[sdiy] Cap heads-up

[ezion]

Hi Ian
Certainly worth a look, however you might want to get a in depth look
at the data sheet.
It has been a few months since I last looked at high value (SMD) ceramics but...
High value ceramics de-rate with applied voltage, often the
capacitance goes down rather quickly.
Think 5 to 20% of the capacitance left @ half the maximum voltage.
And some models show quite prominent dielectric hysteresis.

For AC coupling these parts are usually fine.
However for DC storage of energy, read the data sheet and keep in mind
that the same value COG form another brand or other series might
behave rather differently.


Cheers
Theo



On Wed, May 4, 2011 at 7:55 PM, Ian Fritz <ijfritz at comcast.net> wrote:
> Maybe everyone already knows this, but I don't remember it being mentioned
> here.  C0G ceramic caps are now available in values up to 0.22uF.  If their
> leakage is as good as for the lower values, these could be interesting for
> very low frequency LFOs, S/H circuits, etc.
>
> Digi # is 445-4758-ND
> TDK# is FK22C0G1H224J
>
> Ian
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>