Re: [Phys-l] Ugh - RLC circuit issues

[Bernard Cleyet <bernardcleyet@redshift.com>]

bc is still living in the 50's and 60's,   

and I was lazy;  yes usually labelled (in the 50's and 60's) + >> -  .

I am informed -- I would think the losses for both would be the same, 
but perhaps TaO (Ta2O5) is less "porous than AlO (Al2O3)

Wiki. also points out the oxide layer is much thinner; probably greater 
puncture resistance too.


http://en.wikipedia.org/wiki/Tantalum



bc, thinks comparing loss tangents of both w/ same cap. would be 
instructive, and curious if Josh used a Ta cap.?

John Denker wrote:

> On 05/19/2007 02:09 PM, Bernard Cleyet wrote:
>
>  
>
> > For starters never, never, never, use an electrolytic at greater than low audio frequencies. 
> >    
>
> That was good advice maybe 50 years ago, but times have changed.
> The so-called "tantalum" capacitors are a sub-category of
> electrolytics, and it is easy to get ones that work fine
> at 100MHz or beyond ... well above "low audio" frequencies.
>
>  
>
> > Electrolytics usually have a value rating of ~ +/- 100%
> >    
>
> More like +100% -0%.  That is, they never have less than
> the advertised capacitance, but they might have quite a
> bit more.  It depends on (among other things) the V(t)
> history that the capacitor has been exposed to.
>
> Therefore they are used in situations where all you need
> is "enough" capacitance.  They are not used in situations
> where the exact value of the capacitance is significant.
>
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