[sdiy] modern AD/DA chips?

[Tom Wiltshire]

On 6 May 2009, at 22:23, Tom Arnold wrote:

> On Wed, May 06, 2009 at 01:42:36PM -0700, Scott Gravenhorst wrote:
>>> At the high end of the scale, it was not repeatable, errors of a few
>>> hundredths were insanely noticable.
>>
>> At about what frequency did that occur?
>>
>> What waveform? (Out of sonic curiousity.   My guess would be: saw)
>
> anything over 1khz, waveform is/was Sawtooth ( deadsimplest VCO I  
> could make
> a bunch of at the time ).

Sorry if this seems like pointing out the bleeding obvious, but how  
do you know the errors are all in the MIDI->CV?

It'd be a pretty rare VCO that hit the same pitch repeatably to the  
degree you're talking about, wouldn't it, even if the voltage was  
spot-on?
And you say this was with the dead simplest VCO, so I assume without  
multiple layers of temp compensation and error correction and  
whathaveyou. Surely the VCO can't be relied on to be *perfectly* in  
tune each time?

Regards,
Tom