source for a .047uf electrolytic capacitor?
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source for a .047uf electrolytic capacitor?
i'm getting set to re-cap my ecoplate 1 but can't find anyone who carries a .047 microfarad electrolytic cap. i hoped it was a misprint, but i spoke to jim cunningham (who designed it) and that's what it was, alright. I've tried mouser, digi-key, allied and antique electronics supply to no avail. does anyone know where I might find one?
I can think of NO reason why ANY cap HAS to be polarized.
Aluminum electrolytics (and tantalums) are polarized because of their design and construction, which yields a part that is physically much smaller than a "film" capacitor with the same electrical specs (capacitance and oparating voltages). This becomes an issue with caps that are rated at dozens/hundreds/thousands of microFarads.
A 1000 uF, 50V "film" (ie, non electrolytic) cap would probably be the size of a microwave oven!! OTOH, you can easily fit several of the the same-valued caps, in an electrolytic version, in the palm of your hand.
The ONLY polarized caps I know of in sub-0.1 uF values would be a tantalum.
Bri
Aluminum electrolytics (and tantalums) are polarized because of their design and construction, which yields a part that is physically much smaller than a "film" capacitor with the same electrical specs (capacitance and oparating voltages). This becomes an issue with caps that are rated at dozens/hundreds/thousands of microFarads.
A 1000 uF, 50V "film" (ie, non electrolytic) cap would probably be the size of a microwave oven!! OTOH, you can easily fit several of the the same-valued caps, in an electrolytic version, in the palm of your hand.
The ONLY polarized caps I know of in sub-0.1 uF values would be a tantalum.
Bri
did you try www.angela.com ?
the smallest electrolytic caps I see are 0.33?F or 0.47?F... tens times more than the value you are looking for... When you get to values below 10?F there are good alternatives to electrolytics i,e, film caps of all sorts. You can get 50 volt or higher voltage-rated Polypropylene caps in 0.033?F from Digikey and others. Many vendors have a parametric search engine that will allow you to see what is available in what type...
I guess it should be said that if the original cap really is 0.033?F, or 33nF, it is almost certainly not an electrolytic cap of any sort, it's a film cap already, and as I recall Jim Cunningham did not use crap components so I see no really reason to change that cap at all unless it was damaged somehow
I guess it should be said that if the original cap really is 0.033?F, or 33nF, it is almost certainly not an electrolytic cap of any sort, it's a film cap already, and as I recall Jim Cunningham did not use crap components so I see no really reason to change that cap at all unless it was damaged somehow
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