Problem

hgmjr

Joined Jan 28, 2005
9,029
Once you have reviewed the material contained in the link that Dave has posted, then give the calculation a whirl and then post your calculations and your results. We will be happy to provide you a bit of guidance if needed.

hgmjr
 

Thread Starter

Annu007

Joined Jun 12, 2006
11
I came up with 13K for R2.
Vo = 0.25ma * 5K +0.7V
Vo = 1.95V
I1= I2 + ID
I1 = 12V/30K =0.4mA
ID = 0.25mA (Given)
I2 = 0.4-0.25 =0.15mA
V0 = 1.95V
R2 = 1.95V/0.15mA = 13K
 

richbrune

Joined Oct 28, 2005
106
The part about 12v/30k doesn't look right; the voltage drop across the 30k can't be all of the 12v, it's got to be something less than that, seems like about 9 or 10 volts, because you've got to subtract the voltage drops caused by all of the 3 remaining components. I got 40678, but I don't have time to check it before I leave---Sorry, Rich
 
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