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Re: [softrock40] OP amp feedback capacitors.

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  • Patrick Bowen
    Thanks, Tony. I thought that might be the case. Glad to have it confirmed. Patrick AC0SR ... -- Patrick Bowen pbowen@fastmail.fm
    Message 1 of 4 , Jul 25, 2012
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      Thanks, Tony. I thought that might be the case. Glad to have it
      confirmed.

      Patrick AC0SR

      On Wed, Jul 25, 2012, at 01:39 AM, Tony Parks wrote:
      > Not critical Patrick. The assumption is that the RXTX will be used with
      > a soundcard that can sample at a higher rate and thus having the LP
      > break at a higher frequency makes sense. The 220pF capacitors will work
      > just fine in the Lite II.
      >
      > 73,
      > --
      >
      > Tony Parks
      > kb9yig@...
      > http://www.kb9yig.com
      >
      >
      >
      >
      > On Wed, 2012-07-25 at 03:11 +0000, ac0sr wrote:
      >
      > >
      > >
      > > In the Ensemble Lite II the OP amps use 390pF caps in the feedback,
      > > which would imply a low pass cutoff of about 80kHz, while the Ensemble
      > > RXTX schematic that I have uses 220 pF caps implying a cutoff in the
      > > neighborhood of 140 kHz. So is the value of the capacitor in this
      > > application very critical, or are we talking "in the neighborhood"
      > > values? I actually have a Combined Lite II kit that was given to me
      > > that was missing the 390 caps, but had a pair of 220's instead. I'd
      > > like to use them if I can get away with it.
      > >
      > > Thanks,
      > > Patrick AC0SR
      > >
      > >
      > >
      > >
      > >
      --
      Patrick Bowen
      pbowen@...
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