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

[Tom Bugs]

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 
> <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 <mailto: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
>     <mailto: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
>     <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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