Digest for sci.electronics.repair@googlegroups.com - 10 updates in 2 topics

Ralph Mowery <rmowery28146@earthlink.net>: May 04 01:11PM -0400

In article <qak9jv$e3r$1@dont-email.me>, Cybnorm@spam_me_not.Hotmail.Com
says...
> (out of production for years, none available)
> And the data sheet for the prospective new little one:
> https://www.farnell.com/datasheets/2755239.pdf
 
I do not see any reasonthat it would not work. It is a motor run
capacitor. The uF is the same and the voltage rating is as high or
higher (much higher in this case). While not really important in your
cse, the temperature rating is 85 deg C. It would be better if it was
over 100 deg C. That just usually indicates a bette capacitor, but not
really needed in your case.
Jeff Liebermann <jeffl@cruzio.com>: May 04 11:17AM -0700

On Sat, 4 May 2019 15:03:27 -0000 (UTC), "Dallas"
>(out of production for years, none available)
>And the data sheet for the prospective new little one:
>https://www.farnell.com/datasheets/2755239.pdf
 
It looks ok, with one possible problem. The capacitor should be
non-polarized.
<https://en.wikipedia.org/wiki/Motor_capacitor>
Start capacitors above 20 µF are always non-polarized
aluminium electrolytic capacitors [4] with non solid
electrolyte and therefore they are only applicable for
the short motor starting time.
I dunno about the "non solid electrolyte" since the capacitor in
question is a "solid" polypropylene metallized film dielectric. Oh
well.
 
I can't tell from the Farnell data sheet whether it's an NP cap.
So, I found the original C87 series data sheet at:
<https://content.kemet.com/datasheets/KEM_F3063_C87.pdf>
It doesn't specifically say non-polarized, but the lack of polarity
markings and an "AC" voltage rating, indicates that it's probably NP.
Yes, it should work.
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
amdx <nojunk@knology.net>: May 04 03:05PM -0500

On 5/4/2019 1:17 PM, Jeff Liebermann wrote:
> It doesn't specifically say non-polarized, but the lack of polarity
> markings and an "AC" voltage rating, indicates that it's probably NP.
> Yes, it should work.
 
I'd like to pass some of your help ethic on to Phil.
But I'm afraid it would take a massive dose, and end up harming
your superpower!
Luv you Jeff, Mikek :-)
Ralph Mowery <rmowery28146@earthlink.net>: May 04 04:54PM -0400

In article <ftkrcepgj5vq9l3q9c5s95afdm91arafj6@4ax.com>,
jeffl@cruzio.com says...
> I dunno about the "non solid electrolyte" since the capacitor in
> question is a "solid" polypropylene metallized film dielectric. Oh
> well
 
The capacitor in question was listed as a motor RUN capacitor,not start.
 
The top of the data sheet says RUN so the non-polarized electrolyte
part should not be in question.
"Dallas" <Cybnorm@spam_me_not.Hotmail.Com>: May 04 09:17PM

Dallas wrote:
 
Yeah... I love this group. It's been years since I've been here and
I'm super happy that it's still going and not wrecked by trolls.
 
Thanks guys!
 
 
 
 
--
Dallas
John Robertson <spam@flippers.com>: May 04 02:39PM -0700

On 2019/05/04 8:03 a.m., Dallas wrote:
> (out of production for years, none available)
> And the data sheet for the prospective new little one:
> https://www.farnell.com/datasheets/2755239.pdf
 
Do you have any photos of your rollup door? I'm wondering if it is the
same make as my old 1970s vintage door on my midway rifle gallery game.
 
I've put a few pictures of my door motor here:
 
https://www.dropbox.com/sh/o74oeoers7uky55/AAB7Z8tLqrGbltXAthIOVXXia?dl=0
 
John :-#)#
Jeff Liebermann <jeffl@cruzio.com>: May 04 02:59PM -0700

On Sat, 4 May 2019 16:54:36 -0400, Ralph Mowery
 
>The capacitor in question was listed as a motor RUN capacitor,not start.
 
>The top of the data sheet says RUN so the non-polarized electrolyte
>part should not be in question.
 
Oops. I stand corrected. I wasn't paying attention to the
differences between start and run capacitors.
 
Run vs. Starting Capacitor
<http://www.capacitorformotor.com/starting_capacitor.html>
<http://www.capacitorindustries.com/wp-content/uploads/Run-and-Start-Capacitors.pdf>
 
In any case, the data sheet is the correct one for a run capacitor:
<https://content.kemet.com/datasheets/KEM_F3063_C87.pdf>
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
"Dallas" <Cybnorm@spam_me_not.Hotmail.Com>: May 05 04:30PM

John Robertson wrote:
 
> AAB7Z8tLqrGbltXAthIOVXXia
 
 
Yup, nearly identical. Same gears for the limit switches. (pain in
the ass :- )
 
 
--
Dallas
"Dallas" <Cybnorm@spam_me_not.Hotmail.Com>: May 05 04:30PM

John Robertson wrote:
 
 
--
Dallas
Chris Jones <lugnut808@spam.yahoo.com>: May 05 09:27PM +1000

On 05/05/2019 01:00, Fox's Mercantile wrote:
> "you learn something new, everyday" when I learned they used
> aluminum for lenses.
> Unless you work with this stuff, it just doesn't occur to you.
 
I'd never heard of any refractive optics for x-rays. I did read
something about mirrors for x-ray telescopes, but they were supposedly
very inefficient and only worked at glancing? grazing? angles. And of
course diffraction gratings can be made from crystals, and sometimes
they bend a crystal to focus a certain wavelength on a spot. Apart from
that I thought it was all basically just casting shadows.
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