[sdiy] VCO comparator's reference voltage - rail OK?

[bbob]

REF01/02/03 are listed as “not recommended for new designs” on th AD
site... EOL?

On Sun, Mar 28, 2021 at 5:48 PM cheater cheater via Synth-diy <
synth-diy at synth-diy.org> wrote:

> Sorry, I was thinking of REF01, the 10V one.
>
> Might as well use REF02 or REF03 depending on how you structure your
> signal.
>
> Is LM4040 just as good? I don't know. The last time we had a voltage
> reference megathread it was decided that REFxx is the best.
>
> On Sun, Mar 28, 2021 at 10:40 PM Tom Bugs <admin at bugbrand.co.uk> wrote:
> >
> > I'm also curious why REF03 - that's the 2.5V one, whereas the REF01
> would be a 10V ref.
> > I know many use the REF02 (5V) in euro (is 10V ref ok on +/-12V euro
> setups?)
> >
> > I use the 10V LM4040 for references & pots for manual control - I like
> that value as it gives 10oct at 1V/oct, a good sort of range.
> > I find it makes resistor values streamline nicely too.
> >
> > Personally I never really tried AD parts, though note their strong
> lineage.
> > LM4040s are available in a good range of voltages, accuracies & temp.
> stability values.
> >
> > On 28/03/2021 21:14, Pete Hartman wrote:
> >
> > What's wrong with the cheaper LM4040's?
> >
> > e.g.
> https://www.mouser.com/ProductDetail/Diodes-Incorporated/LM4040B25FTA?qs=GWgl%252BsiMZr%2F%252BaZ%252BmKrTIBg%3D%3D
> >
> > On Sun, Mar 28, 2021 at 3:09 PM cheater cheater <
> cheater00social at gmail.com> wrote:
> >>
> >> You want a REF03 voltage reference from AD. That's the easiest and
> >> best way of doing this.
> >>
> >> On Sun, Mar 28, 2021 at 9:42 PM Neil Harper <metadata at gmx.com> wrote:
> >> >
> >> > so now that I have my own little VCO going on the breadboard, i want
> to
> >> > do a perfboard module with it for my system. so now I'm thinking about
> >> > how this VCO will remain stable in a system where the rails might be
> >> > fluctuating.
> >> >
> >> > the first issue i see is that my LM311 comparator takes a reference
> >> > voltage drawn from my +15V rail through a resistor to set the trip
> >> > point. if that +15V waivers, so will my trip point.. and so will my
> >> > frequency. so should things like that be derived from an onboard
> >> > reference instead? is this common practice?
> >> >
> >> > I see in schematics like the ENS-76 VCO (
> >> > http://www.synthsource.com/ens76/vcofig6.jpg ) that the comparator
> >> > reference is just taken from the rail (through R13, R14 divider). Same
> >> > with Thomas Henry's VCO-1's, lots of references right off the rails.
> >> >
> >> >
> >> >
> >> >
> >> > --
> >> > /// Neil Harper
> >> > /// Every Wave is New Until it Breaks
> >> >
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