Tham khảo tài liệu 'hacking roomba - tod part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 402 Appendix A Soldering and Safety Basics Figure A-22 shows a standard anti-static bag used as a holder for an expensive part. These bags are made of metalized plastic and are meant to keep all pins of a part at the same voltage potential. What s dangerous about static electricity is that it can put a several-thousand-volt spike between two pins on a part. The current is very low but the delicate internals of an IC cannot withstand such a high voltage. Figure A-23 shows ICs pushed into anti-static foam which serves a similar purpose of keeping all the parts at the same voltage level. Figure A-22 Anti-static bag with sensitive component on top If you solder directly to ICs which is not recommended unless you have to make sure you use a grounded soldering iron. All the better soldering irons like the Weller ones are grounded. If you live in a humid climate static prevention issues become less of an issue but if you live in the desert take extra care. Once you get into the habit of not shifting too much in your chair and occasionally touching the grounded chassis of your computer or work light you don t have to consciously worry about static issues. Appendix A Soldering and Safety Basics 403 Figure A-23 Anti-static foam Summary Soldering is fun. On the one hand you get to play with molten metal and a dangerous device that can burn holes in things. On the other hand you get to construct a working circuit using your bare hands. You can now build all of the circuits in this book and 90 percent of the circuits out there. The main difference with the more advanced circuits is the smaller .
