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#1
11-04-2010, 01:33 PM
 MrRockchip Junior Member Join Date: May 2010 Posts: 18
Problem with transistors

I have 5 problems, which are similar to each other.
But I need an example. Please, help me to solve this one:
(and I will solve the remaining 4 by myself)

#2
11-04-2010, 01:52 PM
 Kermit2 Senior Member Join Date: Feb 2010 Posts: 2,420

I'm a long time out of school, but I think at least one more piece of info will be needed to answer that. Yes it will either conduct or not conduct at the extremes, but I believe the transistors gain must be known to get an expression for the output.
__________________
I'm too old.
#3
11-04-2010, 02:32 PM
 MrRockchip Junior Member Join Date: May 2010 Posts: 18

If don't count the thermal current, then you have all the necessary data.
#4
11-04-2010, 03:04 PM
 Kermit2 Senior Member Join Date: Feb 2010 Posts: 2,420

well like I said, I'm out of school a long time, so carry on smartly then soldier
__________________
I'm too old.
#5
11-05-2010, 02:22 AM
 hobbyist Senior Member Join Date: Aug 2008 Posts: 716 Blog Entries: 21

Take a look at your circuit, the bottom transistor has it's base emitter junction conducting because it is forward biased, however the collector is not biased at all, due to the top transistor being reversed biased, and not conducting.

So your voltage is the voltage of a open collector transistor with full base voltage applied.

This is just a somewhat educated guess.

Last edited by hobbyist; 11-05-2010 at 02:38 AM.

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