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[DPRG] emitter/collector/base

Subject: [DPRG] emitter/collector/base
From: montgomery f. tidwell mtidwell at practicalmatters.com
Date: Wed Jul 25 11:38:27 CDT 2001


oh, i figure at some point it will all make sense. :)

i could just go out and buy a LM7805. but i figure that there
must be something similar on some piece of "scrap" electronics
that i have laying around.

in this case, i found an a1015, looked it up on the NTE site. it
seemed to convert one voltage to another (not sure if it is
>from high to low, or low to high). i thought that i'd just hook
it up to a 9V and using my multimeter, figure it out. however, the
labels on the pins were emitter/collector/base (with my limited
electronics knowledge doesn't really tell me anything). hence
my question.


Rodent wrote:

> um...
> Maybe you guys need to point Montgomery in the right direction as simply as
> possible.
> It looks to me like he is in need of some basic electronics info and you
> guys are debating all sorts of stuff that I'm sure is confusing the heck out
> of him.
> ----- Original Message -----
>>>The full part number is 2SA1015.  All Japanese bi-polar
>>>transistors begin with 2Syxxx.  Where the y is a letter A, B, C
>>>or D.  A and B types are PNP.  One is for high frequency (I don't
>>>remember which).  C and D are NPN with the sam differences.
>>>The PNP type can be used as a simple emitter follower negative
>>>voltage regulator or an advanced LOW DROP OUT positive
>>>regulator.  Without knowing whether you are trying to regulate a
>>>positive or a negative voltage I can't give you details on where
>>>the input or output pins are.  But in normal operation the
>>>voltage across the emitter and base pins should not exceed .7
>>>volts (cant tell you polarity as stated above).
>>>The fact that it is listed as an audio transistor makes no
>>>difference as a regulator since the frequency you are running is
>>>zero or better known as DC.
>>This is not quite true. In today's circuits, the power supply often
>>must have a frequency response which is fairly high, often extending
>>into the MHz region.
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