Dan,
I did not want to use a Low Dropout regulator due to the loss of voltage.  I
have not looked in a couple of years, but I think the best on the market
still takes away 1.1 VDC.  I may go to a regulator in the future, as someone
may want to "hotwire" the product with a 9V battery.
I am continuing with a diode in series of the PIC's power supply.  Filter
cap is on the PIC side of the diode.
Best regards,
Giles

>
>Giles, if 6v is critical, you can go with the older PICs - pre-flash,
>as they handle a wider Vcc range. I am assuming you are not using
>an LDO regulator in the ckt, but rather running directly off your
>battery. Personally, I think I would go with a regulator.
>
>- dan


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