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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: resistor decoder
Date: Sat, 07 Sep 2002 00:56:54 GMT
NNTP-Posting-Date: Fri, 06 Sep 2002 17:56:54 PDT
Ben Bradley wrote:
> In sci.electronics.design, Oliver Dain
> >I've just released GUI application I wrote that converts resistor color
> >codes to values and vice-versa (the code is GPL'd). Granted you don't need
> >an application to do this for you, but sometimes its handy. The
> >application will run on Linux and Windows (should run on other Unixes and
> >Mac OS X too but I haven't tested that). If you happen to have your
> >"workshop" right next to your computer, like me, you may find this useful.
> >If you're interested its available at: http://resistor.sourceforge.net/
> I started on my way to learning the resistor color code when I
> assembled my first Heathkit that I got on my birthday at age 8. That
> would have been 1965. Ever since college I can read most resistors as
> if the numbers were printed right on them. I can never remember which
> multiplier is which for under 10 ohms, though.
> I noticed digikey has SMT resistors priced less than leaded, and a
> larger selection of SMT as well. Now that I've known the resistor
> color code for decades (still useful for some things such as the wire
> numbers of color-coded ribbon cable, logic analyzer probes and such),
> everything is surface mount with a number laser-etched on it that I
> need a magnifying glass to see. I need a digital camera that will read
> those for me, as well as giving the part number so I can
> cross-reference each flea, er, component to a schematic and an 8x
> printout of the PCB layout.
Surface mount resistors in 1206 size I don't mind. I'm extremely myopic
so I take off my glasses and get my nose in close to read them. I can
change one in ten minutes time. I can read the blue 803's that way but
have trouble with black ones. I can't change these and send the board
out to the contractor who has a young son who can change them.
Capacitors are a major problem. The board contractor stuffed 10 boards
and all of them had a non-functional circuit on them that had worked in
the previous revision. Seems he stuffed 10pf caps for 10nf caps in that
circuit. I couldn't tell it by inspection. I had to change the caps on
one board to be sure that was the problem.
Because of time wasted on screwups entirely due to surface mount parts,
I have our contractor do through hole for boards that we use in the lab
but will not go to a prospective customer for our actual parts. The time
wasted messing with surface mount parts is horrendous and is hardly
worth it except as eyewash (and that's how we use them).
TGIF and it is o'beer 30 by my clock and I won't have to look at the
blasted new rev board I'm debugging until Monday. It is surface mount,
10 inches by 12 inches and dosen't work but we have authorized a new
revision gated by me finding all the gotchas in this one. Ugh!
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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