2009/6/26 Kirk Wallace <kwall...@wallacecompany.com>:

> Either way, a 2n3904 is much less expensive than a DAC.
> One concern is, how much error will be introduced?

If you use an Op-Amp as your buffer, then almost no error will be
introduced and you don't need any external components. They only cost
pennies, too. Just make sure you get a rail-to-rail one.
http://talkingelectronics.com/projects/OP-AMP/OP-AMP-1.html

-- 
atp

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