Timeline for Finding the resistors value in a transistor circuit that uses a constant current source
Current License: CC BY-SA 3.0
5 events
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| Apr 30, 2017 at 12:49 | vote | accept | elecV1 | ||
| Apr 30, 2017 at 12:40 | history | edited | Neil_UK | CC BY-SA 3.0 |
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| Apr 30, 2017 at 12:01 | comment | added | elecV1 | G36 thank you for your answer.Indeed BJT's are identical.Also beta=100,VBEon=0.7V,Vτ=25mV for all transistors..I think that VE1=0V,VB1=VC1=VE2=0.7V, VB2=VC2=VB3=1.4V and for calculate R5 I know that IR5 = (8-1.4 )/R5 and the only unknown variables is IR5.If I assume that IC3 = IR5 because of Q2,Q3 is current mirror then I can find the solution because IR5=400uA so R5 = (8-1.4 )/400uA.HoweverI am not sure for these thoughts. | |
| Apr 30, 2017 at 11:31 | history | edited | Neil_UK | CC BY-SA 3.0 |
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| Apr 30, 2017 at 11:19 | history | answered | Neil_UK | CC BY-SA 3.0 |