A good book to show some of the electronic basics is the Amateur radio book ARRL - check out at your local library or amateur radio club. Or search the net. Search fro Electronic Tutorial etc. Try this web address http://www.ee.uts.edu.au/~venkat/pe_html/contents.htm ************************************************* Roy Hopkins rdhopkins@ihug.co.nz ************************************************* --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.560 / Virus Database: 352 - Release Date: 8/01/2004 -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics