The two CE equivalent circuits refer to the same transistor.

The two CE equivalent circuits refer to the same transistor. The value of R is given by:

From fig. (a) and (b)

i_b =	V₁	→ (a) and
	R

0.08 V₁ = 80 i_b

or 0.08 V₁ =	80
	V₁

or R =	80	= 1000 Ω
	0·08