Talk:Types of capacitor/archive

ARCHIVE#1
PLEASE DO NOT EDIT TTHIS PAGE ITS aN ARCHIVE

Page naming discussion
copied from end of page.

''"Real" capacitors? As opposed to what?? This article needs to be split up. Some of the material belongs in the capacitor article, and the rest belongs in articles about individual types, like electrolytic capacitor and tantalum capacitor and the like. — Omegatron 14:55, 22 November 2005 (UTC) ''


 * Real capacitors as you might use in equipment as opposed to theoretical capacitors that you use in simulators.
 * If we follow your suggestions 'O', how many different artiticles would you envisage to deal with all the different types of capacitor? I think the article's fine as it is. Lets leave it for now--Light current 23:06, 22 November 2005 (UTC)


 * Is the term 'Practical capacitor' in common usage somewhere? It is not in North America. If not then I question the validity of the term as the title of this article. DV8 2XL 12:38, 3 December 2005 (UTC)
 * Copied from earlier posts:

''What does 'practical' indicate? The capacitor page describes what a capacitor is but this page does not explain practical. 00:52, 19 November 2005 (UTC)—preceding unsigned comment by 12.210.214.118 (talk • contribs)

''Its pretty obvious is it not??? Its about real capacitors. Do you have another name for them??--Light current 01:15, 19 November 2005 (UTC)''
 * You could call them real capacitors, non-theoretical capacitors, actual capacitors, physical capacictors, or practical capacitors. Choose one of the above.

--88.110.132.43 13:07, 3 December 2005 (UTC)
 * Yes but broadly, within the general thrust of an encyclopedia to provide access to knowledge, is someone going to look-up any of these terms? I suspect that the term most would use is simply 'capacitor'.DV8 2XL 13:21, 3 December 2005 (UTC)


 * We already have a page called capacitor (dealing with it as a circuit element) which was getting too big- hence the earlier split. I believe the is a 'see also' on the capacitor page if people want to learn about practical capacitors. Searching for capacitor will take you to the a page about the capacitor circuit (theoretical) concept. I see no problem with how its arranged at the moment - but feel free to suggest alternatives.--Light current 13:25, 3 December 2005 (UTC)


 * Yes I an a firm believer in splitting up overly long articles. Keeping with general Wikipedia president then this article should be renamed 'Capacitor (component)' I would think. DV8 2XL 13:35, 3 December 2005 (UTC)

Yes I can agree with that. Please feel free to change it. Dont forget disamb on the capacitor page tho!;-)--Light current 13:38, 3 December 2005 (UTC)
 * Done and done. DV8 2XL 13:57, 3 December 2005 (UTC)

Molded mica caps
What do molded mica caps look like?--Light current 23:14, 14 October 2005 (UTC)
 * I'll try to get the pics. Can any body tell me what happens to the voltage rating when capacitors are in series or in parallel? --Davy Jones 02:43, 23 October 2005 (UTC)

Same voltage rating in parallel. Equal to the smallest rating when in series (assuming the voltage is shared equally by all capacitors -- this means all the same capacitance value). In series, usually high value resistors are put across each cap to ensure voltage sharing.--Light current 05:02, 23 October 2005 (UTC)

Apps
Should apps be on this page or the capacitor page. THoughts?--Light current 13:41, 15 October 2005 (UTC)
 * applications will look better and easier on the capacitor page. --Electron Kid 07:32, 30 October 2005 (UTC)

Motors as capacitors
Just a thought. A new heading like ' Unusual capacitors' could be put at bottom of page and small amount of stuff or link put in about motors under certain conditions acting like caps. A link could be added then to Power factor correction page. Other forms of unusual capacitors could also be added.--Light current 17:25, 23 October 2005 (UTC)
 * what bout givin a link to synchronous motor in the practical capacitors? It will save repetition. I will add information about the 3φ Synchronous motors in that page itself. --Electron Kid 07:21, 30 October 2005 (UTC)
 * by the way, what are those tags for? The page does not contain much about Electrolytic capacitor. But the reverse must be done. --Electron Kid 07:46, 30 October 2005 (UTC)

EDLCs
Should EDLCs be put under the electrolytic capacitor heading or not. comments welcomed.--Light current 22:24, 1 November 2005 (UTC)

REDirect
electrolytic capacitor now redirected here as announced.--Light current 02:28, 9 November 2005 (UTC)


