# A testing sorce for this circuit

1. Dec 3, 2009

### estu2

http://i48.tinypic.com/2je2omq.jpg

i need to find thevenin representation for this circuit
i found that $$V_{th}=I_3*7$$
all the sources are dependant so we need to connect a testing source of 1 volt and see what current comes out

but here i have step function
so it could be 0 or 1 depending on the time

i dont know how to do it here
and there are inductive components

which represents differential equations and stuff which has nothing to do with finding the current that flow threw it)