本文采用buck-boost升降压电路设计，输入DC5-12v，经过buck-boost电路后，可输出DC0-18v可调的电压，可输出2A以上电流，采用PID算法自动调节输出设定的稳定电压，其输出稳压误差波动小于0.01v，纹波小于150mv，转换效率>87%，其中按键可任意设定输出的电压大小。

网站设计经典之作，2015年最新版英文原版（第6版） CONTENTS CHAPTER 1 Preface xxi HTML5 1 Creating Web Pages with HTML 2 HTML Syntax 3 Structure of a Basic Web Page 4 Activity: Building a Basic HTML5 Document 5 HTML in the Browser 11 Adding Style with CSS 13 CSS Syntax 15 Activity: Using Cascading Style Sheets 16 Organizing Information with Hypertext 19 Understanding the History of HTML 19 A Need for Standards 20 XML and XHTML: A New Direction 22 Problems with XHTML 23 A Proposal for HTML5 23 Working with HTML5 24 HTML5 Loose and Strict Syntaxes 26 Copyright 2015 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review has deemed that any suppressed content does not materially affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it.  v vi Contents CHAPTER 2 Choosing the Correct Syntax 27 Choosing the Correct Document Type and MIME Type 28 Creating Syntactically Correct Code 29 Element Categories 30 New Elements in HTML5 32 Attributes in HTML5 33 Obsolete Elements in HTML5 33 Using HTML5 Elements for Page Structure 33 Interactive Capabilities in HTML5 36 Using Good Coding Practices 37 Stick to the Standards 37 Use Semantic Markup 38 Validate Your Code 38 Chapter Summary 40 Key Terms 40 Review Questions 42 Hands-On Projects 42 Individual Case Project 44 Project Proposal 45 Team Case Project 45 Project Proposal 46 WEB SITE DESIGN PRINCIPLES 47 Understanding the Web Design Environment 48 Browser Compatibility Issues 48 Connection Speed Differences 50 Browser Cache and Download Time 51 Device and Operating System Issues 52 Copyright 2015 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBoo

SPRING技术内幕：深入解析SPRING架构与设计原理.pdf

是一个非常典型可靠的USB转串口电路。使用FT232RL