CN202759584U - Button type stereo handset earphone volume control circuit - Google Patents
Button type stereo handset earphone volume control circuit Download PDFInfo
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- CN202759584U CN202759584U CN 201220380049 CN201220380049U CN202759584U CN 202759584 U CN202759584 U CN 202759584U CN 201220380049 CN201220380049 CN 201220380049 CN 201220380049 U CN201220380049 U CN 201220380049U CN 202759584 U CN202759584 U CN 202759584U
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Abstract
The utility model discloses a button type stereo handset earphone volume control circuit, characterized by comprising a power supply processing circuit 105, a button processing circuit 101, a coding circuit 102, a L sound channel resistance switch array 103, a R sound channel resistance switch array 104 and a negative power supply multivoltage circuit 106. The button type stereo handset earphone volume control circuit outputs L and R sound channel sound signals outputted by a handset through serially-connected resistance switch arrays to realize handset volume adjustment. The utility model provides an earphone volume control circuit which can be used on any handset; meanwhile the power supply in the circuit utilizes a handset MIC pin direct current reference level as a power supply, thus provided current is small, self consumption of designed chips is very low and independent power supplies are not needed. The button type stereo handset earphone volume control circuit can also realize volume control of an outputted three-dimensional sound source.
Description
Technical field
The utility model relates to the technical field of earpiece volume control, relates in particular to the technical field of stereo handset earphone volume control.
Background technology
The handset earphone of usefulness has two kinds of situations on the market now, and the one, the earphone of each mobile phone brand bundle sale, this earphone can only be used on the corresponding mobile phone model, and other mobile phones can not use; The 2nd, the earphone that sells separately on the market, this earphone also can only be used on the type of appointment, can't be general.On function; the situation of handset earphone is very chaotic on the market; the earphone that has can not be regulated volume; the earphone that has need to carry out code is identified with interior of mobile phone; the adjusting volume that has is by transferring the mechanical type potentiometer to realize; volume is very large; the external battery that needs that has could be realized volume adjusting; there is equally this high problem of volume great achievement; patent 201120406664.X press key type universal mobile phone earphone sound volume regulating circuit is with left and right acoustic channels volume box together, namely can only realize the control of monophony volume.Thereby handset earphone on the market exist can not be general, the function imperfection, cost is high, uses the shortcomings such as inconvenient.
Summary of the invention
The utility model purpose is to provide a kind of button stereo handset earphone volume control circuit for the defective of prior art.
The utility model adopts following technical scheme for achieving the above object:
The stereo handset earphone volume control circuit of button is characterized in that: comprise power supply processing circuit 105, keystroke handling circuit 101, decoding circuit 102, L channel resistance switch array 103, R channel resistance switch array 104 and negative supply voltage-multiplying circuit 106;
The audio signal of the left and right acoustic channels of handset earphone output enters respectively L channel resistance switch array 103 and R channel resistance switch array 104 by resistance R 1 and resistance R 2 through VH1 pin and VH2 pin respectively, by controlling different resistance switchs, allow audio signal through different big or small resistance, output on the external earphone horn by VW1 pin and VW2 pin, thus the size of control volume;
Described L channel resistance switch array 103 R channel resistance switch arrays 104 comprise respectively resistance unit and the sliding unit of 8 series connection, two end points in each unit have the tapping point that can be accessed by sliding unit, data the adding in keystroke handling circuit 101 that the access of sliding unit tapping point position is inputted by two inputs of PU, PD/down counter counting, then realize by the electronic switch of Synchronization Control single contact after the decoder for decoding in the decoding circuit 102;
Described keystroke handling circuit 101 comprises volume rising PU counting input end and volume decline PD counting input end, and described two inputs meet respectively key switch S1, key switch S2; The PU input port has shake removal function, inside is connected to pull-up resistor, can keep at ordinary times the PU end to be high level, when PU end input low level, internal counter begins execution and adds counting, after decoding circuit 102 decoding the sliding unit of described L channel resistance switch array 103 and R channel resistance switch array 104 is moved up, the resistance between VH1 and the VW1, between VH2 and the VW2 reduces, and earphone horn SP1, SP2 volume increase synchronously; Same, the PD counting input end is used for volume and reduces;
Described power supply processing circuit 105 is that the DC potential with mobile phone MIC holding wire is treated as chip VDD power supply, negative supply voltage-multiplying circuit 106 and inner integrated capacitor C 1, C2 form the negative supply voltage-multiplying circuit, produce a negative supply and supply with L channel resistance switch array 103 and R channel resistance switch array 104, with guarantee audio signal by electric resistance array amplitude and the distortion factor, to keep the effect of stereo source of sound.
