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From: Spehro Pefhany
Subject: Re: Transistor leaking? :)
X-Newsreader: Forte Agent 1.93/32.576 English (American)
Date: Sun, 19 Jan 2003 05:36:00 GMT
NNTP-Posting-Date: Sun, 19 Jan 2003 00:36:00 EST
On Sun, 19 Jan 2003 05:00:26 GMT Spehro Pefhany
>Second stupid question.. you've measured the voltage on the base
>of the 2N2222A and it is zero?
>Third stupid question.. you've put a scope on the PIC pin if
>the voltage isn't quite zero?
P.S. You should have some kind of hardware BOR circuit on the
microcontroller. Your circuit will turn the power on if the
output voltage at the PIC pin is > about 0.8V typically,
but the PIC isn't guaranteed to work properly until 2.5V or
more depending on the clock frequency and type. Even an
external BOR circuit may not be guaranteed to work below
1V or so. Changing the resistors to a 1:1 ratio as Ban
suggested would give you more margin for the BOR circuit
to do its thing.
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