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

[cheater cheater]

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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