CN203151435U - Audio input control and power amplification circuit - Google Patents
Audio input control and power amplification circuit Download PDFInfo
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- CN203151435U CN203151435U CN 201320031058 CN201320031058U CN203151435U CN 203151435 U CN203151435 U CN 203151435U CN 201320031058 CN201320031058 CN 201320031058 CN 201320031058 U CN201320031058 U CN 201320031058U CN 203151435 U CN203151435 U CN 203151435U
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Abstract
The utility model relates to the technical field of audio circuits of electronic equipment, in particular to an audio input control and power amplification circuit. The circuit comprises a main chip, a right channel ATV audio signal input circuit body, a right channel DVD audio signal input circuit body, a left channel ATV audio signal input circuit body, a left channel DVD audio signal input circuit body, a channel selection circuit body, a volume control circuit body and a mute control circuit body. The main chip is a 3-channel audio input chip with the model of 7299. According to the audio input control and power amplification circuit, 3-channel audio signal input control, signal power amplification and functions of operational amplification, volume control switching, audio power amplification and the like are achieved through the main chip, three chips of an operational amplification chip, a volume control switching chip and an audio power amplification chip of a prior audio circuit are replaced by the main chip, and accordingly, difficulties in designing of the circuit are reduced, PCB LAYOUT space and costs of the circuit are saved, and design costs are reduced.
Description
Technical field
The utility model relates to the voicefrequency circuit technical field of electronic equipment, relates in particular to a kind of audio frequency input control and power amplification circuit.
Background technology
The voicefrequency circuit of electronic equipment in the prior art, for the input control that realizes audio signal and the power amplification of audio signal, except needs amplifier chip (as: IC4558), when realizing ATV, because DVD master chip volume to signal when realizing these functions is directly to control, also need to increase the volume that volume control chip (as: IC2599) is controlled audio input signal separately, and because the tone squelch function that original circuit power amplifier chip (IC2822) does not carry, also need to increase the noise that a squelch circuit solves switching on and shutting down, namely need amplifier chip (as: IC4558), chip (as: IC2599) is switched in volume control, audio frequency power amplifier chip 3 chips such as (IC2822), the input control of ability audio signal and the power amplification of audio signal, like this, too much chip application has increased the difficulty of design, increased PCB LAYOUT(circuit-board laying-out) space and cost, also increased design cost simultaneously.
The utility model content
The purpose of this utility model is to provide a kind of audio frequency input to control and power amplification circuit at the deficiencies in the prior art, it has realized that by 3 channel audio input chip amplifier, volume control are switched and the function of audio frequency power amplifier, thereby has reduced the design difficulty of circuit, the PCB LAYOUT space of having saved circuit and cost, reduced design cost.
To achieve these goals, the utility model provides a kind of audio frequency input control and power amplification circuit, comprise master chip, R channel ATV audio signal input circuit, R channel DVD audio signal input circuit, L channel ATV audio signal input circuit, L channel DVD audio signal input circuit, channel selection circuit, volume control circuit, muting control circuit, described master chip is that a chips model is 7299 3 channel audios input chip; Described R channel ATV audio signal input circuit is connected with R channel first input pin of described master chip, described R channel DVD audio signal input circuit is connected with R channel second input pin of described master chip, described L channel ATV audio signal input circuit is connected with L channel first input pin of described master chip, and described L channel DVD audio signal input circuit is connected with L channel second input pin of described master chip; Described channel selection circuit is connected with the channel selecting pin of described master chip, and described volume control circuit, muting control circuit all are connected with the volume control pin of described master chip.
Preferably, the concrete chip model of described master chip is SL7299.
Preferably, described master chip also is provided with anodal right channel audio signal output pin, negative pole right channel audio signal output pin, anodal left channel audio signal output pin, negative pole left channel audio signal output pin, described anodal right channel audio signal output pin is connected with the positive terminal of R channel loudspeaker, described negative pole right channel audio signal output pin is connected with the negative pole end of R channel loudspeaker, described anodal left channel audio signal output pin is connected with the positive terminal of L channel loudspeaker, and described negative pole left channel audio signal output pin is connected with the negative pole end of L channel loudspeaker.
Preferably, described R channel ATV audio signal input circuit comprises capacitor C 111, resistance R 175, capacitor C 167, described capacitor C 111 1 ends are used for input R channel ATV audio signal, described capacitor C 111 other ends are connected with described resistance R 175 1 ends, described resistance R 175 other ends are connected with R channel first input pin of described capacitor C 167 1 ends, described master chip, described capacitor C 167 other end ground connection.
Preferably, described R channel DVD audio signal input circuit comprises capacitor C 160, resistance R 174, capacitor C 168, described capacitor C 160 1 ends are used for input R channel DVD audio signal, described capacitor C 160 other ends are connected with described resistance R 174 1 ends, described resistance R 174 other ends are connected with R channel second input pin of described capacitor C 168 1 ends, described master chip, described capacitor C 168 other end ground connection.
Preferably, described L channel ATV audio signal input circuit comprises capacitor C 112, resistance R 178, capacitor C 142, described capacitor C 112 1 ends are used for input L channel ATV audio signal, described capacitor C 112 other ends are connected with described resistance R 178 1 ends, described resistance R 178 other ends are connected with L channel first input pin of described capacitor C 142 1 ends, described master chip, described capacitor C 142 other end ground connection.
Preferably, described L channel DVD audio signal input circuit comprises capacitor C 159, resistance R 161, capacitor C 155, described capacitor C 159 1 ends are used for input L channel DVD audio signal, described capacitor C 159 other ends are connected with described resistance R 161 1 ends, described resistance R 161 other ends are connected with L channel second input pin of described capacitor C 155 1 ends, described master chip, described capacitor C 155 other end ground connection.
Preferably, described channel selection circuit comprises resistance R 186, triode Q21, resistance R 177, described resistance R 186 1 ends are used for input select signal, described resistance R 186 other ends are connected with the base stage of described triode Q21, the grounded emitter of described triode Q21, the collector electrode of described triode Q21 is connected with the channel selecting pin of described resistance R 177 1 ends, described master chip, described resistance R 177 another termination powers.
Preferably, described volume control circuit comprises resistance R 179, triode Q25, resistance R 180, resistance R 181, capacitor C 171, described resistance R 179 1 ends are used for the input volume control signal, described resistance R 179 other ends are connected with the base stage of described triode Q25, the grounded emitter of described triode Q25, the collector electrode of described triode Q25 is connected with described resistance R 180 1 ends, described resistance R 181 1 ends, described resistance R 180 another termination powers, described resistance R 181 other ends are connected with the volume control pin of described capacitor C 171 1 ends, described master chip; Described muting control circuit comprises resistance R 183, triode Q23, described resistance R 183 1 ends are used for the quiet control signal of input, described resistance R 183 other ends are connected with the base stage of described triode Q23, the grounded emitter of described triode Q23, the collector electrode of described triode Q23 is connected with the volume control pin of described master chip.
The utility model beneficial effect is: the utility model comprises master chip, R channel ATV audio signal input circuit, R channel DVD audio signal input circuit, L channel ATV audio signal input circuit, L channel DVD audio signal input circuit, channel selection circuit, volume control circuit, muting control circuit, and master chip is that a chips model is 7299 3 channel audios input chip; R channel ATV audio signal input circuit is connected with R channel first input pin of master chip, R channel DVD audio signal input circuit is connected with R channel second input pin of master chip, L channel ATV audio signal input circuit is connected with L channel first input pin of master chip, and L channel DVD audio signal input circuit is connected with L channel second input pin of master chip; Channel selection circuit is connected with the channel selecting pin of master chip, and volume control circuit, muting control circuit all are connected with the volume control pin of master chip.The utility model is input control and the signal power amplification that 3 a channel audios input chip has been realized 3 tunnel audio signals by master chip, and functions such as amplifier, volume control switching, audio frequency power amplifier, chip (as: IC2599), audio frequency power amplifier chip 3 chips such as (IC2822) are switched in amplifier chip (as: IC4558), the volume control that has substituted existing voicefrequency circuit, thereby have reduced the design difficulty of circuit, the PCB LAYOUT space of having saved circuit and cost, reduced design cost.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
Please refer to Fig. 1, audio frequency input control of the present utility model and power amplification circuit, comprise master chip 1, R channel ATV(television audio signals) audio signal input circuit 2, R channel DVD audio signal input circuit 3, L channel ATV audio signal input circuit 4, L channel DVD audio signal input circuit 5, channel selection circuit 6, volume control circuit 7, muting control circuit 8, master chip 1 is that a chips model is 7299 3 channel audios input chip; R channel ATV audio signal input circuit 2 is connected with R channel first input pin of master chip 1, R channel DVD audio signal input circuit 3 is connected with R channel second input pin of master chip 1, L channel ATV audio signal input circuit 4 is connected with L channel first input pin of master chip 1, and L channel DVD audio signal input circuit 5 is connected with L channel second input pin of master chip 1; Channel selection circuit 6 is connected with the channel selecting pin of master chip 1, and volume control circuit 7, muting control circuit 8 all are connected with the volume control pin of master chip 1.
