Arduino ADC question...

[Tony Hardie-Bick]

http://www.ecircuitcenter.com/circuits/opsum/opsum.htm

one of the inputs will be a high reference voltage, the other the bipolar CV,
choose the resistors so you shift the lowest output to 0V, and if necessary add 
some gain to get the desired signal range.

Put the equations (with separate resistor values for each input) into a 
spreadsheet and tweak :) Keep in mind the gain will be affected by CV output 
impedance unless you buffer it.

Tony (HB)

On 18/10/11 16:28, James Coplin wrote:
> Thanks Jay, those will be useful in the future.  However, I'm not
> attempting to output CV, I'm attempting to read an input CV with a
> negative component.
>
> James R. Coplin
>
>
> -----Original Message-----
> From: music-bar-bounces at lists.music-bar.org
> [mailto:music-bar-bounces at lists.music-bar.org] On Behalf Of Jay Vaughan
> Sent: Tuesday, October 18, 2011 9:09 AM
> To: Music-bar
> Subject: Re: Arduino ADC question...
>
>> I'd ask since I'm not getting a satisfactory answer on the Arduino
>> forums or elsewhere.
>
> Some links about how to do it here:
>
> http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1169703529/all
>
> And here is a nice schematic:
>
> http://tomscarff.tripod.com/cv2midi/cv2midct.gif
>
> Look at the yellow section ..
>
>
> ;
> --
> Jay Vaughan
>
>
>
>
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