[sdiy] Pots read by microcontroller and sourcing question

[David G Dixon]

> Hi thanks for the replies.
> 
> I'm using an Arduino. Looks like ideal input impedance of 10kb or less

If you use an opamp buffer in front of every pot, then the output impedance
to the uC is effectively 0 ohms.  This will cost you about 10 cents per pot,
so not really a bank-breaker.  I personally would never take a voltage
directly from a pot for this sort of control, since you really can't
guarantee linearity unless you feed the pot to a near-infinite impedance
such as the + input of an opamp.