Specifically, the concrete chip model of master chip 1 is SL7299; Wherein, master chip 1 also is provided with anodal right channel audio signal output pin (the 2nd pin), negative pole right channel audio signal output pin (the 24th pin), anodal left channel audio signal output pin (the 11st pin), negative pole left channel audio signal output pin (the 13rd pin), anodal right channel audio signal output pin is connected with the positive terminal (SPKR+) of R channel loudspeaker, negative pole right channel audio signal output pin is connected with the negative pole end (SPKR-) of R channel loudspeaker, anodal left channel audio signal output pin is connected with the positive terminal (SPKL+) of L channel loudspeaker, and negative pole left channel audio signal output pin is connected with the negative pole end (SPKL-) of L channel loudspeaker.
More particularly, R channel ATV audio signal input circuit 2 comprises capacitor C 111, resistance R 175, capacitor C 167, capacitor C 111 1 ends are used for input R channel ATV audio signal (AR), capacitor C 111 other ends are connected with resistance R 175 1 ends, resistance R 175 other ends are connected with R channel first input pin (the 4th pin) of capacitor C 167 1 ends, master chip 1, capacitor C 167 other end ground connection (GND).
More particularly, R channel DVD audio signal input circuit 3 comprises capacitor C 160, resistance R 174, capacitor C 168, capacitor C 160 1 ends are used for input R channel DVD audio signal (TV_AUDIOR), capacitor C 160 other ends are connected with resistance R 174 1 ends, resistance R 174 other ends are connected capacitor C 168 other end ground connection with R channel second input pin (the 5th pin) of capacitor C 168 1 ends, master chip 1.
More particularly, L channel ATV audio signal input circuit 4 comprises capacitor C 112, resistance R 178, capacitor C 142, capacitor C 112 1 ends are used for input L channel ATV audio signal (AL), capacitor C 112 other ends are connected with resistance R 178 1 ends, resistance R 178 other ends are connected capacitor C 142 other end ground connection with L channel first input pin (the 9th pin) of capacitor C 142 1 ends, master chip 1.
More particularly, L channel DVD audio signal input circuit 5 comprises capacitor C 159, resistance R 161, capacitor C 155, capacitor C 159 1 ends are used for input L channel DVD audio signal (TV_AUDIOL), capacitor C 159 other ends are connected with resistance R 161 1 ends, resistance R 161 other ends are connected capacitor C 155 other end ground connection with L channel second input pin (the 8th pin) of capacitor C 155 1 ends, master chip 1.
More particularly, channel selection circuit 6 comprises resistance R 186, triode Q21, resistance R 177, resistance R 186 1 ends are used for input select signal (TV_POWER), resistance R 186 other ends are connected with the base stage of triode Q21, the grounded emitter of triode Q21, the collector electrode of triode Q21 is connected with the channel selecting pin (the 21st pin) of resistance R 177 1 ends, master chip 1, resistance R 177 another termination powers (VCC).
More particularly, volume control circuit 7 comprises resistance R 179, triode Q25, resistance R 180, resistance R 181, capacitor C 171, resistance R 179 1 ends are used for input volume control signal (PWM_VOLUME), resistance R 179 other ends are connected with the base stage of triode Q25, the grounded emitter of triode Q25, the collector electrode of triode Q25 is connected with resistance R 180 1 ends, resistance R 181 1 ends, resistance R 180 another termination powers, resistance R 181 other ends are connected with the volume control pin (the 19th pin) of capacitor C 171 1 ends, master chip 1; Muting control circuit 8 comprises resistance R 183, triode Q23, resistance R 183 1 ends are used for input quiet control signal (AUDIO_MUTE), resistance R 183 other ends are connected with the base stage of triode Q23, the grounded emitter of triode Q23, the collector electrode of triode Q23 is connected with the volume control pin (the 19th pin) of master chip 1.
