I also run 84s from 4x1.5V batteries - but I have a
reverse-polarity-protection diode in the positive lead from the battery
holder, so the most I get is 5.4V from fresh batteries. Now *THAT* is within
spec. And as the batteries run down the voltage will drop lower.

Hmmmm 2.0 to 5.5V operating range for the 84; is it *JUST* a coincidence
that this is the range I get from 4xAAs with a diode ???

Bye.

-----Original Message-----
From: Drew Vassallo [mailto:snurple@HOTMAIL.COM]
Sent: Wednesday, 14 March 2001 12:20
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: Interrupt RB0/INT - Relay


>>I am using a 16F84 and powered by a battery of 5.5 - 6.0 Volts. No
>>regulator.
>
>The 16F84A is rated for use between 2.0 and 5.5V
>Either use a regulator or a lower battery supply.

I agree with the suggestion for the NPN (see my post earlier), but my
datasheet says the '84 is good to Vss+7.5V max rating.

I regularly run '84s with 6V batteries.  Never had a single problem.  I
doubt this is causing the problems you mentioned, it's more likely the fact
that you're driving the relay directly.  Try that first.  If all else fails,
try the supply suggestion.  If that's it, I'll eat my hat.

--Andrew
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