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Subject: Grounding the Base of Bipolar Transistors

Date: 02/06/03 at 2:18 PM
Posted by: Franklin DeMatto
E-mail: not@available.com
Message Posted:

I have a simple question:

Every book, tutorial, etc, that I see, shows when using a NPN transistor as a switch, you either need to have the base connected to voltage, and then it is on, or to ground, and then it is off. What I can't figure out is, why do you need to connect it to ground? Why can't you just leave it in the air?

For instance, the following is a common diagram:
__ C---+5V
+5V--o o----B
| E
(a)-> | |------LOAD----GRND
|
\
/
\
/
GRND

Why can't we just leave out section (a) ?

If anyone could help me, I'd really appreciate it, because I am stumpded.


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