# please help transistor amplifier

by michael1978
Tags: amplifier, transistor
P: 133
 Quote by jony130
haha i rely dont find i find one like min 0.050+10*0.050=0.55, joney were i make now mistake, with my calculator pfff i am shame

JONEY can you tell me please how to calculate in my calculator please
 P: 133 Joney i know you know how to do it with calculator, can you tell me because i have in my hand calculator, i can find nothing in google the same result please....
 P: 353 Simply use your brain instead of a calculator. And if you still don't know how you should quit EE and start learn math.
P: 133
 Quote by Jony130 Simply use your brain instead of a calculator. And if you still don't know how you should quit EE and start learn math.
JONEY i use me brain, why you dont tell me to calculate with my calculator, you just help me, i thank you for help, just tell me a little bit, and i use a calculator, you help so much, help also this one
 P: 353 But I don't understand what is your problem? I_R1 = 50uA + 10*50uA = 50 + 500 = 550uA = 0.55mA = 0.00055A
P: 133
 Quote by Jony130 But I don't understand what is your problem? I_R1 = 50uA + 10*50uA = 50 + 500 = 550uA = 0.55mA = 0.00055A
joney i know this from begin to calculate this is easy, but my problem was other you forget,
i ask you for this

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o sorry joney i make you tired, i understand now, so if load current is 50μ we chose voltage divider current 10 larger then the load current, and we have

R2 = 1.7V/(10*Iload) = 1.7V/((this is 10 time larger)10*50μ(base current)) = 1.5V/500μA = 3.4K this i understand

but this i dont understand
I_R1 = 10*Iload + Iload = 11*Iload = 550μA

10*Iload(50μA)+Iload(50μA)=11(how we get 11 now)*Iload(50μA)=550μA

i dont understand that 11 how we get? 10*Iload(50μA)+Iload(50μA)=0.55 not 11 sorry i dont know where i make mistake, where come this 11, i dont know how to calculate, i know 11*Iload is 550μA
thnx for answer
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joney this 11 is my problem
 P: 353 OMG Look here We have this equation B = 10*A + A = 11*A The first part tell as that we have a ten apples and we need add one more apple. So we end-up with eleven apples .
P: 133
 Quote by Jony130 OMG Look here We have this equation B = 10*A + A = 11*A The first part tell as that we have a ten apples and we need add one more apple. So we end-up with eleven apples .
ah you mean so
10*0.0.5+0.0.5=
10+0.5+0.5=11

you mean like this
 P: 133 ooh joney boy, i make again mistake of is right, ooo thank you try a lot to explain me
 P: 353 In our cases we have 11 apples B = 10*A + A And apples are equal to 50uA of load current. So we substitute for A = 50uA B = 10*50uA + 50uA = 550uA And this is equal to 11*A = 11*50 = 550uA the 11 tell as that the R1 current is 11 times large the load current.
P: 133
 Quote by Jony130 In our cases we have 11 apples B = 10*A + A And apples are equal to 50uA of load current. So we substitute for A = 50uA B = 10*50uA + 50uA = 550uA And this is equal to 11*A = 11*50 = 550uA the 11 tell as that the R1 current is 11 times large the load current.
thank you joney for losing time for me and help i go to sleep tomorow work have a nice sleep
 P: 133 thank you ver much joney now i start to understand
P: 133
 Quote by michael1978 thank you ver much joney now i start to understand
hi joney, may i ask you something

if we take 10 large then load(50micro)this is all time formula
for i_R2=10*LOAD and I_R1 = 10*Iload + Iload = 11*Iload = 550μA
and
if we take 5 large then load(50micro)this is all time formula
for i_R2=5*LOAD and I_R1 = 5*Iload + Iload = 11*Iload =
is correct?

and can you tell me wich book, do you know some book where i can learn good electronics?
advice
now i am reading electronics principles 7 by malvino
P: 353
 if we take 5 large then load(50micro)this is all time formula for i_R2=5*LOAD and I_R1 = 5*Iload + Iload = 11*Iload = is correct?
Check your algebra skills because your answer is wrong.

B = 5A + A = ??

 and can you tell me wich book, do you know some book where i can learn good electronics? advice now i am reading electronics principles 7 by malvino
I don't know any good book. Try buy a book in your native language.
P: 133
 Quote by Jony130 Check your algebra skills because your answer is wrong. B = 5A + A = ?? I don't know any good book. Try buy a book in your native language.
is 6 i know now,

but the best books are in engish
 P: 133 CAN I KNOW, wich electronic software you use
 P: 133 joney my dear, are you here somewhere, i just wana say thank you for help, losing time for me....
P: 353
 Quote by michael1978 but the best books are in engish
I don't think so.
 Quote by michael1978 CAN I KNOW, wich electronic software you use
I use LTspice, but circuit simulations are not good for beginners.
Circuit simulators are worthless, or worse, if you don't understand your circuit pretty well before you simulate it. Still, it won't hurt you to play with it, so long as you always keep in mind that garbage in = garbage out, or, in the case of simulators, garbage in=sophisticated garbage out.

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