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- 15:53, 10 July 2009 Alexanderpf talk contribs uploaded File:Full Wave Rectifier.png (A full wave rectification circuit converts an AC input current into a DC current.)
- 15:46, 10 July 2009 Alexanderpf talk contribs uploaded File:Half Wave Rectifier.png (A half wave rectification circuit allows either the positive or negative half of an AC wave to pass, thereby creating a DC current.)
- 08:11, 12 November 2008 User account Alexanderpf talk contribs was created