please help transistor amplifier

Jony130

So everything is OK

michael1978

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 wich 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

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

ah ok did you see the circuit was everything all right just type of transistor, wich 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