Please help transistor amplifier

[michael1978]

Well for Vcc = 10V the voltage gain is equal to 46V/V (0.9V at output for 20mV at input) because we don't included RL in our calculations when we solve for Re2.

my circuit look like this

 

[Jony130]

If so, your voltage gain is equal to 46V/V

 

[michael1978]

my circuit look like this , the voltage gain is correct almost the same like yours, but metter gain is not correct, WHY GAIN METTER NOT CORRECT

 

[michael1978]

If so, your voltage gain is equal to 46V/V

yes almost 2Mv*46=92MV my 94MV

 

[Jony130]

So everything is OK

 

[michael1978]

So everything is OK

yes now, but can you tell me jony how to find in transistore HFE
because when you design this circuit

first you say
First we need select BJT I choose BC546C with typical hfe = 520 and Hfe_min = 420
and after
Ib = Ic/Hfe_min = 4mA/420 ≈ 10μA (base current)

how me to find me Hfe, you know which software i use
thnx for help

 

[michael1978]

happy christmas to everybody,

jony can you help me for Hfe, i have to look in datasheet of i can look also in B2 spice?

 

[Jony130]

You can use your simulation program to find Hfe or datasheet it's up to you.

 

[michael1978]

You can use your simulation program to find Hfe or datasheet it's up to you.

so i have self to look in datasheet for transistor, because my simulator he tell me maximum of hfe but not a minimum of hfe

thnx for reply

 

[NascentOxygen]

You should run your simulation a number of times, testing that it works satisfactorily with hfe_max and hfe_min, and (for multi-transistor circuits) all combinations.

 

[michael1978]

You should run your simulation a number of times, testing that it works satisfactorily with hfe_max and hfe_min, and (for multi-transistor circuits) all combinations.

ah ok did you see the circuit was everything all right just type of transistor, which tell me Jony and he worked fine, because my software he tell me only hfe max not hfe min but i have to look i think in datasheet
NascentOxygen