Re: Lesson R,L,C,T,V,D but Q and U ?
And I (probably incorrectly) thought that 'U' meant 'Unit' (as in a circuit made as a single unit). DEC used 'E' for IC's on their diagrams and PCBs, I do not know what it stood for.
I've seen signal diodes labelled 'CR' (Crystal Rectifier I guess) and power diodes 'MR' (Metal Rectifier), even when they were silicon junction types.
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