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The unit also traces PCB development across key decades, from early point-to-point construction to double-sided, multilayer, surface-mount, and advanced formats, concluding with an introduction to different PCB types.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/technology/","Technology",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/unit-iv-design-of-pcb/664016/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/unit-iv-design-of-pcb/664016.png","ImageObject",300,407,{"name":42,"@type":43},"Himbo","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-30","2026-10-29",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",5,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What is a Printed Circuit Board (PCB) and what does it do in electronic devices?","Question",{"text":63,"@type":64},"A PCB is an electronic circuit used to provide mechanical support and a pathway for electronic components. It enables components to connect without visible wires.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What are the main ways components are electrically connected to PCB circuits?",{"text":68,"@type":64},"Common connection methods include hole technology and surface mount. In hole technology, leads are inserted through holes and soldered to circuit connections on the reverse side.",{"name":70,"@type":61,"acceptedAnswer":71},"What major milestones are mentioned in the history of PCB development?",{"text":72,"@type":64},"The content highlights early materials in the 1920s, first double-sided PCBs in 1947, multilayer PCB production starting in 1960, the shift to surface mount in the 1980s, and later advancements such as RS-274X and ODB ++ formats in the 1990s.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},664016,1793236418,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,100,104,109,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":97,"show_sort_weight":98,"slug":99},"Comic",60,"comic",{"id":101,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":102,"slug":103},6,50,"technology",{"id":105,"doc_module":4,"doc_module_name":25,"category_name":106,"show_sort_weight":107,"slug":108},7,"Healthcare",40,"healthcare",{"id":110,"doc_module":4,"doc_module_name":25,"category_name":111,"show_sort_weight":112,"slug":113},8,"Research & Report",30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":55,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":101,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":102,"language":139,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":12,"update_tm":80,"read_time":143},687197100911,"https://ap-avatar.wpscdn.com/avatar/a000239b6f1da00475?x-image-process=image/resize,m_fixed,w_180,h_180&k=1785132997149421697","UNIT-IV DESIGN OF PCB  \nPrinted Circuit Board (PCB)  \nDefinition-What does Printed Circuit Board (PCB) mean?  \nA printed circuit board (PCB) is an electronic circuit used in devices to provide mechanical support and a pathway to its electronic components. PCB is also known as printed wiring board (PWB) or etched wiring board (EWB) .  \nThe circuits are produced by a slight layer of conducting material deposited on the outside of an insulating board called as the substrate.Separate components are located on the surface of the substrate & soldered to the connected circuits.  \nA PCB can hold various electronic components that may be soldered without using visible wires, which facilitates its use.  \nPCBs are found in nearly every electronic and computing device, including motherboards, network cards and graphics cards to internal circuitry found in hard/CD-ROM drives.  \nThe construction of the PCB can be done in three ways, namely single sided, double sided and multi layered.The components on a PCB are connected electrically to the circuits by two different methods such as hole technology and surface mount. In hole technology, every component consists of thin leads, which are pressed through tiny holes in the substrate & soldered to connection boards in the circuits on the reverse side. A solder paste includes a glue, solder and flux are applied at the contact point to grip the components in position until the solder is liquefied.  \nHistory of PCB  \nBefore printed circuits became the common component used in electronics, point to point construction was used. This meant some extremely bulky and unreliable designs that required large sockets and regular replacement. Most of these issues were directly addressed when PCBs went into regular production.  \n1920s – The early PCB material could be almost anything, from Bakelite and Masonite to plain old thin pieces of wood. Holes could be drilled into the material and flat brass wires would be riveted onto it. It may not have been pretty, but the concept was there, and it worked. It was often used in radios and gramophones at the time.  \n1947 – First double sided PCB’s with plated through holes produced.  \n1950s – 60s – The types of materials used for the board was shifting to different resins and other materials, but they could still only be printed on a single side. The wiring would be printed on one side and the electrical components would be on the other. Still, it was a much more efficient option than bulky wiring, so it was starting to see a wider adoption.  \nOne of the biggest steps forward came in 1956 when the U.S. Patent Office granted a patent to a small group of scientists representing the U.S. Army for the “Process of Assembling Electrical Circuits.” At the time, the process involved drawing the wiring pattern and then photographing it onto a zinc plate. This plate could then be used to create a printing plate for an offset printing press. This is what was used to print the wire in acid resistant ink on the copper foil, which could then be etched by an acid solution.  \n1957 – IPC (The Institute of Printed Circuits) formed and hold first meeting in Chicago IL.  \n1960 – Multilayer (4+ layer count) PCB’s begin production.  \n1960s -70’s – Boards were designed using 4:1, red-and-blue line vellum method for hand-taping components and tracks. A precision camera then produced the 1:1 negative manufacturing film. An experienced designer could layout and tape a board at the rate of about two hours for each equivalent 14-pin IC on the board.  \n1970s – The circuitry and overall size of the boards were starting to get a lot smaller by the 70s, and hot air soldering methods began to be used. This is also when the Japanese developers began to create screen processes that used various aqueous developed LPIs (liquid photo imageable masks) . This became the industry standard over the years.  \nGerber Scientific introduces RS-274-D as a machine-based format for vector photo plotters.  \n1980s – Sur","cbCaiq4Ex7D7lomt","https://ap.wps.com/l/cbCaiq4Ex7D7lomt","pdf",3206012,"English","# Printed Circuit Board (PCB)\n## Definition\n## History of PCB\n## Different Types of Printed Circuit Boards","[{\"question\":\"What is a Printed Circuit Board (PCB) and what does it do in electronic devices?\",\"answer\":\"A PCB is an electronic circuit used to provide mechanical support and a pathway for electronic components. It enables components to connect without visible wires.\"},{\"question\":\"What are the main ways components are electrically connected to PCB circuits?\",\"answer\":\"Common connection methods include hole technology and surface mount. In hole technology, leads are inserted through holes and soldered to circuit connections on the reverse side.\"},{\"question\":\"What major milestones are mentioned in the history of PCB development?\",\"answer\":\"The content highlights early materials in the 1920s, first double-sided PCBs in 1947, multilayer PCB production starting in 1960, the shift to surface mount in the 1980s, and later advancements such as RS-274X and ODB ++ formats in the 1990s.\"}]","UNIT-IV DESIGN OF PCB | PDF",126]