<div dir="ltr">What's wrong with the cheaper LM4040's?<br><br>e.g. <a href="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</a></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Mar 28, 2021 at 3:09 PM cheater cheater <<a href="mailto:cheater00social@gmail.com">cheater00social@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">You want a REF03 voltage reference from AD. That's the easiest and<br>
best way of doing this.<br>
<br>
On Sun, Mar 28, 2021 at 9:42 PM Neil Harper <<a href="mailto:metadata@gmx.com" target="_blank">metadata@gmx.com</a>> wrote:<br>
><br>
> so now that I have my own little VCO going on the breadboard, i want to<br>
> do a perfboard module with it for my system. so now I'm thinking about<br>
> how this VCO will remain stable in a system where the rails might be<br>
> fluctuating.<br>
><br>
> the first issue i see is that my LM311 comparator takes a reference<br>
> voltage drawn from my +15V rail through a resistor to set the trip<br>
> point. if that +15V waivers, so will my trip point.. and so will my<br>
> frequency. so should things like that be derived from an onboard<br>
> reference instead? is this common practice?<br>
><br>
> I see in schematics like the ENS-76 VCO (<br>
> <a href="http://www.synthsource.com/ens76/vcofig6.jpg" rel="noreferrer" target="_blank">http://www.synthsource.com/ens76/vcofig6.jpg</a> ) that the comparator<br>
> reference is just taken from the rail (through R13, R14 divider). Same<br>
> with Thomas Henry's VCO-1's, lots of references right off the rails.<br>
><br>
><br>
><br>
><br>
> --<br>
> /// Neil Harper<br>
> /// Every Wave is New Until it Breaks<br>
><br>
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</blockquote></div>