CN2842876Y - Power amplifier capable of automatically switching left-right track output - Google Patents
Power amplifier capable of automatically switching left-right track output Download PDFInfo
- Publication number
- CN2842876Y CN2842876Y CN 200520066580 CN200520066580U CN2842876Y CN 2842876 Y CN2842876 Y CN 2842876Y CN 200520066580 CN200520066580 CN 200520066580 CN 200520066580 U CN200520066580 U CN 200520066580U CN 2842876 Y CN2842876 Y CN 2842876Y
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- circuit
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- amplification
- input
- sound column
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Abstract
The utility model discloses a power amplifier of a sound column, which is mainly composed of an input selection circuit, a preamplification/low-pass processing circuit, a control chip, a signal detection circuit, a rear stage power amplification circuit, a right channel load detection circuit, etc. When the utility model is externally connected with another passive sound column, the control chip controls the switching of a relay according to signals fed back by the right channel load detection circuit. Thereby, a left channel and a right channel of a main sound column are switched into the main sound column as the left channel, and the externally connected passive sound column is the right channel. Because the sound column can be directly arranged in a box body, an externally connected power amplifier is not needed. One sound column can be solely used, and two sound columns can be used (wherein one of the sound columns is the passive sound column). The two sound columns can automatically switch into the left and the right channels, and the operation is convenient.
Description
Technical field
The utility model relates to a kind of sound appliances, particularly relates to a kind of power amplifier of the left and right acoustic channels output of automaticallying switch.
Background technology
The sound column kind that the audio amplifier, particularly stereo set of sound system use at present use is a lot, and version is different, and pluses and minuses are respectively arranged.General sound column often uses as an audio amplifier, and self is not with power amplifier, and power amplifier is generally external, uses inconvenient.Though the sound column that has carries power amplifier, only as the power board of single sound column, it can't carry out the automatic switchover of left and right acoustic channels, and function is comparatively single.
The utility model content
The purpose of this utility model is to provide a kind of power amplifier of sound column easy to use, this power amplifier can realize automaticallying switch function of left and right sound channels output.
For achieving the above object, technical solution of the present utility model is:
The utility model is a kind of power amplifier of the left and right acoustic channels output sound column that can automatically switch, it mainly is made up of level power amplification circuit after input selection circuit, preposition amplification/low pass treatment circuit, prime amplification/low pass treatment circuit, back level power amplification circuit, control chip, input/amplifying circuit, power control circuit, the subwoofer, and input selection circuit carries out the input signal selection and audio signal is sent to preposition amplification/low pass treatment circuit according to the difference of outer signal; Preposition amplification/low pass treatment circuit carries out power amplification to the signal of input, signal is delivered to back level power amplification circuit again and is carried out sending middle and high sound loud speaker to after signal amplifies; Input selection circuit is sent to prime amplification/low pass treatment circuit with audio signal simultaneously, prime amplification/low pass treatment circuit carries out power amplification to the signal of input, low-pass filtering, the level power amplification circuit carries out sending woofer to after signal amplifies after low frequency signal being delivered to subwoofer again, it also comprises the R channel load detecting circuit, the input of described R channel load detecting circuit connects the output of control chip, when external another passive column, the switching of the signal control relay that control chip is fed back according to the R channel load detecting circuit realizes a sound column loud speaker left side, the switching of R channel.
After adopting such scheme,, need not external amplifirer because the utility model can directly be installed in the casing of sound column, very convenient to use.When having only a sound column, the loud speaker of this sound column (keynote post) can be play the function of left and right sound channels simultaneously; When external another passive column, the signal that R channel load detecting circuit on the utility model can detect another sound column automatically and fed back, and control relay switches the loud speaker of keynote post in view of the above, thereby realize that the keynote post is a L channel, external passive column is the function of R channel.
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is a circuit diagram of the present utility model.
