[sdiy] Vibrato range

Tim Ressel timr at circuitabbey.com
Fri May 6 20:17:01 CEST 2016

I have now ;-)  Problem is they are expensive. Cheapest one I can find 
that can put out >= 10 MHz is $7


On 5/6/2016 10:54 AM, Richie Burnett wrote:
> 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.
> -Richie,
> -----Original Message----- From: Tim Ressel
> Sent: Friday, May 06, 2016 4:30 PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Vibrato range
> 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.
> 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.
> --TimR
> On 5/6/2016 1:02 AM, Roman Sowa wrote:
> 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.
> BTW, MIDI pitchbend range can be set by RPN message to a level beyond 
> sanity.
> Roman
> W dniu 2016-05-05 o 16:30, Tim Ressel pisze:
> Hey all,
> I am constantly humbled by how much I do not know, just as I am amazed
> and grateful at how helpful you all are. And once again I need a little
> help. When doing vibrato -- frequency shift as opposed to time delay 
> -- what is a typical range?
> Context: I am doing a top octave generator and am at looking at varying
> the clock freq to implement vibrato.
> Thanks!

--Tim Ressel
Circuit Abbey
timr at circuitabbey.com

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