My book Electronics Project will be free on Kindle from the 2d to the 4th of Jan 2014.
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Ddigital-text&field-keywords=%22znidarsic+science+books%22&rh=n%3A133140011%2Ck%3A%22znidarsic+science+books%22 enjoy Frank Znidarsic
