On Saturday 30 November 2024 03:51:56 pm Roy J. Tellason, Sr. via groups.io wrote:
I have some radio shack packages with "IR emitter-detector pair" in them, ?and an assortment of phototransistors pulled from scrapping VCRS (there's at least two in every VHS machine) and some other parts salvaged from floppy drives, ?where they are used for write protect and index hole sensing. ?I haven't found any particular use for these parts, ?maybe I just haven't found the right inspiration yet...
Oh yeah, and optoisolators and optointerrupters. I have a whole tube of NOS 4N26, I think, plus piles of salvaged other numbers I did find a use for an optointerrupter. I was given a sewing machine motor, plugged it in and spitzensparken! So I disassembled it and replaced the cord. Then with it spinning I wondered how fast that thing was going. So I rigged up an optointerrupter on a bit of perfboard, put a bit of tape on the motor shaft, and coupled the output to my scope. It was a surprisingly high number as I recall, though of course there was no load on the motor...
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Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
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Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
