On Wed, Oct 19, 2011 at 5:01 PM, William Pretty Security Inc <bill.pretty@xplornet.com> wrote:
Also I know it sounds trite, but why don't you use a battery and a linear
regulator ?
I know it's a pain in the ass, but it's a lot cheaper that 10 Overo's :-(

Bill

Make that 11.  I`m testing a linear regulator now, but it gets too hot to use for more than a short time (system is powered by two 18650 batteries in series, so 7.2-8.4V).   My other test was to add a super cap to the 3.3V switching regulator.  Worked fine for over 100 battery insertions.  The next day I inserted the battery and the Overo died, to the sound of much cursing.  I`ve tested the voltage on an oscilloscope, and the voltage goes up in a straight line with no overshoot when the battery is inserted.  The TPS chip on the Overo is supposed to be able to handle up to  4.2V and spikes up to 5.2V, so I have no idea what can be causing my problems.

If I don't' have a solution by Monday I`ll have no choice but to switch to a COM supplier that offers technical support such as schematic review services etc.