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circuit design

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mike220

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i need to design a voltage divider baising circuit with Re=1k Ic=55mA using a 2n3904 and must have the q point in middle of load line. help please. Vcc=16v you need to pick your own resistors for r1 r2 rc
do you think the 1k needs to be changed? is 55ma even possible with 16v and re=1k
 

Roff

Well-Known Member
You need to supply more information. What is the supply voltage(s)? Is there a collector resistor, and if so, what is its value?
Do you realize that your 1k emitter resistor will have 55 volts across it, and will dissipate 3 watts? Perhaps you meant 55ua instead of 55ma?
 

mechie

New Member
Multiple postings

Please confine your posting to the most appropriate forum, you just waste space and confuse people with multiple postings.

ps. I never liked homework when it was for my own benefit - this looks like a set question - will you share the award when you pass?
 

Roff

Well-Known Member
mike220 said:
i need to design a voltage divider baising circuit with Re=1k Ic=55mA using a 2n3904 and must have the q point in middle of load line. help please. Vcc=16v you need to pick your own resistors for r1 r2 rc
do you think the 1k needs to be changed? is 55ma even possible with 16v and re=1k
Mike, you shouldn't expect to have your homework done for you. I will give you some clues:
1. A transistor doesn't generate voltage or current - it only allows you to control them.
2. If you are taking a class, you must have covered Ohm's law at this point. Do the math - can you get 55ma through a transistor with a 1k emitter resistor when you have a 16v supply?
 

mike220

New Member
mike220 said:
i need to design a voltage divider baising circuit with Re=1k Ic=55mA using a 2n3904 and must have the q point in middle of load line. help please. Vcc=16v you need to pick your own resistors for r1 r2 rc
do you think the 1k needs to be changed? is 55ma even possible with 16v and re=1k
55ma is an error ,it should have read 5.5mA
That makes more sense
 
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