 * Where was this announced? Who agreed with the move? — Omegatron 03:34, 19 November 2005 (UTC)

Merge announced on WikiProject Electronics (Task list) 3 weeks ago. No objections--Light current 13:33, 19 November 2005 (UTC)


 * Did anyone agree? I don't see any discussion. — Omegatron 14:55, 22 November 2005 (UTC)

And notified under task progress statements: Copied electrolytic capacitor stuff here ready for completion of merge if noone objects.--Light current 23:08, 1 November 2005 (UTC)

If you think this needs splitting off into a separate article, why not put a note stating reasons under the task list heading (Merging /splitting suggestions) on WikiProject Electronics to see if anyone agrees or objects?--Light current 16:19, 19 November 2005 (UTC)

Copied Matl on Electrolytics
Many conditions determine a capacitor's value, such as the thickness of the dielectric and the plate area. In the manufacturing process, electrolytic capacitors are made to conform to a set of standardized values, which are based on a set of base numbers. By multiplying these base numbers by a power of ten, any practical capacitor value can be achieved, which is suitable for most applications.

It should also be noted that virtually any storage capacity for a capacitor can be achieved and manufactured. Many electronics companies specialize in the manufacturing of precision components, designed with a specific task in mind. However, the usage of standardized capacitors is far more abundant.

The concept of base numbers
Base multiplier numbers were selected to take into account the consideration of the tolerance value of the capacitor. The base numbers were chosen as such (similar to those of resistors, but with far fewer numbers) in order to space out the values accordingly with increasing distance between them to avoid unnessary overlapping of tolerance-considered values. When electronics was fairly new, and components were often made to fit a specific need, the storage capabilities of early capacitors were of more arbitrary, and somewhat simpler, base numbers. The more common values included 1.0, 1.5, 2.0, 3.0, 5.0, 6.0, and 8.0 as base numbers, but they were not necessarily limited to these values. Once again, values were generally in microfarads (µF) and could be multiplied by any power of ten to achieve values such as 8, 10, 15, 20, 30, 50, 100, and so forth.

In around 1970, a standardized set of capacitor base numbers was devised so that the value of any modern electrolytic capacitor could be derived from multiplying one of the modern conventional base numbers 1.0, 2.2, 3.3, or 4.7, by a power of ten. Therefore, it is common to find capacitors with values of 10, 22, 33, 47, 100, 220, and so on. Using this method, values ranging from 0.1 to 4700 are common in most applications. Values are generally in microfarads (µF).

How standardized values help
Most electrolytic capacitors have a tolerance range of 20 per cent, meaning that the manufacturer guarantees that the actual value of the capacitor lies within 20 per cent of its labeled value.

A 10µF capacitor, for example, may in actuality be as low as 8µF whereas a capacitor marked 8µF may in fact be as high as 9.6µF. This causes an overlap of 1.6µF. The standardized base values help this by alleviating overlaps due to tolerance, illustrated by the following table:




 * The left numbers are the base values.
 * The center numbers are the differences based on ± 20 per cent tolerance.
 * The numbers on the right illustrate the range of actual values by applying the tolerance.

In an effort to cut costs in the manufacturing process, the number of possible values was limited, because having overlapping values would be viewed as unneeded and redundant, since for most practical applications, having a 20 per cent (or even higher) tolerance did not adversely affect the functionality of the device. The reduction of variations in the product allowed companies to produce greater quantities of existing samples. This in turn, allowed for lower cost components.

practical capacitors???
why was this moved from electrolytic capacitor?? — Omegatron 06:22, 11 November 2005 (UTC)


 * Why was what moved?--Light current 07:22, 11 November 2005 (UTC)

What does 'practical' indicate? The capacitor page describes what a capacitor is but this page does not explain practical. 00:52, 19 November 2005 (UTC) &mdash;The preceding unsigned comment was added by 12.210.214.118 (talk &bull; contribs).


 * Its pretty obvious is it not??? Its about real capacitors. Do you have another name for them??--Light current 01:15, 19 November 2005 (UTC)
 * "Real" capacitors? As opposed to what??  This article needs to be split up. Some of the material belongs in the capacitor article, and the rest belongs in articles about individual types, like electrolytic capacitor and tantalum capacitor and the like. — Omegatron 14:55, 22 November 2005 (UTC)