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#第六届立创电赛#低成本的基于LM1875的2声道音频放大器

创建时间:3年前

描述

<div class="document"> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> 1、项目功能介绍</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;font-size:14px;">这个设计是一个双通道带音调前端的OCL功放,基于LM1875T的Class AB功放IC设计。在音频DIY圈子里LM1875一直是一个不朽的史诗传奇IC——经常可以听到有人说1875的声音柔和、有胆味、人声甜美等等,这里不多叙述~总之这里两个1875分别控制两个独立的声道。带有高音低音两个衰减器的前端,这样可以更加方便的突出乐曲在某个频段的表现力。</span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*2、项目属性</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;"><span style="font-size:14px;">这是一个开源的首次公开的项目,由我本人设计。</span></span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">* 3、开源协议</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;"><span style="font-size:14px;">本项目使用GPL v3协议开源,原作者保留署名的权益。</span></span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*4、硬件部分</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><img src="//image.lceda.cn/pullimage/xETx7iFcCjE4hMdjlSKosf0habPz2wkKZqeYZTjW.png" alt="" width="1200" height="362">这张图展示了我们的前级输入,其中两个WH148电位器是我们的高音与低音的调节旋钮。C3、C4与C12、C11分别为两个通道建立了低通滤波LPF,C5、C6与C10、C9分别为两个通道建立了高通滤波器HPF,将他们输出串联一个电容来隔离后级的干扰。随后二者的输出接到了下一级二十倍的功率放大级</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><img src="//image.lceda.cn/pullimage/P9rAbVlu7YbFukQeg4G3ZttgyH0Hz9vobjsU2F9v.png" alt="" width="989" height="272"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">在这一级是典型的同向运算放大电路,输出并接的电容与电阻可以为我们消除低频振荡。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">其中在负反馈中的两个1uF电容则可以稳定运放输出的零电位,后续我们可以尝试将其短路,若电位漂移不超过±30mV则可以省略,这可以有助于音质的改善。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">其中Logo那里将会有灯光BUFF彩蛋~静待板子到手</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">--灯光部分误铺铜了结果就看不到灯了/哭死</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;"><span style="font-size:14px;">**所有硬件部分使用伟大的立创EDA设计</span></span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*6、BOM清单</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><img src="//image.lceda.cn/pullimage/u2BkQbWV0IJBudlkeZGh503cTr3lUGdf3SH9Zy88.png" alt="" width="488" height="374"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><img src="//image.lceda.cn/pullimage/jqJZQesT1AUs3OWQaQ9f8BqbPGdACo5d2hMB2TO0.png" alt="" width="490" height="384"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;font-size:14px;">注:项目涉及的BOM清单。这个位置请上传BOM的截图。清单详情请以PDF的格式上传到附件中。建议包括型号、品牌、名称、封装、采购渠道、用途等内容。具体内容和形式应以表达清楚项目构成为准。</span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*7、大赛LOGO验证</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><img src="//image.lceda.cn/pullimage/eZPgHM8OgQ1A0RXBtftb4rGnJvXxxrRL9ZBuThXH.jpeg" alt="" width="1200" height="1200"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><img src="//image.lceda.cn/pullimage/rtqBR2ZHC5QcornGD2tJqgfxVDpquBxwYhaUVjhc.jpeg" alt="" width="1200" height="1200"></p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">* 8、演示您的项目并录制成视频上传</h3> <hr class="horizontal-splitline normal-bold-2"><p style="line-height:1.8;"> </p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;font-size:14px;">视频要求:请横屏拍摄,分辨率不低于1280×720,格式Mp4/Mov,单个视频大小限100M内;</span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;font-size:14px;">视频标题:立创电赛:{项目名称}-{视频模块名称};如立创电赛:《自动驾驶》-团队介绍。</span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="font-size:14px;">更多详情:<a href="/posts/06c94d90c2c447dfbd9ed7339ff4a5b1" target="_blank">https://diy.szlcsc.com/posts/06c94d90c2c447dfbd9ed7339ff4a5b1</a></span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> </div>

文档

Sheet_1

PCB

BOM

ID Name Designator Footprint Quantity Manufacturer Part Manufacturer Supplier Supplier Part
1 100u C1,C14,C19,C22 CAP-D6.3×F2.5 4
2 0.1u C2,C4,C11,C15,C18,C26 RAD-0.1 6
3 0.33u C3,C12 RAD-0.1 2
4 222 C5,C10 RAD-0.1 2
5 333 C6,C9 RAD-0.1 2
6 2u2 C7,C8 RAD-0.1 2
7 1u C13,C20 CAP-D4.0×F1.5 2
8 0.22u C16,C17 RAD-0.1 2
9 2200uf C23,C24 CAP-FLATMOUNT-13*26 2
10 GBJ2510 D1 DIO-BG-TH_PB 1
11 Black headphone jack J1 AUDIO-TH_PJ-3200 1
12 LED-0603_R LED1,LED2 LED0603_RED 2
13 PWR_IN P1 CONN-TH_3P-P5.00 1
14 L OUT P2 CONN-TH_2P-P5.00 1
15 R OUT P3 CONN-TH_2P-P5.00 1
16 1k R1,R6,R7,R16 R_AXIAL-0.3 4
17 20k R2,R15 R_AXIAL-0.3 2
18 10k R3,R10 R_AXIAL-0.3 2
19 1k5 R4,R9 R_AXIAL-0.3 2
20 4.7k R5,R8 R_AXIAL-0.3 2
21 5.6 R11,R13 R_AXIAL-0.3 2
22 33k R12,R14 R_AXIAL-0.3 2
23 20k R17 R0603 1
24 LM1875T U1,U3 TO-220-5_L10.5-W15.5-P1.70-TL 2
25 WH148-DUAL U2 WH148双联电位器 1
26 WH148 - DOUBLE RP1,RP2 WH148X2 2

附件

附件名 下载
VID_20210811_100042.mpeg4.aac.mp4

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杨静菡 回复
<p>这个散热片看的我好担心,品牌有源音箱或者功放机里的1875往往都是顶着比自身高很多倍的大铝板</p>
Lawrence Link 回复
<p>温度不低 但是散热产热可以平衡在70°附近 加大散热肯定有利</p>
杨静菡 回复
<p>我不信可以用接近或等于芯片手册里的最高电压去给板子通电,怕它炸了</p>
杨静菡 回复
<p>还有你那个变压器和电容也跟那散热一样,就跟闹着玩一样,生怕调大音量受不了</p>
aaaaa11111q11 回复
<p>像是反向放大电路</p>
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