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These projects are fun to build and fun to use Make lights dance to music, play with radio remote control, or build your own metal detector Who says the Science Fair has to end? If you love building gadgets, this book belongs on your radar. Here are complete directions for building ten cool creations that involve light, sound, or vibrations -- a weird microphone, remote control gizmos, talking toys, and more, with full parts and tools lists, safety guidelines, and wiring schematics. Check out ten cool electronics projects, including * Chapter 8 -- Surfing the Radio Waves (how to make your own radio) * Chapter 9 -- Scary Pumpkins (crazy Halloween decorations that have sound, light, and movement) * Chapter 12 -- Hitting Paydirt with an Electronic Metal Detector (a project that can pay for itself) Discover how to * Handle electronic components safely * Read a circuit diagram * Troubleshoot circuits with a multimeter * Build light-activated gadgets * Set up a motion detector * Transform electromagnetic waves into sound Companion Web site * Go to www.dummies.com/go/electronicsprojectsfd * Explore new projects with other electronics hobbyists * Find additional information and project opportunities
Your how-to guide to become a ham Ham radio, or amateur radio, is a way to talk with people around the world in real-time, or to send email without any sort of internet connection. It provides a way to keep in touch with friends and family, whether they are across town or across the country. It is also a very important emergency communication system. When cell phones, landlines, the internet, and other systems are down or overloaded, Amateur Radio still gets the message through. Radio amateurs, often called "hams," enjoy radio technology as a hobby, but are often called upon to provide vital service when regular communications systems fail. Ham Radio For Dummies is your guide to everything there is to know about ham radio. Plus, this updated edition provides new and additional information on digital mode operating, as well as use of amateur radio in student science and new operating events. • Set up your radio station • Design your ham shack • Provide support in emergencies and communicate with other hams • Study for the licensing exam and choose your call sign If you're looking to join a college radio club or just want to learn the latest tips and tricks, this book is a helpful reference guide to beginners, or those who have been "hams" for years.
本书让您轻易习得科研英文写作技巧，以撰写出优质的英文研究论文、投稿信、论文评论、提案或报告。本书涵括各领域研究论文写作章节，投稿信 (Cover Letter) 及论文评论 (Paper Critique) 的写法、格式、用辞措字及词句范例，以提供全方位的演练，帮助研究者和研究生迅速即可起笔写作。 本书可以单独使用；亦可与QRP自学实作软件搭配使用，学员可随时启动云端自动批改系统，写作或重写内容即可快速被批改，享受互动的体验，亦可依据已批改过文章所显示的错误和评语，做中学，学中做，修正错误并补强文意，提升学习效能。