CN204697020U - A kind of dual output constant current-supplying circuit for preamplifier - Google Patents
A kind of dual output constant current-supplying circuit for preamplifier Download PDFInfo
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- CN204697020U CN204697020U CN201520214813.0U CN201520214813U CN204697020U CN 204697020 U CN204697020 U CN 204697020U CN 201520214813 U CN201520214813 U CN 201520214813U CN 204697020 U CN204697020 U CN 204697020U
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- electric capacity
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- operational amplifier
- integrated chip
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Abstract
The utility model discloses a kind of dual output constant current-supplying circuit for preamplifier, comprise battery, the first resistance to the 5th resistance, the first electric capacity to the 7th electric capacity, operational amplifier and Shi Ji integrated chip, the complementary output of profit operational amplifier, bipolar power supply required for just unipolarity Power convert can being become, first resistance and the second resistance form a voltage divider, the mid point of voltage divider receives the in-phase input end of operational amplifier, and be connected into voltage follower, be respectively the filter capacitor of positive and negative power supply.The 8th pin that positive supply is added to, the 4th pin that negative supply is added to.Due to the 7th pin output cathode, the first pin output negative pole.Compared with prior art, the utility model adopts several components and parts of minority can form the constant current-supplying circuit of dual output, is exclusively used in the power supply of the pre-amplification circuit of maintenance and making power amplifier, adopts electronic component few, with low cost, there is the value applied.
Description
Technical field
The utility model relates to a kind of preamplifier circuit construction of electric power of power amplifier, particularly relates to a kind of dual output constant current-supplying circuit for preamplifier.
Background technology
Power amplifier, is called for short " power amplifier ", refers under given distortion rate condition, can produce maximum power output to drive the amplifier of a certain load (such as loud speaker).Power amplifier serves in whole sound system " tissue, coordination " pivotal role, can dominate whole system to a certain extent provide good tonequality to export.In prior art, when overhauling or make the preamplifier in power amplifier, just need the power supply of dual output, but prior art being all integrated duplicate supply, therefore, needing one independently duplicate supply.
Utility model content
The purpose of this utility model just with a kind of dual output constant current-supplying circuit for preamplifier is provided to solve the problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The utility model comprises battery, first resistance is to the 5th resistance, first electric capacity is to the 7th electric capacity, operational amplifier and Shi Ji integrated chip, the positive pole of described battery simultaneously with the first end of described first resistance, the positive pole of described operational amplifier, the first end of described second electric capacity is connected with the 8th pin of base integrated chip time described, the negative pole of described battery simultaneously with the first end of described first electric capacity, the first end of described second electric capacity, the negative pole of described operational amplifier, the first end of described 3rd electric capacity, the first end of described 6th electric capacity, the first end of described 7th electric capacity is connected with the 4th pin of base integrated chip time described, second end of described first resistance simultaneously with the second end of described first electric capacity, second end of described second resistance is connected with the positive input of described operational amplifier, the reverse input end of described operational amplifier simultaneously with the output of described operational amplifier, second end of described second electric capacity is connected with the second end of described 3rd electric capacity, time described, the 5th pin of base integrated chip is connected with the first end of described 4th electric capacity, second end of described 4th electric capacity is positive signal input, second end of described 6th electric capacity is connected with the 6th pin of base integrated chip time described by described 5th resistance, time described, the 3rd pin of base integrated chip is connected with the first end of described 5th electric capacity, second end of described 5th electric capacity is negative signal input, second end of described 7th electric capacity is connected with the second pin of base integrated chip time described by described 4th resistance, time described, the 7th pin of base integrated chip is cathode power supply output, time described, the first pin of base integrated chip is negative power supply output.
Further, described operational amplifier is the operational amplifier of model TDA2030; Time described, base integrated chip is the time base integrated chip of model NE555.
The beneficial effects of the utility model with:
The utility model is a kind of dual output constant current-supplying circuit for preamplifier, compared with prior art, the utility model adopts several components and parts of minority can form the constant current-supplying circuit of dual output, be exclusively used in the power supply of the pre-amplification circuit of maintenance and making power amplifier, employing electronic component is few, with low cost, there is the value applied.
Accompanying drawing explanation
Fig. 1 is circuit structure schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1: the utility model comprises battery E, first resistance R1 is to the 5th resistance R5, first electric capacity C1 is to the 7th electric capacity C7, operational amplifier IC1 with time basis set become chip IC 2, the positive pole of battery E simultaneously with the first end of the first resistance R1, the positive pole of operational amplifier IC1, the first end of the second electric capacity C2 with time basis set become the 8th pin of chip IC 2 to be connected, the negative pole of battery E simultaneously with the first end of the first electric capacity C1, the first end of the second electric capacity C2, the negative pole of operational amplifier IC1, the first end of the 3rd electric capacity C3, the first end of the 6th electric capacity C6, the first end of the 7th electric capacity C7 with time basis set become the 4th pin of chip IC 2 to be connected, second end of the first resistance R1 simultaneously with second end of the first electric capacity C1, second end of the second resistance R2 is connected with the positive input of operational amplifier IC1, the reverse input end of operational amplifier IC1 simultaneously with the output of operational amplifier IC1, second end of the second electric capacity C2 is connected with second end of the 3rd electric capacity C3, time basis set become the 5th pin of chip IC 2 to be connected with the first end of the 4th electric capacity C4, second end of the 4th electric capacity C4 is positive signal input, second end of the 6th electric capacity C6 by the 5th resistance R5 with time basis set become the 6th pin of chip IC 2 to be connected, time basis set become the 3rd pin of chip IC 2 to be connected with the first end of the 5th electric capacity C5, second end of the 5th electric capacity C5 is negative signal input, second end of the 7th electric capacity C7 by the 4th resistance R4 with time basis set become the second pin of chip IC 2 to be connected, time basis set become the 7th pin of chip IC 2 to be cathode power supply output, time basis set become the first pin of chip IC 2 to be negative power supply output.
