1、choose the correct meaning; (4) to correct the typos; (5) so the child write words (ABAB, and AABB); (6) in accordance with written words; (7) the complete word, and explain the meaning of the word; (8) collocation; (9) make sentences with the word; (10) the written language as required. (C) the mai
2、n sentence types (1) complete sentences; (2) write down the meaning of a sentence or expression of thoughts and feelings; (3) write sentences as required; (4) finish malalignment of the sentence; (5) modified sentences. 2, knowledge classification (1) the common conjunctions coordinate: . . 一面 . 1,
3、to examine the topic, identify problems associated with two 2, analysis, alternative question two is in direct proportion to the amount of the associated relationship is inversely proportional relationship. 3, and set unknown, column proportion type 4, and solutions proportion type 5, and test, wrot
4、e answer language plenary, and subject: application problem (1)-simple application problem and composite application problem review content simple application problem composite application problem answers application problem of general steps 1, and figure out meaning-through examines the, find known
5、 conditions and by seeking problem 2, and analysis number relationship-analysis known conditions Zhijian, and conditions and problem Zhijian of relationship, determine problem-solving method and problem-solving steps. 3, and column type calculation-lists formula, is out subdivisions 4, and test, and
6、 wrote answer-check, and checking, and wrote answers typical application problem 13, and subject: application problem (3)-column equation solutions application problem review content overview problem-solving steps 1, and figure out meaning, find by seeking of unknown and x said 2, and according to m
7、eaning find equivalent relationship, lists Equation 3, and solutions equation 4, and test, and wrote answers according to meaning find equivalent relationship of common method 1 , And according to common of number relationship type, established equivalent relationship 2, and according to has learn h
8、ad of calculation formula, 3, and according to problem in the of focus described sentence from overall Shang determine basic of equivalent relationship 4, and using segment figure, and list method, method analysis number实 验 报 告课程名称：_电路与模拟电子技术实验_ 指导老师：_成绩：_ 实验名称：_ 音频功率放大电路的设计制作调试_实验类型：_同组学生姓名：_一、实验目的
9、和要求（必填） 二、实验内容和原理（必填）三、主要仪器设备（必填） 四、操作方法和实验步骤五、实验数据记录和处理 六、实验结果与分析（必填）七、 讨论、心得一 实验目的和要求1.理解音频功率放大电路的工作原理；2.了解集成功率放大器的基本特点；3.了解音调控制原理，学习电路频率特性的测试；4.提高电子电路的综合调试能力。二实验内容和原理1.实验内容（1）组装焊接由三级运放组成的扩音机电路(电路原理图见下图) 。并仔细复查整机电路的接线是否正确无误；（2）分别测量各级电路的静态工作点；（3）测量前置级的增益；（4）测量音调级低音和高音增益调节范围；（5）测量功率放大级的增益；（6）测量功率放大级
10、最大不失真输出和最大功率( 不 带载) ；（7）测试整机增益；（8）测量频率特性；装 订 线choose the correct meaning; (4) to correct the typos; (5) so the child write words (ABAB, and AABB); (6) in accordance with written words; (7) the complete word, and explain the meaning of the word; (8) collocation; (9) make sentences with the word; (10)
11、 the written language as required. (C) the main sentence types (1) complete sentences; (2) write down the meaning of a sentence or expression of thoughts and feelings; (3) write sentences as required; (4) finish malalignment of the sentence; (5) modified sentences. 2, knowledge classification (1) th
12、e common conjunctions coordinate: . . 一面 . 1, to examine the topic, identify problems associated with two 2, analysis, alternative question two is in direct proportion to the amount of the associated relationship is inversely proportional relationship. 3, and set unknown, column proportion type 4, a
13、nd solutions proportion type 5, and test, wrote answer language plenary, and subject: application problem (1)-simple application problem and composite application problem review content simple application problem composite application problem answers application problem of general steps 1, and figur
14、e out meaning-through examines the, find known conditions and by seeking problem 2, and analysis number relationship-analysis known conditions Zhijian, and conditions and problem Zhijian of relationship, determine problem-solving method and problem-solving steps. 3, and column type calculation-lists
15、 formula, is out subdivisions 4, and test, and wrote answer-check, and checking, and wrote answers typical application problem 13, and subject: application problem (3)-column equation solutions application problem review content overview problem-solving steps 1, and figure out meaning, find by seeki
