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From time to time my HP ze4100 laptop running Windows XP professional loses all the link info to the desktop icons plus the document history is emptied and no longer updates apparently. The icon labels come up but all icon images are changed to something generic, all but Internet Explorer, at...

First, let me thank all of you for the tremendous response. Excuse the cofusion but I don't have the particulars on the measurement circuit but it works fine with a real resistors and is very accurate. I was thinking of the digpot idea, thanks nbucska, and implementing an R stick/comparator...

I've two circuits, one measures a resistor using a series of pulses. Another separate circuit outputs a current in proportion to a given input. I can't modify the first circuit but I'd like to use it to monitor my current circuit. Is this possible? Can I use a fet or transistor in a common base...

I've a tank of C02 gas thats reads 1000ppm CO2.Is that equivalent to .1 percent or do I need to convert it to molecular weights of both gases Nitrogen and CO2 and use another formula?