User talk:121.54.64.38

February 2011
We welcome and appreciate your contributions, but your recent edits to Semiconductor Electronics/Diode/Construction and Operation had to be undone. Please see What is Wikibooks? to learn more about what contributions are beneficial to Wikibooks. It might not have been your intention, but your recent edit removed content from Wikibooks. When removing text, please specify a reason in the edit summary and discuss edits that are likely to be controversial on the page's talk page. If this was a mistake, don't worry; the text has been restored, as you can see from the page history. Take a look at the welcome page to learn more about contributing to this project, and if you would like to experiment, please use the sandbox. Thank you. – Adrignola discuss 05:14, 13 February 2011 (UTC)