EEVblog #643 - Mailbag

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

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