Hi
Would a FET do the job of a reverse polarity protection diode for Michele?

Perhaps an N-channel FET in series with the battery supply,
with Source to batt. -ve, Drain to +ve, and gate tied to Drain??

I seem to recall that the FET would have a significantly lower Vdrop than
a diode, and can handle Drain - Source reversal no problems. Is this so?
(No FET experience myself (just bipolar), and would like to know too.)

</David_V.>
-------------------------------------------------------------
> Hello List,
>
> I have realized an alarm for my bycicle using a 12C508. It is powered by
two AA
> size alkaline battery.
>
> I would like to know if there is a simple (and economic!!) solution which
> I can use to protect my circuit against polarity inversion during battery
change.
> (I know it's a remote possibility, but it exists)
>
> I thought to use a serie diode, but the voltage drop bring the PIC power
voltage
> near the power supply limit of the MCU.
>
> Thanks.
>>
> Best regards,
> Michele
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