<div class="document"> <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;">* 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;"> </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;">本次设计是基于LM1875功放芯片的双声道桌面功放。</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;"> </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;">项目首次公开；项目是原创；项目没有在别的比赛中获奖；没有在学校参加过答辩。</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;">* 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;"> </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;">本设计为GPL3.0开源协议</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;">*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;"> </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;">本功放的主体是两片LM1875芯片，该芯片性能优异，在正负25V供电8欧负载下可以达到25W的输出功率，可以满足于在小房间里面使用。电路方面参考了TI芯片手册的电路，设置了21倍的放大倍数，直接用手机作为音源也能得到合适的输出功率。反馈网络上用的是松下的0.1%精度电贴片电阻，可以缩小PCB面积和反馈网的布线长度以减少噪声的引入，同时也可提高左右声道的对称性。电源部分的整流桥上并了四个薄膜电容以用作消除二极管的噪声，主滤波电容是一对松下的4700UF的电解电容，再在主电容是并小的薄膜电容滤除高频噪声，同时也在每个芯片的供电引脚附近加入了退耦电容组，为功放提供一个良好的供电条件。功放的输出端加入了一个基于upc1237的保护电路，主要功能是消除开机时功放对喇叭的冲击和功放在故障输出直流电压时断开功放与喇叭之间的连接，以达到保护喇叭的目的。</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 pap-left-indent-1.6em" 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 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;">*5、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> <div class="table-box table-responsive table-expand"> <table class="table"><tr><th class="bom-chart" width="50">ID</th> <th class="bom-chart">Name</th> <th class="bom-chart">Designator</th> <th class="bom-chart">Footprint</th> <th class="bom-chart">Quantity</th> <th class="bom-chart">BOM_Manufacturer Part</th> <th class="bom-chart">BOM_Manufacturer</th> <th class="bom-chart">BOM_Supplier</th> <th class="bom-chart">BOM_Supplier Part</th> </tr><tr><td>1</td> <td>2.2uF</td> <td>C1,C30</td> <td>CAP-TH_BD8.0-P3.50-D0.6-FD</td> <td>2</td> <td> </td> <td> </td> <td> </td> <td> </td> </tr><tr><td>2</td> <td>47uF</td> <td>C2,C32</td> <td>CAP-TH_BD8.0-P3.50-D0.6-FD</td> <td>2</td> <td> </td> <td> </td> <td> </td> <td> </td> </tr><tr><td>3</td> <td>0.1uF</td> <td>C3,C4,C13,C31</td> <td>CAP-TH_L7.2-W2.5-P5.00-D0.6</td> <td>4</td> <td> </td> <td> </td> <td> </td> <td> </td> </tr><tr><td>4</td> <td>0.22uF</td> <td>C5,C11</td> <td>CAP-TH_L7.2-W6.0-P5.00-D0.5</td> <td>2</td> <td>PE224J2A0501</td> <td>KYET</td> <td>LCSC</td> <td>C393118</td> </tr><tr><td>5</td> <td>100uF</td> <td>C6,C7,C14,C29</td> <td>CAP-TH_BD8.0-P3.50-D0.6-FD</td> <td>4</td> <td>EEUFM1H101</td> <td>PANASONIC</td> <td>LCSC</td> <td>C128473</td> </tr><tr><td>6</td> <td>15pF</td> <td>C8,C9,C10,C12</td> <td>C0805</td> <td>4</td> <td>CC0805JRNPO9BN150</td> <td>YAGEO</td> <td>LCSC</td> <td>C107110</td> </tr><tr><td>7</td> <td>4700uF</td> <td>C15,C16</td> <td>CAP-TH_BD18.0-P7.50-D1.2-FD</td> <td>2</td> <td>ECA1VHG472</td> <td>PANASONIC</td> <td>LCSC</td> <td>C178403</td> </tr><tr><td>8</td> <td>100uF</td> <td>C17</td> <td>CAP-TH_BD6.3-P2.50-D1.0-FD</td> <td>1</td> <td>ERS1VM101E12OT</td> <td>AISHI</td> <td>LCSC</td> <td>C106694</td> </tr><tr><td>9</td> <td>223</td> <td>C18</td> <td>CAP-TH_L7.2-W2.5-P5.00-D0.6</td> <td>1</td> <td> </td> <td> </td> <td> </td> <td> </td> </tr><tr><td>10</td> <td>47uF</td> <td>C19,C20</td> <td>CAP-TH_BD5.0-P2.00-D0.8-FD</td> <td>2</td> <td>KM470M035C110A</td> <td>CapXon</td> <td>LCSC</td> <td>C74117</td> </tr><tr><td>11</td> <td>10uF</td> <td>C21</td> <td>CAP-TH_BD5.0-P2.00-D0.8-FD</td> <td>1</td> <td>10uF 25V 