[sdiy] VCO that goes SHARP in highest octaves??

[Sarah Thompson]

Chip ceramic capacitors can show changes in capacitance with bias voltage.
If stable capacitance is necessary, then specifying something fundamentally
more stable like a polyester might be sensible, albeit at the cost of board
area.

On Wed, May 11, 2022 at 2:01 PM Richie Burnett <rburnett at richieburnett.co.uk>
wrote:

> > One issue when looking at HF oscillations is sometimes the scope probe
> adds enough capacitance or resistance to stop the oscillation...
>
> Then the "oscillator going SHARP" condition might go away when the probe
> is
> connected!?
>
> Neil Harper, I guess the VCO does eventually go flat again at some point
> higher than a C8 pitch?  The pitch errors you mentioned in cents aren't
> huge.  Does it get worse and worse above the C8 or does it get better
> again?
>
> -Richie,
>
>
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