Re: [TCML] Ceramic MMC?

["DC Cox" <resonance@xxxxxxxxxxxx>]

If the dielectric is barium titanate, they are very lossy at RF frequences.

If the dielectric is strontium titanate they work fine in small coils.

If you decide you wish to part with a few, I use them for DC filter caps on
my HV Van de Graaff power supplies.

Please advise off-list.

Dr. Resonance




On Fri, Jun 6, 2008 at 1:52 PM, Phillip Slawinski <pslawinski@xxxxxxxxx>
wrote:

> A local Electronics shop near me went out of buisness recently.  They
> were selling their entire stock at half off or better.  I managed to
> pick up 222 10000V 1000pf Ceramic capacitors for about $50.  They're
> red discs about 3/4" in diameter and 1/4" thick.  I've made a small
> mmc ~ .01 uf and it seems to perform with the exception of some arcing
> between the buss wires.
>
> My question is if these ceramic capacitors are going to perform poorly
> with RF.  I've established that they are pretty durable, and seem to
> put up with TC abuse.  Should I build the rest of my MMC with these
> caps, or am I wasting my time?
>
> I don't know the manufacturer of these caps, but I'm fairly certain
> they're ceramic.  They're quite dense for their size and it looks like
> they have some sort of glaze on them.
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