Dale,

Wrong.  40k max.  Assume the pot is wired from a pair of stiff sources
(Vcc/Vdd and GND for example).  Worst case (highest impedance) will be
with the wiper at mid-range.  Thats two 20k resistors in parallel for an
equivalent wiper (input) impedance of 10k (as recommended in the data
sheets).  Of course, I haven't seen a lot of 40k pots advertised lately
(25k is a standard) so in that sense, maybe you are (approximately)
right.

Regards,
Dave

Dale Botkin wrote:
> 10K.  That's the spec maximum input impedance, meaning you can use a 20K
> pot at most (right??).

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads