op amp question

Thread Starter

zbirdofparadise

Joined Nov 14, 2010
1
Hi all

so here is the question (i'm really n00b at this...)



and here is my working out

.. v3 is that pink dot i forgot to label.

(va - v0) / 10 000 + (va - v3) / 20000

then at v3
2 + (va-v3)/ 20000 = (v3-v0)10000 + v3/ 5000

whereby va= vb = 0

i got a really astronomical v0= 2.5 kV

seems wrong\, though my algebra is shoddy, i'm tiured.. and i sense that, that resistor is just a distraction?????? ahhhh
thank you
 
Top