MOTM

http://www.analog.com/library/analogDialogue/pot/potpourri.html

You can download some of the books for free, such as "Op-Amp 
Applications" and "Designer's Guide to Instrumentation Amplifiers."  
Some interesting stuff in the "Solutions/Applications - Audio" area 
such as info on capacitance touch sensors instead of switches, a 
digital potentiometer, etc.

Ivan


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