According to IVP on Wed, 01/23/13 at 15:29: > =20 > A fresh alkaline is 1.65V, so 3 would be as high as 4.95V (something > you learn when powering logic off of batteries) Wow! Amazing! Who'da thunk? :-) > Perhaps measure the battery voltage during operation and after the > unit stops working, also the current draw Okay, that sounds do-able. > Some designers are fiendishly clever, and can make a circuit work > within a narrow window but don't give a hoot about battery life Yes, tell me about battery life... :-( > Similar to what Sean mentioned, I've seen a lot of people over at > the laser LED sites using 2 batteries without active current limiting > ("just stick 3V on it, you'll be fine"). There's 3V, and then there's > 3V Heh... :-) > Ideally you'd want to characterise your tapestry with a PSU that > has voltage and current settings. You can make a basic one with > a couple of LM317s. One sets the voltage, another sets the current >=20 > http://www.ti.com/lit/ds/symlink/lm117.pdf Very nice. Thanks! Boy that reference sure takes me back! :-) > Worth having a few in the parts box. Figure 36 shows how you use > one as a current limiter - as an alternative to a resistor - to simulate > the battery impedance I believe I do have a few in my parts box. Lots of reading to do... :-) Thanks again! Regards, web... --=20 William Bulley Email: web@umich.edu 72 characters width template ----------------------------------------->| --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .