- Will this capacitor work? - 9 Updates
- Marantz Model 19 Scope - 1 Update
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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