[sdiy] Rene's 4069 VCO

[Kyle Stephens]

Good to know. Thanks!


_Kyle


--- On Tue, 2/24/09, René Schmitz <uzs159 at uni-bonn.de> wrote:

> From: René Schmitz <uzs159 at uni-bonn.de>
> Subject: Re: [sdiy] Rene's 4069 VCO
> To: lightburnx at yahoo.com
> Cc: "Synth-DIY" <synth-diy at dropmix.xs4all.nl>
> Date: Tuesday, February 24, 2009, 8:16 AM
> Kyle Stephens schrieb:
> > Another dumb if tangential question 'bout the 4069
> VCO:
> > 
> > Given that two inverter gates in the design make for a
> Schmitt
> > trigger, could you take the saw core and swap the
> Schmitt section for
> > a 1/6 of a 40106, and repeat the thing six times over
> (hex Schmitt,
> > hex inverter) for 6 VCOs?
> 
> In theory, yes. But the power dissipation of the 4069 would
> probably be too high. Running all six inverters in
> "class A" mode would make the chip run very hot.
> An additional reason against doing that would be that there
> would be some unwanted coupling between the VCOs. I.e. they
> would lock to each other.
> 
> Cheers,
>  René