Question

how to find the value of transistor to making circuit ​

Answer 1

Answer:

Use the formula 

Ie = (Vbb - Vbe)/[Rb/(Beta + 1) + Re]

where Ie is the variable for the emittercurrent and Vbe is the base to emitter voltage

Set Vbe to 0.7 volts, which is the standard for most transistor circuits.

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