I still like the idea of using a smal DAC to provide the .5V reference.
With 4.5V as it's high-end reference, it would produce 0.494V

Pretty close, I think.

oh, well.

--Brendan

> The reference inputs on the PIC A/D can take up to 1mA during the
aquisition
> phase, so you'd want as low source impedance as possible if accuracy is

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