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For a common emitter amplifier , current gain is 70 . If the emitter is 8.8 mA , calculate the collector and base current . Also calculate current gain , when transistor is worked on common base amplifier . |
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Answer» SOLUTION :Data SUPPLIED , `beta = 70 , I_(E) = 8.8 mA , beta = (I_(C))/(I_(B))` `I_(C) = beta I_(B) = 70 xx I_B` `I_(E) = I_(C) + I_(B) = 70 I_(B) + I_(B)` `I_(B) = (8.8)/(71) = 0.124 mA` `I_(C) = beta I_(E) = 70 xx 0.124 = 8.68` mA `beta = (ALPHA)/(1 - alpha)` `70 = (alpha)/(1 - alpha)` `alpha = (70)/(71) = 0.986` |
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