjusting circuit is characterized by comprising a frequency modulation unit and a tone tuning unit, wherein the frequency modulation unit comprises a plurality of frequency point adjusting circuits; the frequency point adjusting circuits comprise voltage followers and potentiometers; one end of a resistor body of each of the potentiometers is connected with an audio input and a positive electrode input end of a first amplifier U207A; the other ends of the resistor bodies of the potentiometers are connected with a negative electrode input end of the first amplifier U207A; electric brushes of the potentiometers are connected with the voltage followers; and the tone tuning unit comprises a second amplifier U208A, a buffer U208C and three rotational potentiometers for adjusting a low tone, a medium tone and a high tone respectively. An input audio signal is subjected to frequency modulation of frequency points and frequency bands in sequence, namely, the audio signal is finely adjusted firstly and further adjusted as required. In the adjusting way, audio adjustment is distinguished more finely, so that tone tuning personnel can adjust tones conveniently. Moreover, through the circuit design, distortions in an audio adjusting process are reduced, and the tone quality is enhanced.
Description
Technical field:
The invention belongs to sound control field, relate to audio frequency regulating circuit.
Background technology:
Various players domestic at present, audio amplifier, the equipment that the sources of sound such as loud speaker export is very different on the market, various tonequality, quality, function, all extensively existing of price, and competition is very fierce, a lot of equipment all (comprises high pitch with multistage tuning, bass) function, but the source of sound output equipment of a lot of low side only only has simple volume adjusting, or only have the simple coarse adjustment of tuning narrow range, and for the output of source of sound usually with noise, uncomfortable to the auditory perception of people, and for the equipment of specialty, one cost is high, its two difficult operation, the equipment being similar to sound console does not have widely used value to ordinary consumer.
Summary of the invention:
The present invention seeks to solve the deficiencies in the prior art, provide a kind of and regulate simply, and audio is effective, the audio frequency regulating circuit that distortion is little, its technical scheme is as follows:
A kind of audio frequency regulating circuit, it is characterized in that: comprise frequency modulation unit and tuning unit, described frequency modulation unit comprises multiple Frequency point regulating circuit, each Frequency point regulating circuit comprises a voltage follower and a potentiometer, resistive element one end of potentiometer connects the electrode input end of audio frequency input and the first amplifier U207A respectively, the resistive element other end of potentiometer connects the negative input of the first amplifier U207A, and the brush of potentiometer connects a voltage follower; Described tuning unit comprises the second amplifier U208A, buffer U208C and is respectively used to regulate three rotational potentiometers of bass, middle pitch and high pitch, the negative input of the second amplifier U208A connects the output of the first amplifier U207A, the electrode input end ground connection of the second amplifier U208A, the output of the second amplifier U208A is connected to the input of buffer U208C, the output of buffer U208C connects three rotational potentiometers in parallel, and the output of buffer U208C is also connected with overload indicating circuit;
When after audio frequency input, frequency modulation unit to be promoted the audio signal in corresponding frequencies by the movement of potentiometer or decays, according to the height of frequency, high pitch, middle pitch and bass are divided into the audio frequency after frequency modulation, control to export the sound of the high pitch of sources of sound, middle pitch and bass respectively by three rotational potentiometers.
Further, described overload indicating circuit comprises triode Q202, triode Q203 and light-emitting diode D201, the base stage of triode Q202 connects the output of tuning unit through resistance R286, ground connection after contact resistance R12 between the emitter of the first triode Q1 and base stage, the collector electrode of triode Q202 is through electric capacity C271 ground connection, the collector electrode of the base stage connecting triode Q202 of triode Q203, the collector electrode of triode Q203 is through the collector electrode of resistance R13 connecting triode Q202, the collector electrode of triode Q203 also connects power supply through resistance R284, the grounded emitter of triode Q203, the collector electrode of triode Q203 and publicly between forward series connection light-emitting diode D201,
The ER effect exported when second amplifying circuit is large, triode Q202 conducting, and the collector voltage of triode Q202 is dragged down, triode Q203 conducting, thus impels light-emitting diode D2011 conducting, and lumination of light emitting diode is warned.
