Mailbag Monday<br /><br />Spoilers:<br />Dual input power selector circuit, the Pow-OR:<br />https://github.com/MouseBiteFever<br />Casio FX-7000G the world's first graphing scientific calculator, circa 1985.<br />A 1989 vintage analog ohmeter.<br />Teardown of a Clipsal 32E450UDM 450W electronic dimming module.<br />http://www.clipsal.com/Trade/Products/ProductDetail?catno=32E450UDM<br />www.infineon.com/dgdl/SPP_I_A20N60C3_Rev.3.0.pdf<br /><br />Forum: http://www.eevblog.com/forum/blog/eevblog-643-mailbag/<br /><br />EEVblog Main Web Site:<br />http://www.eevblog.com<br />EEVblog Amazon Store:<br />http://astore.amazon.com/eevblogstore-20<br />Donations:<br />http://www.eevblog.com/donations/<br />Projects:<br />http://www.eevblog.com/projects/<br />Electronics Info Wiki:<br />http://www.eevblog.com/wiki/
