Hello, I am trying to calculate the working point of the transistor used in this common base circuit. Please see the this image: http://c213-100-21-126.swipnet.se/cb_part.jpg. The circuit is larger than just the common base part, but that's where I'm stuck at the moment. I've marked it with a red box. I am trying to make a "direct current scheme" of that part and then "split" it by the base and emitter part (at least I think that's what I should do). I don't really know how to treat the input signal when creating the direct current scheme, though. Could anyone help me with this part and maybe give tips on how to calculate the working point of the transistor? The symbols are European and the instruction text is in Swedish, but please ignore that R1, R2 etc are resistances, e(t) is the input signal, which is an ideal voltage source (sinus shaped AC). Thanks in advance!