Color Codes
Color-coding of cabling, road cases, speakers, etc. is one of those “how do you know that?” questions I get all the time. In all honesty, I have to blame my eighth grade industrial arts teacher (in electronics shop) for the lifelong passion into all my esoteric electronics knowledge. But, of course, it was 1974, and my first project was a one-tube AM radio. I remember a lot of both the good and bad habits of electronics from that class; bad things like how to toss molten solder from the iron-tip toward other classmates, and good things like the color code.
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