[sdiy] Precision voltage offset

[GothGeek Sysadmin]

On Fri, Jan 25, 2002 at 04:16:17PM -0500, media at mail1.nai.net wrote:
> At 11:29 AM -0800 01/25/02, GothGeek Sysadmin wrote:
> >
> >I'm trying to offset a CV by a set amount.  Offset it down in fact.  The
> >idea here is to offset F0 to 0 volts so I can use a standard Midi/CV with
> >my Moog without having to patch it to a keyboard and use its transpose
> >feature.  ( yes, I'm on the same quest I mailed about a month or 2 ago ).
> 
> So you want to add a negative voltage to another voltage??  Do you know
> excactly how much voltage you need to add??

Having not done much with CV yet, I was planning to just measure this when
the time came to set the offset.  But calculating it looks to be 0.417 volts.
I may have trouble getting the precision voltage source that I like to use
on a Saturday unless I can cross it to an NTE part and buy it from Frys.
I hate Frys. 

I have a feeling the best way to do with is just by hacking the 8x5x code
in the MidiCV box since Paia supplies full source, but I need the experience
trying to cook this up analog.  What really makes me feel bad is after
a decade out of school I'm thinking of going back to work on my EE and I
cant even do something as simple as this :-/

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