Hello All,
          I have a project that I'm working on that runs of two D cells
in series.  I'm using a 16C711 that works from 2.5-5.5V.  On the ADC
port I have a 3VDC pressure transducer with a output of 0-60mV.  When a
certian pressure is reached a solenoid valve opens.

Here's my problem.  I want this to be effecient on battery power so I'd
like to run both sensor and pic at 2.5V trouble is even LDO's will
dropout at about 2.7V.  The solenoid works to about 2.4V.

What I was thinking of doing is not using a regulator so the voltage
would vary over battery life about 1.6-1.25.  Vref (I have it set at
about 70mV) should drop with respect to battery and so should the output
of the sensor (it's a wheatstone bridge configuration).  I also have the
pic calibrate on boot.  So these three attributes combined I would
believe would be enough to not have to use a regulator.

Any thoughts?  Any ideas on a reg that would output 2.5V until the
voltage dropped below 2.5V?

Aaron

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