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'Cap needed?'
2004\07\02@095338 by Robert B.

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I wouldn't short the pads, it will send any DC offset along to the ADC
thereby distorting the audio signal.  If you must, use a 0.1uf cap instead.
It will cut down the 3db point somewhat though, so replace it with a 1uf
when you get the part in.


{Original Message removed}

2004\07\02@223440 by Richard Graziano

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Substitute the 0.1 uF cap.  Chances are that it will pass the entire audio
spectrum.  You can probably calculate the bandpass characteristic.  My guess
is that it will work just dandy.  I would appreciate your feedback one way
or another, just out of interest.
{Original Message removed}

2004\07\02@224100 by Richard Graziano

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One other thing I forgot to mention.  When driving an ADC it is usually
important to drive it with as low an impedance as possible in order to avoid
alisaing.  Of course all ADC's are not the same so you should review the ADC
specs.  On rereading your application, I realized that it was coupling to
the ADC input.  I wonder what the input circuit is like.  It is possible, on
second thought, that you may need a larger value than the 0.1 uF, depending
on other input parameters.
{Original Message removed}

2004\07\02@225139 by Josh Koffman

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Sadly, I won't be able to report much. I managed to find some rather
small 1uF through hole caps and tacked them to the surface mount pads.
Not as clean looking as I'd like, but then, I'm likely the only one to
ever notice.

Josh
--
A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
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On Fri, 2 Jul 2004 22:34:41 -0400, Richard Graziano
<spam_OUTrgrazia1TakeThisOuTspamrochester.rr.com> wrote:
> Substitute the 0.1 uF cap.  Chances are that it will pass the entire audio
> spectrum.  You can probably calculate the bandpass characteristic.  My guess
> is that it will work just dandy.  I would appreciate your feedback one way
> or another, just out of interest.

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2004\07\02@234504 by Josh Koffman

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Well, at the moment, it's a moot point as it's not working heh. Guess
I'm going in to work tomorrow (as that's where my scope is). Ah well.

Josh
--
A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
       -Douglas Adams

On Fri, 2 Jul 2004 22:41:53 -0400, Richard Graziano
<.....rgrazia1KILLspamspam@spam@rochester.rr.com> wrote:
> One other thing I forgot to mention.  When driving an ADC it is usually
> important to drive it with as low an impedance as possible in order to avoid
> alisaing.  Of course all ADC's are not the same so you should review the ADC
> specs.  On rereading your application, I realized that it was coupling to
> the ADC input.  I wonder what the input circuit is like.  It is possible, on
> second thought, that you may need a larger value than the 0.1 uF, depending
> on other input parameters.

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.

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