A Whetstone bridge type pressure transducer is ratiometric. You don't really need a regulator for that. You do need to keep track of the voltage and apply a multiplier to fix the decreased readout for lower voltage. I do not know of a regulator that goes that low but they should exist. Peter -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu