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PreconditionValue
Vcc12v
Vbb3.3v
NPN BC337
Vbe(sat)1.2v
Vce(sat)0.7v


Ic = 12v/155 = 78mA

Ib = Ic/10 = 78/10 = 7.8mA


Vb = 3.3v - Vbe(sat) = 3.3 - 1.2 = 2.1v

Rb = Vb/Ib = 2.1/0.0078 = 269 ohms


Tested with 220 ohms and it worked.