Operation principle of the present utility model is as follows:
The 4th pin of master chip 1, the 5th pin, the 6th pin are the R channel input pin of 3 tunnel audio signals, the 7th pin of master chip 1, the 8th pin, the 9th pin are the L channel input pin of 3 tunnel audio signals, when channel selecting pin (the 21st pin) is high level, master chip 1 inner passage selector switch can be selected 1 passage, the ATV audio signal of the 4th pin and the input of the 9th pin is carried out power amplification by electronic switch to inner power amplifier, outputs to loudspeaker from the 2nd pin and the 24th pin, the 11st pin and the 13rd pin respectively then; At the channel selecting pin when being low level, master chip 1 inner passage selector switch can be selected 2 passages, the DVD audio signal of the 5th pin and the input of the 8th pin is carried out power amplification by electronic switch to inner power amplifier, outputs to loudspeaker from the 2nd pin and the 24th pin, the 11st pin and the 13rd pin then; The 19th pin of master chip 1 is the volume control pin, the volume control signal PWM pulsewidth of master chip 1 through triode Q25 oppositely after, convert the DC level of 0～5V to by resistance R 181 and capacitor C 171,0V is minimal volume, 5V is max volume; Triode Q23 is quiet control, and in master chip 1 quiet pin output high level, oppositely making the 19th pin of master chip 1 by triode Q23 is that low level (being 0V) reaches quiet purpose.
Therefore, audio frequency input control of the present utility model and power amplification circuit, be that chip (as: IC2599), audio frequency power amplifier chip 3 chips such as (IC2822) are switched in amplifier chip (as: IC4558), the volume control that single the master chip 1 of SL7299 has substituted existing voicefrequency circuit by the chip model, namely reduce chip and the peripheral circuit of circuit, thereby reduced the design difficulty of circuit, the PCB LAYOUT space of having saved circuit and cost, reduced design cost.
Certainly, the parameter of above-mentioned (comprising in the accompanying drawing) electronic devices and components can be changed as required in actual applications, but all should belong to protection range of the present utility model.
Should be noted that at last; above embodiment is only in order to illustrate the technical solution of the utility model; but not to the restriction of the utility model protection range; although with reference to preferred embodiment the utility model has been done to explain; those of ordinary skill in the art is to be understood that; the technical solution of the utility model is made amendment or is equal to replacement, all belong to protection range of the present utility model.
Claims (9)
1. an audio frequency input is controlled and power amplification circuit, it is characterized in that: comprise master chip, R channel ATV audio signal input circuit, R channel DVD audio signal input circuit, L channel ATV audio signal input circuit, L channel DVD audio signal input circuit, channel selection circuit, volume control circuit, muting control circuit, described master chip is that a chips model is 7299 3 channel audios input chip;
Described R channel ATV audio signal input circuit is connected with R channel first input pin of described master chip, described R channel DVD audio signal input circuit is connected with R channel second input pin of described master chip, described L channel ATV audio signal input circuit is connected with L channel first input pin of described master chip, and described L channel DVD audio signal input circuit is connected with L channel second input pin of described master chip;
Described channel selection circuit is connected with the channel selecting pin of described master chip, and described volume control circuit, muting control circuit all are connected with the volume control pin of described master chip.
2. audio frequency input according to claim 1 is controlled and power amplification circuit, and it is characterized in that: the concrete chip model of described master chip is SL7299.
3. audio frequency input according to claim 1 and 2 is controlled and power amplification circuit, it is characterized in that: described master chip also is provided with anodal right channel audio signal output pin, negative pole right channel audio signal output pin, anodal left channel audio signal output pin, negative pole left channel audio signal output pin, described anodal right channel audio signal output pin is connected with the positive terminal of R channel loudspeaker, described negative pole right channel audio signal output pin is connected with the negative pole end of R channel loudspeaker, described anodal left channel audio signal output pin is connected with the positive terminal of L channel loudspeaker, and described negative pole left channel audio signal output pin is connected with the negative pole end of L channel loudspeaker.
