Diego Sierra wrote:

>On Sat, 23 Feb 2002, Thomas C. Sefranek wrote:
>
>>Over what voltage compliance range?
>>What control voltage burden have you allowed?
>>
>
>The output voltage should be between 2V and 15V, then input voltage is
>about 18V.
>
>I will be happy with just an idea on how to do it.
>
>>Current is controlled with series resistance.
>>
>
>Ok, I see that, using a regulator such a lm317 I can have a constant
>current, changing the resistance connected to it I can change the current
>value; and now the question arise: who to attach the outputs pins of the
>pic to change that resistance value?
>
What granularity do you need?
For just a few values you can do a pseudo D-A with resistors.
Otherwise a "real" D to A is good for this.

>
>
>Cheers,
>Diego.
>
>--
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>
>
>

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