Hi!

I am looking at controlling the frequency of a wienbridge oscillator using a
digital potmeter. My problem being that digital logarithmic potmeters don't
come in anything > 256 steps. Because of that I have decided that I want to
add a "pad-resistor" that is connected to one end of the potentiometer and
the wiper, to *simulate*  a log taper. [ See
http://www.edn.com/article/CA46509.html ]. All I need to do is implement a
correction-table to *correct* any possible deviations from a logarithmic
scale, or that's my plan anyway!

Are there any better ways to make a correctional table other than using a
lookup table that *jumps*? I would like to be able to calculate the
correction on the fly and return the corrected value. Is that a good idea?
Any tips?

Thanks,

Sean
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist