Don't overlook the fact that you can use a dual-pot chip, which will 
give you much greater
range. One pot could "ROUGH IN" the value, and the other fine-tune it.

But you will still need the table, I guess.

--Bob

>>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!
>>
>>    
>>
>
>
>  
>


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