Further, described frequency modulation unit comprises these 10 Frequency points of 31Hz, 62Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz and 16Hz.
Further, described a kind of audio frequency regulating circuit also comprises power supply unit, described power supply unit comprises diode rectifier bridge D505, pressurizer U502 and pressurizer U503, 2 pin of described diode rectifier bridge D505 connect forward alternating current, 1 pin of diode rectifier bridge D505 connects the input of pressurizer U503 through resistance R515, 3 pin of diode rectifier bridge D505 connect Opposed crossing electricity, 4 pin of described diode rectifier bridge D505 connect the input of pressurizer U502, 4 pin of diode rectifier bridge D505 are also connected with the positive pole of electrode capacitance C506, there is the minus earth of electrode capacitance C506, 1 pin of described diode rectifier bridge D505 is also connected with the negative pole of electrode capacitance C511, there is the plus earth of electrode capacitance C511, the input of described voltage-stabiliser tube U502 is connected with electric capacity C507 and electric capacity C508, the input of described voltage-stabiliser tube U503 is connected with electric capacity C512 and electric capacity C513, the other end ground connection of electric capacity C507, electric capacity C508, electric capacity C512 and electric capacity C513, the output of described voltage-stabiliser tube U502 is that positive supply exports, and the output of described voltage-stabiliser tube U503 is that negative supply exports,
AC power converts DC power supply to after rectifier D505, and the positive-negative power that DC power supply converts 12V to after voltage-stabiliser tube U502 and voltage-stabiliser tube U503 voltage stabilizing exports.
Further, described in have electrode capacitance C507 identical with there being the value of electrode capacitance C512, have electrode capacitance C507 and have the value of electrode capacitance C512 to be 220U/35V, described electric capacity C508 is identical with the value of electric capacity C513, and the value of electric capacity C508 and electric capacity C513 is 0.01Uf.
Compared with prior art, beneficial effect of the present invention: the present invention by the audio signal of input first through the frequency modulation of Frequency point at the frequency modulation through frequency band, namely first fine tuning is carried out, further adjust according to demand, it is more careful that the adjustment of audio frequency is distinguished by this regulative mode, facilitate the adjustment of tuning personnel, and the design of this circuit makes the distortion in audio frequency adjustment process few, improves tonequality.
Accompanying drawing illustrates:
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is the schematic diagram of power supply unit in the present invention.
Embodiment:
Be below specific embodiments of the invention and by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiments.
As shown in Figure 1, a kind of audio frequency regulating circuit, comprise frequency modulation unit and tuning unit, described frequency modulation unit comprises multiple Frequency point regulating circuit 100, each Frequency point regulating circuit 100 comprises a voltage follower and a potentiometer, resistive element one end of potentiometer connects the electrode input end of audio frequency input and the first amplifier U207A respectively, and the resistive element other end of potentiometer connects the negative input of the first amplifier U207A, and the brush of potentiometer connects a voltage follower; Described tuning unit 200 comprises the second amplifier U208A, buffer U208C and is respectively used to regulate three rotational potentiometers of bass, middle pitch and high pitch, the negative input of the second amplifier U208A connects the output of the first amplifier U207A, the electrode input end ground connection of the second amplifier U208A, the output of the second amplifier U208A is connected to the input of buffer U208C, the output of buffer U208C connects three rotational potentiometers in parallel, and the output of buffer U208C is also connected with overload indicating circuit 300.
When after audio frequency input, frequency modulation unit to be promoted the audio signal in corresponding frequencies by the movement of potentiometer or decays, according to the height of frequency, high pitch, middle pitch and bass are divided into the audio frequency after frequency modulation, control to export the sound of the high pitch of sources of sound, middle pitch and bass respectively by three rotational potentiometers.
Overload indicating circuit 300 comprises triode Q202, triode Q203 and light-emitting diode D201, the base stage of triode Q202 connects the output of tuning unit through resistance R286, ground connection after contact resistance R12 between the emitter of the first triode Q1 and base stage, the collector electrode of triode Q202 is through electric capacity C271 ground connection, the collector electrode of the base stage connecting triode Q202 of triode Q203, the collector electrode of triode Q203 is through the collector electrode of resistance R13 connecting triode Q202, the collector electrode of triode Q203 also connects power supply through resistance R284, the grounded emitter of triode Q203, the collector electrode of triode Q203 and publicly between forward series connection light-emitting diode D201.
The ER effect exported when second amplifying circuit is large, triode Q202 conducting, and the collector voltage of triode Q202 is dragged down, triode Q203 conducting, thus impels light-emitting diode D2011 conducting, and lumination of light emitting diode is warned.
Frequency modulation unit comprises these 10 Frequency points of 31Hz, 62Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz and 16Hz.
As shown in Figure 2, above-mentioned audio frequency regulating circuit also comprises power supply unit 400, described power supply unit comprises diode rectifier bridge D505, pressurizer U502 and pressurizer U503, 2 pin of described diode rectifier bridge D505 connect forward alternating current, 1 pin of diode rectifier bridge D505 connects the input of pressurizer U503 through resistance R515, 3 pin of diode rectifier bridge D505 connect Opposed crossing electricity, 4 pin of described diode rectifier bridge D505 connect the input of pressurizer U502, 4 pin of diode rectifier bridge D505 are also connected with the positive pole of electrode capacitance C506, there is the minus earth of electrode capacitance C506, 1 pin of described diode rectifier bridge D505 is also connected with the negative pole of electrode capacitance C511, there is the plus earth of electrode capacitance C511, the input of described voltage-stabiliser tube U502 is connected with electric capacity C507 and electric capacity C508, the input of described voltage-stabiliser tube U503 is connected with electric capacity C512 and electric capacity C513, the other end ground connection of electric capacity C507, electric capacity C508, electric capacity C512 and electric capacity C513, the output of described voltage-stabiliser tube U502 is that positive supply exports, and the output of described voltage-stabiliser tube U503 is that negative supply exports.
AC power converts DC power supply to after rectifier D505, and the positive-negative power that DC power supply converts 12V to after voltage-stabiliser tube U502 and voltage-stabiliser tube U503 voltage stabilizing exports.
Above-mentioned has electrode capacitance C507 identical with there being the value of electrode capacitance C512, and have electrode capacitance C507 and have the value of electrode capacitance C512 to be 220U/35V, described electric capacity C508 is identical with the value of electric capacity C513, and the value of electric capacity C508 and electric capacity C513 is 0.01Uf.
The present invention by the audio signal of input first through the frequency modulation of Frequency point at the frequency modulation through frequency band, namely first fine tuning is carried out, further adjust according to demand, it is more careful that the adjustment of audio frequency is distinguished by this regulative mode, facilitate the adjustment of tuning personnel, and the design of this circuit makes the distortion in audio frequency adjustment process few, improves tonequality.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (5)
1. an audio frequency regulating circuit, it is characterized in that: comprise frequency modulation unit and tuning unit, described frequency modulation unit comprises multiple Frequency point regulating circuit, each Frequency point regulating circuit comprises a voltage follower and a potentiometer, resistive element one end of potentiometer connects the electrode input end of audio frequency input and the first amplifier U207A respectively, the resistive element other end of potentiometer connects the negative input of the first amplifier U207A, and the brush of potentiometer connects a voltage follower; Described tuning unit comprises the second amplifier U208A, buffer U208C and is respectively used to regulate three rotational potentiometers of bass, middle pitch and high pitch, the negative input of the second amplifier U208A connects the output of the first amplifier U207A, the electrode input end ground connection of the second amplifier U208A, the output of the second amplifier U208A is connected to the input of buffer U208C, the output of buffer U208C connects three rotational potentiometers in parallel, and the output of buffer U208C is also connected with overload indicating circuit;
When after audio frequency input, frequency modulation unit to be promoted the audio signal in corresponding frequencies by the movement of potentiometer or decays, according to the height of frequency, high pitch, middle pitch and bass are divided into the audio frequency after frequency modulation, control to export the sound of the high pitch of sources of sound, middle pitch and bass respectively by three rotational potentiometers.
2. a kind of audio frequency regulating circuit according to claim 1, it is characterized in that: described overload indicating circuit comprises triode Q202, triode Q203 and light-emitting diode D201, the base stage of triode Q202 connects the output of tuning unit through resistance R286, ground connection after contact resistance R12 between the emitter of the first triode Q1 and base stage, the collector electrode of triode Q202 is through electric capacity C271 ground connection, the collector electrode of the base stage connecting triode Q202 of triode Q203, the collector electrode of triode Q203 is through the collector electrode of resistance R13 connecting triode Q202, the collector electrode of triode Q203 also connects power supply through resistance R284, the grounded emitter of triode Q203, the collector electrode of triode Q203 and publicly between forward series connection light-emitting diode D201,
The ER effect exported when second amplifying circuit is large, triode Q202 conducting, and the collector voltage of triode Q202 is dragged down, triode Q203 conducting, thus impels light-emitting diode D2011 conducting, and lumination of light emitting diode is warned.
3. a kind of audio frequency regulating circuit according to claim 2, is characterized in that: described frequency modulation unit comprises these 10 Frequency points of 31Hz, 62Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz and 16Hz.
4. a kind of audio frequency regulating circuit according to claim 3, it is characterized in that: described audio frequency regulating circuit also comprises power supply unit, described power supply unit comprises diode rectifier bridge D505, pressurizer U502 and pressurizer U503, 2 pin of described diode rectifier bridge D505 connect forward alternating current, 1 pin of diode rectifier bridge D505 connects the input of pressurizer U503 through resistance R515, 3 pin of diode rectifier bridge D505 connect Opposed crossing electricity, 4 pin of described diode rectifier bridge D505 connect the input of pressurizer U502, 4 pin of diode rectifier bridge D505 are also connected with the positive pole of electrode capacitance C506, there is the minus earth of electrode capacitance C506, 1 pin of described diode rectifier bridge D505 is also connected with the negative pole of electrode capacitance C511, there is the plus earth of electrode capacitance C511, the input of described voltage-stabiliser tube U502 is connected with electric capacity C507 and electric capacity C508, the input of described voltage-stabiliser tube U503 is connected with electric capacity C512 and electric capacity C513, the other end ground connection of electric capacity C507, electric capacity C508, electric capacity C512 and electric capacity C513, the output of described voltage-stabiliser tube U502 is that positive supply exports, and the output of described voltage-stabiliser tube U503 is that negative supply exports,
AC power converts DC power supply to after rectifier D505, and the positive-negative power that DC power supply converts 12V to after voltage-stabiliser tube U502 and voltage-stabiliser tube U503 voltage stabilizing exports.
5. a kind of audio frequency regulating circuit according to claim 4, it is characterized in that: described in have electrode capacitance C507 identical with there being the value of electrode capacitance C512, there is electrode capacitance C507 and have the value of electrode capacitance C512 to be 220U/35V, described electric capacity C508 is identical with the value of electric capacity C513, and the value of electric capacity C508 and electric capacity C513 is 0.01Uf.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510853980.4A CN105407435A (en) | 2015-11-26 | 2015-11-26 | Audio adjusting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510853980.4A CN105407435A (en) | 2015-11-26 | 2015-11-26 | Audio adjusting circuit |
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| CN105407435A true CN105407435A (en) | 2016-03-16 |
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| CN201510853980.4A Pending CN105407435A (en) | 2015-11-26 | 2015-11-26 | Audio adjusting circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105187978A (en) * | 2015-08-04 | 2015-12-23 | 黑龙江真美广播通讯器材有限公司 | Outdoor portable solar illumination soundbox |
| CN107948829A (en) * | 2017-12-25 | 2018-04-20 | 广州市尊浪电器有限公司 | A kind of multimedia loudspeaker box |
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| CN1486061A (en) * | 2002-09-23 | 2004-03-31 | 上海卓忆科技发展有限公司 | DTMF signal debugging and testing instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105187978A (en) * | 2015-08-04 | 2015-12-23 | 黑龙江真美广播通讯器材有限公司 | Outdoor portable solar illumination soundbox |
| CN107948829A (en) * | 2017-12-25 | 2018-04-20 | 广州市尊浪电器有限公司 | A kind of multimedia loudspeaker box |
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Application publication date: 20160316 |
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