Question about capacitors.

phantom power · Post by **phantom power** » Thu Oct 02, 2008 11:26 pm

When someone refers to a capacitor type as being a "bead", what are they talking about?

-AE

The Scum · Post by **The Scum** » Thu Oct 02, 2008 11:36 pm

Um, beads are usually inductors, not capacitors. (See also: ferrite bead)

Can you provide more context?

phantom power · Post by **phantom power** » Thu Oct 02, 2008 11:47 pm

Baby Animal parts list

It says 63v beads

-AE

RodC · Post by **RodC** » Fri Oct 03, 2008 5:06 am

Maybe it means:

1 x 0.1uF 63v with beads

Have you seen pics of the build? Is there a cap in there with beads on its leads between the disk and the PCB?

Jim Williams · Post by **Jim Williams** » Fri Oct 03, 2008 7:22 am

Tantalum beads, or dipped tantalum caps.

RodC · Post by **RodC** » Fri Oct 03, 2008 8:06 am

Jim Williams wrote:Tantalum beads, or dipped tantalum caps.

Yep he could be refering to the ones that look like little beads.

phantom power · Post by **phantom power** » Fri Oct 03, 2008 6:49 pm

Preamp Card Pic

2nd pic down shows 2 different configurations of the pre. You can see the 2 little yellow caps toward the middle of the board. These are the ones.

The oic is small, but I thought it might help anyway.

Is there a difference between regular tant caps and "dipped"? I guess whaty I'm really asking is; can I just use a couple of 63v tantalums?

Thanks for the replies thus far.

-AE

Jim Williams · Post by **Jim Williams** » Sat Oct 04, 2008 10:45 am

Those appear to be small mono ceramic psu bypass caps for the opamp. They are probably .1 uf, but I didn't examine the parts list.

Many caps are dipped construction, this includes silver micas, cheap green mylar "chicklets" from Japan, dipped film caps from other far east manufacturers, mono ceramic and dipped tantalums. Dipped construction where the cap is dipped in an epoxy coating is about the only thing these caps have in common, their interior construction is completely different.

Andy Peters · Post by **Andy Peters** » Sat Oct 04, 2008 11:09 am

phantom power wrote:Baby Animal parts list

It says 63v beads

-AE

Those are the standard sort of 0.1 uF ceramic cap in a through-hole package with pins on 100 mil centers. I have a big bag full of them here ... literally a lifetime supply. Any decent ceramic cap (X7R, NP0) will do ya fine.

I've never heard anyone refer to them as a "bead," although that's kinda what they look like. As Jim Williams notes, there are tantalum electrolytics that look like larger versions of these ceramics.

-a

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Question about capacitors.

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