CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] Re: emc success

Posted by Jeff Barlow
on 2000-11-20 17:53:18 UTC
Wally,

I'm deeply offended, I poorly designed that stuff myself. :)

Yes, I used to make a living designing hardware. After the third or
forth tantalum pops in the prototype we tend to switch to a regular old
Al foil electrolytic for the production boards.

Tantalum caps are almost too good. All real world caps are RCL networks.
Tantalums give you more C and less RL. This should be a good thing.
Alas, it's that "bad" RL stuff that keeps the electrolytics from
exploding.

Tantalums will charge and discharge fast enough to destroy themselves.
You can current limit them so they won't, but usually it's cheaper and
faster to use a foil electrolytic and a few ceramics for power filter
and bypass applications. Tantalums have their place, but they take more
design effort than bypass caps normally get.

Jeff

On Tue, 21 Nov 2000 01:14:57 -0000, Wally wrote:

>Hi Jeff, it sounds like something was poorly designed if it blew up
>like that. Tantalum caps are used in almost every electronic
>consumer and industrial product you can think of. And out of those
>billions of products how many blow up. As i said before in 25 years
>i have never seen one, but i have seen many electrolitics blow up.
>
>Wally K.
>
>--- In CAD_CAM_EDM_DRO@egroups.com, Jeff Barlow <jeff@b...> wrote:
>> Wally,
>>
>> Pardon me for butting in here, but.... In my experience the main
>problem
>> (if any) with tantalums is that they are simply far less tolerant of
>> abuse than other capacitors. Also, when they do fail, they make a
>louder
>> noise. It's easy to find the dead one, though. You just look for
>the two
>> leads where the cap used to be.
>>
>> Jeff
>>
>> On Tue, 21 Nov 2000 00:37:18 -0000, Wally wrote:
>>
>> >Hi Mariss, what is your point about the tantalum caps. If you
>abuse
>> >anything it will break. I am talking about tantalum caps in
>normal
>> >operation.
>> >
>> >
>
>
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Discussion Thread

dave engvall 2000-11-18 11:54:28 UTC emc success Jon Elson 2000-11-18 22:43:55 UTC Re: [CAD_CAM_EDM_DRO] emc success dave engvall 2000-11-19 08:38:34 UTC Re: [CAD_CAM_EDM_DRO] emc success Jon Elson 2000-11-19 23:28:49 UTC Re: [CAD_CAM_EDM_DRO] emc success Wally K 2000-11-20 00:56:13 UTC Re: emc success Jon Elson 2000-11-20 12:01:31 UTC Re: [CAD_CAM_EDM_DRO] Re: emc success Wally K 2000-11-20 13:28:57 UTC Re: emc success Mariss Freimanis 2000-11-20 15:49:49 UTC Re: emc success Wally K 2000-11-20 16:37:39 UTC Re: emc success Jeff Barlow 2000-11-20 16:56:57 UTC Re: [CAD_CAM_EDM_DRO] Re: emc success Wally K 2000-11-20 17:15:48 UTC Re: emc success Jeff Barlow 2000-11-20 17:53:18 UTC Re: [CAD_CAM_EDM_DRO] Re: emc success Wally K 2000-11-20 18:28:13 UTC Re: emc success