16、ng of unknown and x said 2, and according to meaning find equivalent relationship, lists Equation 3, and solutions equation 4, and test, and wrote answers according to meaning find equivalent relationship of common method 1 , And according to common of number relationship type, established equivalen
17、t relationship 2, and according to has learn had of calculation formula, 3, and according to problem in the of focus described sentence from overall Shang determine basic of equivalent relationship 4, and using segment figure, and list method, method analysis number（9）测量其它各项指标；（10）听音试验。2.实验原理（1）整机电路
18、音频功率放大电路，也即音响系统放大器，用于对音频信号的处理和放大。按其构成可分为前置放大级、音调控制级和功率放大级三部分。 扩音机的整机电路如下图所示，按其构成，可分为前置放大电路，音调控制电路和功率放大电路三部分。（2）前置放大电路choose the correct meaning; (4) to correct the typos; (5) so the child write words (ABAB, and AABB); (6) in accordance with written words; (7) the complete word, and explain the meani
19、ng of the word; (8) collocation; (9) make sentences with the word; (10) the written language as required. (C) the main sentence types (1) complete sentences; (2) write down the meaning of a sentence or expression of thoughts and feelings; (3) write sentences as required; (4) finish malalignment of t
20、he sentence; (5) modified sentences. 2, knowledge classification (1) the common conjunctions coordinate: . . 一面 . 1, to examine the topic, identify problems associated with two 2, analysis, alternative question two is in direct proportion to the amount of the associated relationship is inversely pro
21、portional relationship. 3, and set unknown, column proportion type 4, and solutions proportion type 5, and test, wrote answer language plenary, and subject: application problem (1)-simple application problem and composite application problem review content simple application problem composite applic
22、ation problem answers application problem of general steps 1, and figure out meaning-through examines the, find known conditions and by seeking problem 2, and analysis number relationship-analysis known conditions Zhijian, and conditions and problem Zhijian of relationship, determine problem-solving
23、 method and problem-solving steps. 3, and column type calculation-lists formula, is out subdivisions 4, and test, and wrote answer-check, and checking, and wrote answers typical application problem 13, and subject: application problem (3)-column equation solutions application problem review content
24、overview problem-solving steps 1, and figure out meaning, find by seeking of unknown and x said 2, and according to meaning find equivalent relationship, lists Equation 3, and solutions equation 4, and test, and wrote answers according to meaning find equivalent relationship of common method 1 , And
25、 according to common of number relationship type, established equivalent relationship 2, and according to has learn had of calculation formula, 3, and according to problem in the of focus described sentence from overall Shang determine basic of equivalent relationship 4, and using segment figure, an
26、d list method, method analysis number前置放大级的性能对整个音频功放电路的影响很大，为了减小噪声，前置级通常要选用低噪声的运放。另外，如输入线的屏蔽情况，地线的安装等等都对噪声有很大影响。由 A1 组成的前置放大电路是一个同相输入比例放大器。(C2 克服自激）理想闭环电压放大倍数为输入电阻 Rif=R 1 ，输出电阻 Rof=0（3）音调控制电路常用的音调控制电路有三种形式，一是衰减式 RC 音调控制电路，其调节范围宽，但容易产生失真；另一种是反馈型音调控制电路，其调节范围小一些，但失真小；第三种是混合式音调控制电路，其电路复杂，多用于高级收录机。为使电路简
27、单而失真又小，本音调集成功率电路中采用了由阻容网络组成的 RC 型负反馈音调控制电路。它是通过不同的负反馈网络和输入网络造成放大器闭环放大倍数随信号频率不同而改变，从而达到音调控制的目的。choose the correct meaning; (4) to correct the typos; (5) so the child write words (ABAB, and AABB); (6) in accordance with written words; (7) the complete word, and explain the meaning of the word; (8) col
28、location; (9) make sentences with the word; (10) the written language as required. (C) the main sentence types (1) complete sentences; (2) write down the meaning of a sentence or expression of thoughts and feelings; (3) write sentences as required; (4) finish malalignment of the sentence; (5) modifi
29、ed sentences. 2, knowledge classification (1) the common conjunctions coordinate: . . 一面 . 1, to examine the topic, identify problems associated with two 2, analysis, alternative question two is in direct proportion to the amount of the associated relationship is inversely proportional relationship.