4. audio frequency input according to claim 1 is controlled and power amplification circuit, it is characterized in that: described R channel ATV audio signal input circuit comprises capacitor C 111, resistance R 175, capacitor C 167, described capacitor C 111 1 ends are used for input R channel ATV audio signal, described capacitor C 111 other ends are connected with described resistance R 175 1 ends, described resistance R 175 other ends are connected with R channel first input pin of described capacitor C 167 1 ends, described master chip, described capacitor C 167 other end ground connection.
5. audio frequency input according to claim 1 is controlled and power amplification circuit, it is characterized in that: described R channel DVD audio signal input circuit comprises capacitor C 160, resistance R 174, capacitor C 168, described capacitor C 160 1 ends are used for input R channel DVD audio signal, described capacitor C 160 other ends are connected with described resistance R 174 1 ends, described resistance R 174 other ends are connected with R channel second input pin of described capacitor C 168 1 ends, described master chip, described capacitor C 168 other end ground connection.
6. audio frequency input according to claim 1 is controlled and power amplification circuit, it is characterized in that: described L channel ATV audio signal input circuit comprises capacitor C 112, resistance R 178, capacitor C 142, described capacitor C 112 1 ends are used for input L channel ATV audio signal, described capacitor C 112 other ends are connected with described resistance R 178 1 ends, described resistance R 178 other ends are connected with L channel first input pin of described capacitor C 142 1 ends, described master chip, described capacitor C 142 other end ground connection.
7. audio frequency input according to claim 1 is controlled and power amplification circuit, it is characterized in that: described L channel DVD audio signal input circuit comprises capacitor C 159, resistance R 161, capacitor C 155, described capacitor C 159 1 ends are used for input L channel DVD audio signal, described capacitor C 159 other ends are connected with described resistance R 161 1 ends, described resistance R 161 other ends are connected with L channel second input pin of described capacitor C 155 1 ends, described master chip, described capacitor C 155 other end ground connection.
8. audio frequency input according to claim 1 is controlled and power amplification circuit, it is characterized in that: described channel selection circuit comprises resistance R 186, triode Q21, resistance R 177, described resistance R 186 1 ends are used for input select signal, described resistance R 186 other ends are connected with the base stage of described triode Q21, the grounded emitter of described triode Q21, the collector electrode of described triode Q21 is connected with the channel selecting pin of described resistance R 177 1 ends, described master chip, described resistance R 177 another termination powers.
9. audio frequency input according to claim 1 is controlled and power amplification circuit, it is characterized in that: described volume control circuit comprises resistance R 179, triode Q25, resistance R 180, resistance R 181, capacitor C 171, described resistance R 179 1 ends are used for the input volume control signal, described resistance R 179 other ends are connected with the base stage of described triode Q25, the grounded emitter of described triode Q25, the collector electrode of described triode Q25 and described resistance R 180 1 ends, described resistance R 181 1 ends connect, described resistance R 180 another termination powers, described resistance R 181 other ends and described capacitor C 171 1 ends, the volume control pin of described master chip connects; Described muting control circuit comprises resistance R 183, triode Q23, described resistance R 183 1 ends are used for the quiet control signal of input, described resistance R 183 other ends are connected with the base stage of described triode Q23, the grounded emitter of described triode Q23, the collector electrode of described triode Q23 is connected with the volume control pin of described master chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320031058 CN203151435U (en) | 2013-01-21 | 2013-01-21 | Audio input control and power amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320031058 CN203151435U (en) | 2013-01-21 | 2013-01-21 | Audio input control and power amplification circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203151435U true CN203151435U (en) | 2013-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320031058 Expired - Fee Related CN203151435U (en) | 2013-01-21 | 2013-01-21 | Audio input control and power amplification circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107197406A (en) * | 2017-06-29 | 2017-09-22 | 广州国光音频科技有限公司 | A kind of Multifunctional audio integrated system |
-
2013
- 2013-01-21 CN CN 201320031058 patent/CN203151435U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107197406A (en) * | 2017-06-29 | 2017-09-22 | 广州国光音频科技有限公司 | A kind of Multifunctional audio integrated system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20180121 |
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| CF01 | Termination of patent right due to non-payment of annual fee |