[ARC5] Square wave oscillators

[Ian Wilson]

Hi John,

There is some confusion here. I looked up the words that Wayne used. This
led me
to look up the specs on the LTC1799, hence the 40ppm/degC figure.

There are also AD9850 modules on eBay for amazingly little ($5 or less,
free shipping).
These work very well except that the onboard filter isn't quite right. But
100% usable and
unbeatable at the price.

If you want stability the DDS chips are superb. If you want ease of use,
the R-programmable
oscillators are better. If you want moderate stability and excellent phase
noise, the Si570
is king. All depends what you want.

73, ian K3IMW


On Thu, Nov 21, 2013 at 5:27 PM, John Watkins <jpwatkins9 at yahoo.com> wrote:

> Ian,
>
> They also have them with a sine wave output.  It is the AD9850.  They are
> on eBay once in awhile.
>
> John. WD5ENU
>
> Sent from my iPad
>
> On Nov 21, 2013, at 18:29, Ian Wilson <ianmwilson73 at gmail.com> wrote:
>
> > Well, it's not a crystal replacement:
> >
> > ±40ppm/°C Temperature Stability
> > 0.05%/V Supply Stability
> >
> > .. could be a useful part to have around, though.
> >
> > 73, ian K3IMW
> >
> >
> >
> > On Thu, Nov 21, 2013 at 4:20 PM, Robert Eleazer <releazer at earthlink.net
> >wrote:
> >
> >> Looking for something else on ebay I found a seller that has "1khz to
> >> 33MHZ Oscillator module" for less than $10.
> >>
> >> This device produces a square wave.  I am very aware that such
> oscillators
> >> are very rich in harmonics but if it is substituted for a crystal (just
> the
> >> crystal) in an older design RF oscillator circuit, how well will it
> work?
> >>
> >> Thanks!
> >>
> >> Wayne
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