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Date: Sun, 19 Jan 2003 22:36:01 -0700
From: Jim Drew
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Subject: Re: Transistor leaking? :)
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Spehro Pefhany wrote:
> You've got some path back to Vdd that you have not seen. Are
> you sure there's not a path back through the protection diodes of the
> microcontroller? What if you unplug the PIC? You're sure about
> the polarity of the diodes?
Thanks for everyone's input on this matter. I have a simple voltage
divider (two 15K resistors with one tied to ground, the other tied to
+B, and the middle tied to an analog input pin to give me a battery
voltage /2). I was a dummy and tied the +B side my voltage divider
directly to the battery input, and NOT to the collector of the FZT705...
so, there was always a .47ma draw, and a small voltage was in fact
making its way back through the circuit.
I am going to mod the circuit board and see what the current draw really
should be. Thanks again for your help!
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