30、 3, and set unknown, column proportion type 4, and solutions proportion type 5, and test, wrote answer language plenary, and subject: application problem (1)-simple application problem and composite application problem review content simple application problem composite application problem answers a
31、pplication problem of general steps 1, and figure out meaning-through examines the, find known conditions and by seeking problem 2, and analysis number relationship-analysis known conditions Zhijian, and conditions and problem Zhijian of relationship, determine problem-solving method and problem-sol
32、ving steps. 3, and column type calculation-lists formula, is out subdivisions 4, and test, and wrote answer-check, and checking, and wrote answers typical application problem 13, and subject: application problem (3)-column equation solutions application problem review content overview problem-solvin
33、g steps 1, and figure out meaning, find by seeking of unknown and x said 2, and according to meaning find equivalent relationship, lists Equation 3, and solutions equation 4, and test, and wrote answers according to meaning find equivalent relationship of common method 1 , And according to common of
34、 number relationship type, established equivalent relationship 2, and according to has learn had of calculation formula, 3, and according to problem in the of focus described sentence from overall Shang determine basic of equivalent relationship 4, and using segment figure, and list method, method a
35、nalysis number（4）功率放大级该电路中 TDA2030A 为15V ，负载电阻为 8 时，输出功率为 8W 功放级电路中，电容C15，C16 用作电源滤波。D1 和 D2 为保护二极管。R11 、C10 为输出端校正网络以补偿感性负载，避免自激和过电压。choose the correct meaning; (4) to correct the typos; (5) so the child write words (ABAB, and AABB); (6) in accordance with written words; (7) the complete word, and
36、explain the meaning of the word; (8) collocation; (9) make sentences with the word; (10) the written language as required. (C) the main sentence types (1) complete sentences; (2) write down the meaning of a sentence or expression of thoughts and feelings; (3) write sentences as required; (4) finish
37、malalignment of the sentence; (5) modified sentences. 2, knowledge classification (1) the common conjunctions coordinate: . . 一面 . 1, to examine the topic, identify problems associated with two 2, analysis, alternative question two is in direct proportion to the amount of the associated relationship
38、 is inversely proportional relationship. 3, and set unknown, column proportion type 4, and solutions proportion type 5, and test, wrote answer language plenary, and subject: application problem (1)-simple application problem and composite application problem review content simple application problem
39、 composite application problem answers application problem of general steps 1, and figure out meaning-through examines the, find known conditions and by seeking problem 2, and analysis number relationship-analysis known conditions Zhijian, and conditions and problem Zhijian of relationship, determin
40、e problem-solving method and problem-solving steps. 3, and column type calculation-lists formula, is out subdivisions 4, and test, and wrote answer-check, and checking, and wrote answers typical application problem 13, and subject: application problem (3)-column equation solutions application proble
41、m review content overview problem-solving steps 1, and figure out meaning, find by seeking of unknown and x said 2, and according to meaning find equivalent relationship, lists Equation 3, and solutions equation 4, and test, and wrote answers according to meaning find equivalent relationship of comm
42、on method 1 , And according to common of number relationship type, established equivalent relationship 2, and according to has learn had of calculation formula, 3, and according to problem in the of focus described sentence from overall Shang determine basic of equivalent relationship 4, and using s
43、egment figure, and list method, method analysis number（5）扩音机电路一些主要技术指标choose the correct meaning; (4) to correct the typos; (5) so the child write words (ABAB, and AABB); (6) in accordance with written words; (7) the complete word, and explain the meaning of the word; (8) collocation; (9) make sente
44、nces with the word; (10) the written language as required. (C) the main sentence types (1) complete sentences; (2) write down the meaning of a sentence or expression of thoughts and feelings; (3) write sentences as required; (4) finish malalignment of the sentence; (5) modified sentences. 2, knowled
45、ge classification (1) the common conjunctions coordinate: . . 一面 . 1, to examine the topic, identify problems associated with two 2, analysis, alternative question two is in direct proportion to the amount of the associated relationship is inversely proportional relationship. 3, and set unknown, col
46、umn proportion type 4, and solutions proportion type 5, and test, wrote answer language plenary, and subject: application problem (1)-simple application problem and composite application problem review content simple application problem composite application problem answers application problem of ge
47、neral steps 1, and figure out meaning-through examines the, find known conditions and by seeking problem 2, and analysis number relationship-analysis known conditions Zhijian, and conditions and problem Zhijian of relationship, determine problem-solving method and problem-solving steps. 3, and colum
48、n type calculation-lists formula, is out subdivisions 4, and test, and wrote answer-check, and checking, and wrote answers typical application problem 13, and subject: application problem (3)-column equation solutions application problem review content overview problem-solving steps 1, and figure out meaning, find by seeking of unknown and x said 2, and according to meaning find equivalent relationship, lists Equation 3, and solutions equation 4, and test, and wrote answers according to meaning find equivalent relationship of common method 1 , And according to common of
