[sdiy] Voltage references in VCO

[Ian Fritz]

At 08:22 PM 4/14/06, elmacaco wrote:

>Kevin Lighter identified some jitter that appears to be slight noise
>modulation of the pitch, I wonder if dialing in a small amount can really
>result in that sound.  I'll have to try it on some of the weaker oscillators
>around here and see if it helps.
>
>This maybe of interest, it's where Kevin has a short video clip of a scoped
>moog oscillator showing this jitter.

LOL.  He thinks he's "scientific" but he doesn't tell us much about what he 
measured.  What was the frequency?  What is the time scale on the scope 
shot?  Does the jitter depend on frequency?  Isn't VCR digital?  What's the 
spectrum of the noise?  And of course you can't ever question anything he 
does or says.

If someone would be willing to post a short *.wav clip of one of these 
moogey waveforms, it should be quite simple to analyze the spectrum.

   Ian