On 26/01/2011 18:24, Olin Lathrop wrote:
> V G wrote:
>> 3. The AD620 requires a negative supply voltage. How would you guys
>> recommend going about this?
> Since this is a one-off, a easy answer is to split the battery pack.  I
> didn't check what supply range the AD620 needs, but you can use 4 AA to m=
ake
> +6V and another 4 AA to make -6V.  That's a bit klunky, but for a one off
> that shouldn't be much of a issue.
>
> Check the AD620 and see what supply rails it needs.  Maybe you can use
> +-4.5V (3 cells each side) or less.
>
>
> ********************************************************************
> Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
> (978) 742-9014.  Gold level PIC consultants since 2000.
OR ICL7660
maybe.

I have also used the RS232 interface chip to get + and - 9V supply from 5V

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