[sdiy] Hybrid VCO

[Tim Parkhurst]

> From: Glen [mailto:mclilith at ezwv.com]
> Subject: RE: [sdiy] Hybrid VCO
> 
> At 05:28 PM 10/17/02 , Tim Parkhurst wrote:
> 
> >Perhaps a combination of both approaches might do the trick.
> >Read the temp sensor to perform fast, small adjustments
> >(several hundred or even a few thousand times per second),
> 
> After the unit has been powered up for a few minutes, do you really think
> that its temperature is going to change significantly within the space of
> a
> hundredth of a second? I doubt that the temperature needs to be checked
> quite so often.
> 
> later,
> Glen Berry

Hi Glen,

The main reason I'd want to check the temp sensor fairly often would be to 
avoid audible jumps in the frequency by making many small corrections rather
than a few large ones.

Rethinking things a bit, I suppose you could get away with checking once a
second (or even less) and then making sure the micro slowly ramped in the
adjustment.

The frequency based adjustment is probably the one I'd want to do at a
fairly high rate since that is how the unit would compensate for tracking,
scale, and other non temperature related problems. (thanks for the
feedback!)

-Tim Servo-



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