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<p>I have now ;-) Problem is they are expensive. Cheapest one I can
find that can put out >= 10 MHz is $7</p>
<p>--tr<br>
</p>
<br>
<div class="moz-cite-prefix">On 5/6/2016 10:54 AM, Richie Burnett
wrote:<br>
</div>
<blockquote cite="mid:ABC48898203647919451685E5F8E2C82@RICHIEPC"
type="cite">Have you considered using a DDS chip for your master
clock? These can generate frequencies well into the 10's of MHz,
programmable to milli-hertz resolution, and can be made to change
frequency at the drop of a hat without any of the "loosing lock"
issues of PLLs.
<br>
<br>
-Richie,
<br>
<br>
<br>
-----Original Message----- From: Tim Ressel
<br>
Sent: Friday, May 06, 2016 4:30 PM
<br>
To: <a class="moz-txt-link-abbreviated" href="mailto:synth-diy@dropmix.xs4all.nl">synth-diy@dropmix.xs4all.nl</a>
<br>
Subject: Re: [sdiy] Vibrato range
<br>
<br>
<br>
<br>
Good point, Roman. I'm planning to use a PLL to drive a pair of
clock generator chips to create top octave frequencies. The PLL is
so that I can do vibrato. There is a PLL trick where you sneak in
a signal to vary the VCO without the PLL losing lock, thus FM-ing
the VCO.
<br>
<br>
<br>
Static pitch bend is another issue. The trick of FM-ing a PLL does
not work for DC. Writing values to the clock chips directly uses
I2C and a cumbersome calculation and there is 13 outputs to
update. I doubt that will be fast enough for pitch bend. I am not
sure how to implement a clock that is both accurate and bendable.
Guess I'll have to play.
<br>
<br>
--TimR
<br>
<br>
<br>
<br>
<br>
On 5/6/2016 1:02 AM, Roman Sowa wrote:
<br>
How about PitchBend? Musicaly usefull vibrato may not have much
detune range, probably less than +/-50 cents, but the same TOG
will also have to take care of Pitch Bend, right? Default range is
+/-2 semitones, but +/-1 octave is not uncommon.
<br>
BTW, MIDI pitchbend range can be set by RPN message to a level
beyond sanity.
<br>
<br>
Roman
<br>
<br>
W dniu 2016-05-05 o 16:30, Tim Ressel pisze:
<br>
Hey all,
<br>
<br>
I am constantly humbled by how much I do not know, just as I am
amazed
<br>
and grateful at how helpful you all are. And once again I need a
little
<br>
help. When doing vibrato -- frequency shift as opposed to time
delay -- what is a typical range?
<br>
<br>
Context: I am doing a top octave generator and am at looking at
varying
<br>
the clock freq to implement vibrato.
<br>
<br>
Thanks!
<br>
<br>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
--Tim Ressel
Circuit Abbey
<a class="moz-txt-link-abbreviated" href="mailto:timr@circuitabbey.com">timr@circuitabbey.com</a></pre>
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