[sdiy] Quick CV output buffer query

[Roman Sowa]

That's still 100k regardless of what is between opamp's output and the
lead of feedback resistor. If you want gain of -1 +/-0.1%, then whatever 
voltage is across input resistor, must be the same on feedback resistor. 
Input is referenced to virtual GND, just like output. So whatever you 
insert between opamp's output and feedback resistor, will not concern 
you at all.
I don't know if it sounds clear, can't explain that more simple.

Roman

W dniu 2016-10-13 o 13:17, Tom Wiltshire pisze:
> Hi All,
>
> I'm planning a inverting op-amp mixer mixing some CVs in a module.
> This is then fed to the standard CV output like Olivier has done here
> (page 2):
>
> http://mutable-instruments.net/static/schematics/Yarns-v03.pdf
>
> If my mixer uses 100K 0.1% resistors, I can be sure what I get out is
> the same (but upside down) as what I put in. No problem.
>
> How do I arrange that with the output buffer? If I use 100K for the
> feedback resistor, and 1K for the output protection, do I need a 101K
> input resistor? How does that work?
>
> Thanks, Tom
>
> _______________________________________________ Synth-diy mailing
> list Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>