Author Topic: Transistor problems/practice  (Read 2197 times)

Offline FOOKz™

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Transistor problems/practice
« on: August 19, 2011, 11:32:01 AM »
Solve.

Re and RE are the same thing i was just lazy



[spoiler]
VBB = ( 10K / ( 56K + 10K )) * 24 = 3.6363
VBB = 3.6363

RTH = ( 56K-1 + 10K-1 )-1
RTH = 8.484K

IC = ( 3.6363 - 0.7 ) / 2.2K
IC = 1.33mA
[/spoiler]
« Last Edit: August 19, 2011, 05:49:29 PM by FOOKz™ »

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Offline FOOKz™

  • Hardware Modder
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  • E = MC² Mad Scientist
  • *
  • Posts: 2070
  • Post quality +37/-2
  • Electronics Expert Electrical Engineer
Re: Transistor problems/practice
« Reply #1 on: August 19, 2011, 05:41:14 PM »
More.




IB = ( VCC - V1 ) / RB

IC = (VCC - V2 ) / RC

hFE = IC / IB


[spoiler]
IB = (9v - 0.67v) / 330k = 25.2uA
IB = 25.2uA

IC = (9v - 5v) / 1k = 4mA
IC = 4mA

hFE = 4mA / 24.2uA = 159
hFE = 159
[/spoiler]
« Last Edit: August 19, 2011, 05:51:26 PM by FOOKz™ »

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