The utility model has been realized a kind of earphone sound volume control circuit that can use at any mobile phone, power supply in the utility model circuit is to utilize the dc reference level of mobile phone MIC pin as power supply simultaneously, thereby the electric current that can provide is less, so the oneself power consumption of the chip of design is very low, does not need independent power supply.The utility model can also be realized the volume control of the stereo source of sound exported.
Description of drawings
Fig. 1 is the utility model schematic diagram.
Embodiment
A kind of button stereophone volume control circuit mainly comprises: power supply processing circuit 105, negative supply voltage-multiplying circuit 106 as shown in Figure 1, keystroke handling circuit 101, decoding circuit 102, L channel resistance switch array 103, R channel resistance switch array 104 etc.
The principle of carrying out volume control in the utility model is different from conventional method, generally the volume adjusting utilization is the principle of electric resistance partial pressure, be about to a string resistance of signal input access to ground, volume output is taken out in the middle of resistance string, thereby get part voltage and realize volume adjusting, the resistance that this method needs is larger, be generally tens kilo-ohms, and the utility model is the method for utilizing the resistance series connection, being about to a string resistance string is connected between signal and the earphone horn, by changing the size of resistance, realize the adjusting to the loudspeaker electric current, thereby realize the adjusting to volume.
The utility model with the audio signal of the L channel of handset earphone output through resistance R 1 current limliting, then enter the L channel resistance switch array 103 of inside circuit by the VH1 pin, by controlling different resistance switchs, allow audio signal through different big or small resistance, output on the external L channel earphone horn SP1 by the VW1 pin, thus the size of control L channel volume; The audio signal of the R channel of handset earphone output is through resistance R 2 current limlitings, then enter the R channel resistance switch array 104 of inside circuit by the VH2 pin, by controlling different resistance switchs, allow audio signal through different big or small resistance, output on the external R channel earphone horn SP2 by the VW2 pin, thus the size of control R channel volume.L channel resistance switch array 103 is identical electric resistance arrays with R channel resistance switch array 104 inside, and by identical sequencing control, thereby the left and right acoustic channels that reaches volume adjusting carries out synchronously, realizes the effect of stereo volume control.
L channel resistance switch array 103 and R channel resistance switch array 104 comprise respectively the resistance unit of 8 series connection, two end points in each unit have the tapping point that can be accessed by sliding unit, data the adding in keystroke handling circuit 101 that the access of sliding unit tapping point position is inputted by two inputs of PU, PD/down counter counting, then realize by the electronic switch of Synchronization Control single contact separately after the decoder for decoding in the decoding circuit 102.
Input port is volume rising counting input end, has shake removal function, inside is connected to pull-up resistor, can keep at ordinary times the PU end to be high level, when PU end input low level, internal counter begins execution and adds counting, after decoding circuit 102 decodings, the slip output of L channel resistance switch array 103 and R channel resistance switch array 104 is moved up, resistance between VH1 and the VW1 is reduced, and the resistance between VH2 and the VW2 also reduces synchronously, and SP1 and SP2 volume increase synchronously.
Input port is volume decline counting input end, has shake removal function, inside is connected to pull-up resistor, can keep at ordinary times the PD end to be high level, when PD end input low level, internal counter begins execution and subtracts counting, after decoding circuit 102 decodings, the slip output of L channel resistance switch array 103 and R channel resistance switch array 104 is moved down, resistance between VH1 and the VW1 is increased, and the resistance between VH2 and the VW2 also increases synchronously, and SP1 and SP2 volume reduce synchronously.
Power supply in the utility model circuit is to utilize the dc reference level of mobile phone MIC pin as power supply, thereby the electric current that can provide is less, so chip adopts the low-voltage and low-power dissipation designing technique, oneself power consumption is very low.The resistance R 3 that needs simultaneously to go here and there between mobile phone MIC holding wire port and microphone is carried out current limliting, reduces the noise of microphone, reduces simultaneously the current drain of microphone, allows chip obtain larger electric current supply.
Power supply processing circuit 105 is the power vd D that the DC potential of mobile phone MIC holding wire are treated as chip, negative supply voltage-multiplying circuit 106 and inner integrated capacitor C 1, C2 forms the negative supply voltage-multiplying circuit, produce a negative supply and supply with L channel resistance switch array 103 and R channel resistance switch array 104, with guarantee audio signal by electric resistance array amplitude and the distortion factor, to keep the effect of stereo source of sound.
Claims (1)
1. the stereo handset earphone volume control circuit of button, it is characterized in that: comprise power supply processing circuit (105), keystroke handling circuit (101), decoding circuit (102), L channel resistance switch array (103), R channel resistance switch array (104) and negative supply voltage-multiplying circuit (106);
The audio signal of the left and right acoustic channels of handset earphone output enters respectively L channel resistance switch array (103) and R channel resistance switch array (104) by resistance R 1 and resistance R 2 through VH1 pin and VH2 pin respectively, by controlling different resistance switchs, allow audio signal through different big or small resistance, output on the external earphone horn by VW1 pin and VW2 pin, thus the size of control volume;
Described L channel resistance switch array (103) R channel resistance switch array (104) comprises respectively resistance unit and the sliding unit of 8 series connection, two end points in each unit have the tapping point that can be accessed by sliding unit, data the adding in keystroke handling circuit (101) that the access of sliding unit tapping point position is inputted by two inputs of PU, PD/down counter counting, then realize by the electronic switch of Synchronization Control single contact after the decoder for decoding in the decoding circuit (102);
Described keystroke handling circuit (101) comprises volume rising PU counting input end and volume decline PD counting input end, and described two inputs meet respectively key switch S1, key switch S2; The PU input port has shake removal function, inside is connected to pull-up resistor, can keep at ordinary times the PU end to be high level, when PU end input low level, internal counter begins execution and adds counting, after decoding circuit (102) decoding the sliding unit of described L channel resistance switch array (103) and R channel resistance switch array (104) is moved up, the resistance between VH1 and the VW1, between VH2 and the VW2 reduces, and earphone horn SP1, SP2 volume increase synchronously; Same, the PD counting input end is used for volume and reduces;
Described power supply processing circuit (105) is that the DC potential with mobile phone MIC holding wire is treated as chip VDD power supply, negative supply voltage-multiplying circuit (106) and inner integrated capacitor C 1, C2 form the negative supply voltage-multiplying circuit, produce a negative supply and supply with L channel resistance switch array (103) and R channel resistance switch array (104), to guarantee that audio signal is in amplitude and the distortion factor by electric resistance array, to keep the effect of stereo source of sound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220380049 CN202759584U (en) | 2012-08-01 | 2012-08-01 | Button type stereo handset earphone volume control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220380049 CN202759584U (en) | 2012-08-01 | 2012-08-01 | Button type stereo handset earphone volume control circuit |
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| Publication Number | Publication Date |
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| CN202759584U true CN202759584U (en) | 2013-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220380049 Expired - Lifetime CN202759584U (en) | 2012-08-01 | 2012-08-01 | Button type stereo handset earphone volume control circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104244122A (en) * | 2013-06-13 | 2014-12-24 | 无锡华润矽科微电子有限公司 | Drive-by-wire headset and volume control circuit thereof |
| CN104780484A (en) * | 2015-02-10 | 2015-07-15 | 深圳市奥星澳科技有限公司 | Earphone control circuit, line control equipment and volume adjustment earphone |
-
2012
- 2012-08-01 CN CN 201220380049 patent/CN202759584U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104244122A (en) * | 2013-06-13 | 2014-12-24 | 无锡华润矽科微电子有限公司 | Drive-by-wire headset and volume control circuit thereof |
| CN104244122B (en) * | 2013-06-13 | 2018-09-18 | 无锡华润矽科微电子有限公司 | A kind of line control earphone and its volume control circuit |
| CN104780484A (en) * | 2015-02-10 | 2015-07-15 | 深圳市奥星澳科技有限公司 | Earphone control circuit, line control equipment and volume adjustment earphone |
| CN104780484B (en) * | 2015-02-10 | 2016-08-17 | 深圳市奥星澳科技有限公司 | A kind of earphone control circuit, line traffic control equipment and tuning earphone |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130227 |