[sdiy] Programmable ICs / Scaling

[nN AAt e e]

> I take it, that you are looking for a means of translating a non-standard
CV to 1V/Oct.
> If you're working in the analog domain you could do something like this
for the V/Hz (PAiA/Korg) CV case:
> V/Hz CV input from synth -> Scale pot (adjust for linearity) -> 'anti-log'
amplifier -> scale pot (adjust for 1V/Oct) and buffer -> 1V/Oct CV output
> However, the resulting 1V/Oct output may not be perfectly linear as
voltage-to-voltage conversion between linear and log tends to be error
prone.
> If the source CV is linear but not 1V/Oct, then a simple non-inverting
op-amp scaling circuit will work.
> In the digital domain, you'll need to account for the accuracy of the
analog to digital conversion of the log V/Hz voltage - especially on the low
end.

the one problem is that i dont know if its linear or logorithmic, and i wont
know until at least saturday night or when i get around to checking it out.
i hope its linear as that will make things much much easier. if its linear i
will probably try to keep it analog, if its log, i probably will go the
digital path. figuring out the log scale will be easy, just press a few keys
and enter the data; let texas instruments do the rest. im not the best at
math [considering i havent even finished my second year of algebra yet...],
but im sure it wouldnt be too hard to figure out the programming and math
for the conversion to 1v/oct from whatever it uses.

all of this asuming that its not even 1v/oct to begin with... i hope it is;
math hates me.

- nate