Em 12/3/2012 11:36, Justin Richards escreveu:
> Hi Folks,
>
> decided to replace all the Electrolytics on a monitor board (Orion
> PWB-2022 like http://www.jomac.net.au/Orion%20PWB%202012-PWB2022.jpg)
> found in an old arcade machine because a 680uF 200WV (note WV not V)
> capacitor was bulging badly.
>
> The replacement I acquired (with some effort)  has markings of 680uF
> 200V and is about 2/3 the physical size.
>
> Questions:
>
> 1. Is 200V =3D 200WV.  Googling appears to indicate they are the same,
> that is [V]oltage  =3D [W]orking [V]oltage but the physical size
> difference has me concerned.
>
>  2. I assume ceramics, greencaps and caps that look like a
> Polypropylene Film Capacitor eg
> http://www.1st-product.com/products/170/Polypropylene-Film-Capacitor-8966=
3.html
> dont need to be replaced.   They never seem to appear in any cap kit
> lists for these types of boards so figure it is just the
> electrolytics.
>
> Is this the general consensus.
>
> Justin


Manufacturers make electrolytics in more than one size for each
capacitance and voltage. Smaller ones are usually more expensive and
targeted to space constrained applications.
Temperature range also affects the size.

Another reason for the new ones being smaller may be that they use a
newer technology, allowing the same capacitance in a smaller body.


Isaac

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