Further, operational amplifier IC1 is the operational amplifier of model TDA2030; Time the basis set time base integrated chip that becomes chip IC 2 to be model NE555.
Operation principle of the present utility model is as follows:
The complementary output of profit operational amplifier IC1, bipolar power supply required for just unipolarity Power convert can being become, first resistance R1 and the second resistance R2 forms a voltage divider, the mid point of voltage divider receives the in-phase input end of operational amplifier IC1, and IC1 is connected into voltage follower, make that " o one end is equal with " 0 " terminal potential." 0 " end is again virtual earth point. the earth terminal of it and input power is completely isolated.Be respectively the filter capacitor of positive and negative power supply.Positive supply is added to the 8th pin of 1C2, and negative supply is added to the 4th pin of IC2.Due to the 7th pin output cathode of IC2, the first pin output negative pole.
Component parameter of the present utility model is selected as follows:
First electric capacity C1 is 300uf, the second electric capacity C2 is 470uf, the 3rd electric capacity C3 is 100uf, the 4th electric capacity C4 is 1000uf, the 5th electric capacity C5 is 10uf, the 6th electric capacity C6 is 120uf, the 7th electric capacity C7 is 720uf, the first resistance R1 is 100 Ω, the second resistance R2 is 400 Ω, the 3rd resistance R3 is 500 Ω, the 4th resistance R4 is 2k Ω, the 5th resistance R5 is 27k Ω.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (2)
1. the dual output constant current-supplying circuit for preamplifier, its feature with: comprise battery, first resistance is to the 5th resistance, first electric capacity is to the 7th electric capacity, operational amplifier and Shi Ji integrated chip, the positive pole of described battery simultaneously with the first end of described first resistance, the positive pole of described operational amplifier, the first end of described second electric capacity is connected with the 8th pin of base integrated chip time described, the negative pole of described battery simultaneously with the first end of described first electric capacity, the first end of described second electric capacity, the negative pole of described operational amplifier, the first end of described 3rd electric capacity, the first end of described 6th electric capacity, the first end of described 7th electric capacity is connected with the 4th pin of base integrated chip time described, second end of described first resistance simultaneously with the second end of described first electric capacity, second end of described second resistance is connected with the positive input of described operational amplifier, the reverse input end of described operational amplifier simultaneously with the output of described operational amplifier, second end of described second electric capacity is connected with the second end of described 3rd electric capacity, time described, the 5th pin of base integrated chip is connected with the first end of described 4th electric capacity, second end of described 4th electric capacity is positive signal input, second end of described 6th electric capacity is connected with the 6th pin of base integrated chip time described by described 5th resistance, time described, the 3rd pin of base integrated chip is connected with the first end of described 5th electric capacity, second end of described 5th electric capacity is negative signal input, second end of described 7th electric capacity is connected with the second pin of base integrated chip time described by described 4th resistance, time described, the 7th pin of base integrated chip is cathode power supply output, time described, the first pin of base integrated chip is negative power supply output, time described, base integrated chip is the time base integrated chip of model NE555.
2. the dual output constant current-supplying circuit for preamplifier according to claim 1, its feature with: described operational amplifier is the operational amplifier of model TDA2030.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520214813.0U CN204697020U (en) | 2015-04-12 | 2015-04-12 | A kind of dual output constant current-supplying circuit for preamplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520214813.0U CN204697020U (en) | 2015-04-12 | 2015-04-12 | A kind of dual output constant current-supplying circuit for preamplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204697020U true CN204697020U (en) | 2015-10-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520214813.0U Expired - Fee Related CN204697020U (en) | 2015-04-12 | 2015-04-12 | A kind of dual output constant current-supplying circuit for preamplifier |
Country Status (1)
| Country | Link |
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| CN (1) | CN204697020U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732606A (en) * | 2018-06-04 | 2018-11-02 | 成都理工大学 | Place system before the parallel connection type fast current of digital current multiple tracks |
-
2015
- 2015-04-12 CN CN201520214813.0U patent/CN204697020U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732606A (en) * | 2018-06-04 | 2018-11-02 | 成都理工大学 | Place system before the parallel connection type fast current of digital current multiple tracks |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20151007 Termination date: 20170412 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |