https://stream.echo6.co/videos/watch/bed0d359-3c74-4019-b061-463b9f957f92 Mailbag Monday Spoilers: Dual input power selector circuit, the Pow-OR: https://github.com/MouseBiteFever Casio FX-7000G the world's first graphing scientific calculator, circa 1985. A 1989 vintage analog ohmeter. Teardown of a Clipsal 32E450UDM 450W electronic dimming module. http://www.clipsal.com/Trade/Products/ProductDetail?catno=32E450UDM www.infineon.com/dgdl/SPP_I_A20N60C3_Rev.3.0.pdf Forum: http://www.eevblog.com/forum/blog/eevblog-643-mailbag/ EEVblog Main Web Site: http://www.eevblog.com EEVblog Amazon Store: http://astore.amazon.com/eevblogstore-20 Donations: http://www.eevblog.com/donations/ Projects: http://www.eevblog.com/projects/ Electronics Info Wiki: http://www.eevblog.com/wiki/ Wed, 10 Jun 2026 03:13:07 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/bed0d359-3c74-4019-b061-463b9f957f92 All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.