For the circuit shown i Fig 4b, assume ?=100.i) Find Thevenin's equivalent voltage VTH and resistance RTH for base circuitii) Determine ICQ and VCEQ

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written 3.0 years ago by

teamques10 ★ 65k

modified 2.2 years ago by

sagarkolekar ★ 11k

$V_{th}=V_{cc}\dfrac{R_2}{R_1+R_2}=20\dfrac{370}{70}=105.71V$

$R_{th}=\dfrac{R_1R_2}{R_1+R_2}=\dfrac{21000}{370}=56.756\Omega$

For the purpose of bias stabilisation we have the Collector Current given by the equation

$I_{{c}_Q}=\beta I_b$

$I_b=\dfrac{V_{th}-V_{BE}}{{R_{th}+(\beta+1)R_E}}=\dfrac{{108.7}-{0.7}}{{{56.756}+505000}}=\dfrac{108}{505056.756}=2.13mA$

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