Integrating Capacitor

[Brian Towles]

Tony Clark wrote:

> > > I just want to know why, and why I can't use some
> > > other cap.
>
>    No one seems to mention Mica caps.  I used these in my VCO design and
> am quite happy with their specs (which are similar to polystyrene as far
> as I can tell).  The disadvantage is that they are expensive and large in
> larger values (nearly $2.00 for a 2.2nF) but hey, they aren't going out
> of production any time soon!  And they are built like tanks, unlike some
> polystyrene caps I got which melt real easily.

i just looked in the all electronics catalog and they stock surplus micas up
to 5600pf for 35 cents ... might be worth a try!

what is the typical performance of a mica compared to polystyrene?  leakage?
temp. dependance?

-brian