[sdiy] VCO drift

[jhaible at debitel.net]

> I use a 4069UB VCO (René's design) in a synth and find it quite stable.
> There is no noticable change in frequency against temperature.  

Rene's schmitt trigger thresholds only depend on resistor values and
saturation voltage of the gates, so temperature effects are expected
to be small. 

JH.

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