Date: Sun, 19 Jan 2003 21:10:23 -0700
From: Jim Drew
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Subject: Re: Transistor leaking? :)
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Spehro Pefhany wrote:
> On Sun, 19 Jan 2003 20:00:14 -0700, the renowned Jim Drew
>>I disconnected the 10K resistor connected to the base of the 2N2222A
>>(the 100K to ground is still there), and the problem still occurs - no
>>change at all, so its not some sort of parasitic load from the PIC when
>>not being powered.
> What happens when you disconnect the 10K connected to the base of the
Same thing... I am still getting the leaking. Now, what I find really
odd here is that the collector voltage is about .47 volts, and this is
fed into the 7805, but the output of the 7805 is about 1 volt! How can
the output be higher than the input? This is magic! :)
I tried using 1K biasing resistors for both transistors, same story. I
am going to change the 100K resistors to something lower and see what
happens. This is a real head scratcher. There has to be something
obvious here. The EBC connections are right for both transistors??
Correct??? I did check the legs (S0-223 package), and it matches the