Embodiment
As shown in Figure 1 and Figure 2, it mainly is made up of level power amplification circuit 17 (LM1875), power control circuit 18 and R channel load detecting circuit 19 (LM4558) after input selection circuit 11 (PT2313L), prime amplification/low pass treatment circuit 12 (TL084), preposition amplification/low pass treatment circuit 13 (LM324), control chip 14 (HT46R47), input/amplifying circuit 15 (LM324), back level power amplification circuit 16 (LM1876), the subwoofer.
Described control chip 14 inputs connect input/amplifying circuit 15, the output of control chip 14 connects power control circuit 18 and R channel load detecting circuit 19, control chip 14 has or not external sound column detection signal according to R channel load detecting circuit 19 feedbacks, relay J 2 in the control power control circuit 18 is switched, and realizes the switching of this sound column loud speaker left and right acoustic channels.That is, when external another passive column 101, power board switches to keynote post 100 with the left and right sound channels of keynote post 100 automatically and is L channel, and external passive column 101 is a R channel.
Input selection circuit 11 carries out the input signal selection and audio signal is sent to prime amplification/low pass treatment circuit 12 and preposition amplification/low pass treatment circuit 13 according to the difference of outer signal; The signal of 12 pairs of inputs of prime amplification/low pass treatment circuit carries out power amplification, low-pass filtering, low frequency signal is delivered to that a level power amplification circuit 17 carries out sending woofer SW to after signal amplifies after the subwoofer again; The signal of preposition amplification/13 pairs of inputs of low pass treatment circuit carries out power amplification, signal is delivered to back level power amplification circuit 16 again and is carried out sending middle and high sound loud speaker L, R to after signal amplifies.
Claims (1)
1, a kind of power amplifier of the left and right acoustic channels output sound column that can automatically switch, it mainly is made up of level power amplification circuit after input selection circuit, preposition amplification/low pass treatment circuit, prime amplification/low pass treatment circuit, back level power amplification circuit, control chip, input/amplifying circuit, power control circuit, the subwoofer, and input selection circuit carries out the input signal selection and audio signal is sent to preposition amplification/low pass treatment circuit according to the difference of outer signal; Preposition amplification/low pass treatment circuit carries out power amplification to the signal of input, signal is delivered to back level power amplification circuit again and is carried out sending middle and high sound loud speaker to after signal amplifies; Input selection circuit is sent to prime amplification/low pass treatment circuit with audio signal simultaneously, prime amplification/low pass treatment circuit carries out power amplification to the signal of input, low-pass filtering, the level power amplification circuit carries out sending woofer to after signal amplifies after low frequency signal being delivered to subwoofer again, it is characterized in that: it also comprises the R channel load detecting circuit, the input of described R channel load detecting circuit connects the output of control chip, the switching of the signal control relay that control chip can be fed back according to the R channel load detecting circuit realizes a sound column loud speaker left side, the switching of R channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520066580 CN2842876Y (en) | 2005-10-27 | 2005-10-27 | Power amplifier capable of automatically switching left-right track output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520066580 CN2842876Y (en) | 2005-10-27 | 2005-10-27 | Power amplifier capable of automatically switching left-right track output |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2842876Y true CN2842876Y (en) | 2006-11-29 |
Family
ID=37446746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520066580 Expired - Fee Related CN2842876Y (en) | 2005-10-27 | 2005-10-27 | Power amplifier capable of automatically switching left-right track output |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2842876Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9686628B2 (en) | 2014-07-04 | 2017-06-20 | Hon Hai Precision Industry Co., Ltd. | Audio channel control circuit |
| CN114786108A (en) * | 2022-03-07 | 2022-07-22 | 深圳市安耐科电子技术有限公司 | Configuration circuit for single sound channel power amplifier and audio playing device |
-
2005
- 2005-10-27 CN CN 200520066580 patent/CN2842876Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9686628B2 (en) | 2014-07-04 | 2017-06-20 | Hon Hai Precision Industry Co., Ltd. | Audio channel control circuit |
| CN114786108A (en) * | 2022-03-07 | 2022-07-22 | 深圳市安耐科电子技术有限公司 | Configuration circuit for single sound channel power amplifier and audio playing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061129 Termination date: 20101027 |