electronics q...pat need your help.

PAT

PAT

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ok. so i have a question about a small amp. circuit. its for school and i cant figure it out. mcrat...im sure you could figure it out.
here is the wording of the question.

"in the graph provided draw the requested information in relativity to the other information. provide Vout for the Vin. indicate amplitude of Vout and be able to explain. indicate the relative current for RL in respect to Vout and the current of C-E. additionally indicate the voltage of RL in respect to Vout. show your time scale and be able to explain your work"

if any of you guys can help me out, i would appreciate it.:thumb:
 

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Sledhead

Sledhead

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The collector (and RL) current is the base current times the gain Beta (not given, assume 100?)

As base current and collector current increase, VRL rises and VCE decreases as Q approaches saturation. A lower Vin, drops collector current which reduces VRL and VCE increases as Q approaches cut-off. It is an inverting amplifier.

AC gain may also be spec'd as hfe.
 
PAT

PAT

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If you had to draw Vout, Irl,Vrl and Ice what would you go about this?? I have a problem with this scat and typed out the question word for word. The answer blocks are asking for a drawing of each Vout, Irl, Vrl and Ice. But I'm not really sure what the hell to put. I'm pretty lost as to what they want. My guess is that they want a sine wave showing V drop and current across rl as Q changes?
 
Sledhead

Sledhead

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HFE is another term for Beta, Japanese abbreviation or something. HFE is DC gain, hfe is AC gain IIRC. All basically the same value but hfe is function of frequency.

As Vout increases, the transistor is 'turning off' and Ice and Irl and Vrl are all decreasing.

The wording and the questioning are different to me, maybe poor translations from a different language?
 
PAT

PAT

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yea i remembered what it was after i pondered it a little longer. i think that i understand the question now. i think what they are wanting to see is the relationship of Vout in relation to I and V on rl as well as the I on the transistor. as well as an explanation of how the circuit is working. if not, then im telling him that his damn question doesnt make any sense to me. i agree with you. i think its worded funny. but i think i got it. do you mind giving me your opinion of the sine waves that i drew out if i take a pic and post it?
 
Sledhead

Sledhead

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PAT said:
yea i remembered what it was after i pondered it a little longer. i think that i understand the question now. i think what they are wanting to see is the relationship of Vout in relation to I and V on rl as well as the I on the transistor. as well as an explanation of how the circuit is working. if not, then im telling him that his damn question doesnt make any sense to me. i agree with you. i think its worded funny. but i think i got it. do you mind giving me your opinion of the sine waves that i drew out if i take a pic and post it?
Click to expand...

No problem but I'm headed out in a bit.
 
08txlmm

08txlmm

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MACKIN said:
I'm going out on the limb here and "assuming" someone needing such useless information is probably studying to be a engineer. :D (J/K) no clue actually.
Click to expand...

That's exactly what I was thinking. We had to do some of that for mechanical engineering but luckily we didn't have to go that in depth.

PAT said:
Enganmaneering lol it's a royal pain. But I gotta do something to make more money than what the military gives me.
Click to expand...

Yea engineering is a tough one but you do start out making some good money right out of college. Even internships pay well. I'm graduating with a mechanical engineering degree in May btw.
 
PAT

PAT

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This is actually a pretty simple circuit. It's a basic amp is all. I was just confused with the wording and what they were wanting. But I got it right. So that's good.
 
PAT

PAT

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08txlmm said:
That's exactly what I was thinking. We had to do some of that for mechanical engineering but luckily we didn't have to go that in depth.



Yea engineering is a tough one but you do start out making some good money right out of college. Even internships pay well. I'm graduating with a mechanical engineering degree in May btw.
Click to expand...

CONGRATS! I still have a pretty long ways to go.
 
McRat

McRat

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Pat, you got the wrong guy! :D

I'm the one who spent a week in the UCI Burn Ward for playing with electricity. Me and electricity are bitter enemies...

Glad you got an answer though. I'm trying to teach myself electronics in my "spare" time. Now if I can just find out where you buy spare time, I'll be set!
 
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