5*11</td> <td>ValuePro</td> <td>LCSC</td> <td>C43347</td> </tr><tr><td>12</td> <td>220uF</td> <td>C22</td> <td>CAP-TH_BD8.0-P3.50-D0.6-FD</td> <td>1</td> <td>ERE1VM221F12OT</td> <td>AISHI</td> <td>LCSC</td> <td>C106510</td> </tr><tr><td>13</td> <td>100nF</td> <td>C27,C28</td> <td>CAP-TH_L7.2-W2.5-P5.00-D0.6</td> <td>2</td> <td>C242A104J2SC000</td> <td>FARATRONIC</td> <td>LCSC</td> <td>C280716</td> </tr><tr><td>14</td> <td>10nF</td> <td>C33,C34,C35,C38,C39,C40</td> <td>CAP-TH_L7.2-W2.5-P5.00-D1.0</td> <td>6</td> <td> </td> <td> </td> <td> </td> <td> </td> </tr><tr><td>15</td> <td>GBU8K</td> <td>D1</td> <td>GBU_4P-L22.0-W3.5-P5.08</td> <td>1</td> <td> </td> <td> </td> <td> </td> <td> </td> </tr><tr><td>16</td> <td>1N4007_C727081</td> <td>D2,D6,D7</td> <td>SMA_L4.4-W2.8-LS5.4-RD</td> <td>3</td> <td>1N4007G-T</td> <td>Diodes Incorporated</td> <td>LCSC</td> <td>C516593</td> </tr><tr><td>17</td> <td>G2R-2-DC12V</td> <td>K1</td> <td>RELAY-TH_G2R-2-DCXX</td> <td>1</td> <td>G2R-2-DC12V</td> <td>Omron Electronics</td> <td>LCSC</td> <td>C48903</td> </tr><tr><td>18</td> <td>2A5G3HD01 LED</td> <td>LED1</td> <td>LED-SMD_L5.0-W2.7-FD</td> <td>1</td> <td>2A5G3HD01 LED</td> <td>KENTO</td> <td>LCSC</td> <td>C3649</td> </tr><tr><td>19</td> <td>1M</td> <td>R1,R7</td> <td>R0805</td> <td>2</td> <td>ERA6AEB105V</td> <td>PANASONIC</td> <td>LCSC</td> <td>C445668</td> </tr><tr><td>20</td> <td>22K</td> <td>R2,R10</td> <td>R0805</td> <td>2</td> <td>ERA6AEB223V</td> <td>PANASONIC</td> <td>LCSC</td> <td>C445659</td> </tr><tr><td>21</td> <td>1K</td> <td>R3,R15</td> <td>R0805</td> <td>2</td> <td>0603WAF1001T5E</td> <td>UniOhm</td> <td>LCSC</td> <td>C21190</td> </tr><tr><td>22</td> <td>20K</td> <td>R4,R6,R8,R9</td> <td>R0805</td> <td>4</td> <td>ERA6AEB203V</td> <td>PANASONIC</td> <td>LCSC</td> <td>C473304</td> </tr><tr><td>23</td> <td>1R/2W</td> <td>R5,R18</td> <td>RES-TH_BD5.0-L15.5-P19.50-D0.7</td> <td>2</td> <td>MFR02SF100KA10</td> <td>UniOhm</td> <td>LCSC</td> <td>C69885</td> </tr><tr><td>24</td> <td>56K</td> <td>R11,R14,R19</td> <td>R0805</td> <td>3</td> <td>PTFR0805B56K0N9</td> <td>ResistorToday</td> <td>LCSC</td> <td>C351560</td> </tr><tr><td>25</td> <td>10K</td> <td>R12</td> <td>R0805</td> <td>1</td> <td>AC0805DR-0710KL</td> <td>YAGEO</td> <td>LCSC</td> <td>C723677</td> </tr><tr><td>26</td> <td>3.9K</td> <td>R13</td> <td>R0805</td> <td>1</td> <td>RK73H2ATTD3901F</td> <td>KOA Speer Elec</td> <td>LCSC</td> <td>C317270</td> </tr><tr><td>27</td> <td>2K</td> <td>R16</td> <td>R0805</td> <td>1</td> <td>RMC08052K5%N</td> <td>Tyohm</td> <td>LCSC</td> <td>C269731</td> </tr><tr><td>28</td> <td>10R/2W</td> <td>R17</td> <td>RES-TH_BD4.5-L11.5-P15.50-D0.7</td> <td>1</td> <td>-</td> <td>Chian Chia Elec</td> <td>LCSC</td> <td>C119561</td> </tr><tr><td>29</td> <td>LM1875L-TB5-T</td> <td>U1,U2</td> <td>TO-220-5_L10.5-W15.5-P1.70-TL</td> <td>2</td> <td>LM1875T/NOPB</td> <td>TI</td> <td>LCSC</td> <td>C9666</td> </tr><tr><td>30</td> <td>UPC1237</td> <td>U3</td> <td>SIP-8_L19.2-W2.8-P2.54-L</td> <td>1</td> <td> </td> <td> </td> <td> </td> <td> </td> </tr><tr><td>31</td> <td>7812</td> <td>U4</td> <td>TO-220-3_L10.0-W4.5-P2.54-L</td> <td>1</td> <td>MC7812BTG</td> <td>ON</td> <td>LCSC</td> <td>C45387</td> </tr><tr><td>32</td> <td>DB128L-5.08-2P</td> <td>U5,U8,U9,U10</td> <td>CONN-TH_2P-P5.08_DB128L-5.08-2P</td> <td>4</td> <td>DB128L-5.08-2P</td> <td>DIBO</td> <td>LCSC</td> <td>C395868</td> </tr><tr><td>33</td> <td>DB128L-5.08-3P</td> <td>U6</td> <td>CONN-TH_DB128L-5.08-3P</td> <td>1</td> <td>DB128L-5.08-3P</td> <td>DIBO</td> <td>LCSC</td> <td>C395869</td> </tr></table></div> <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> <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;">* 6、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;"> </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>