The discussion revolves around an operational amplifier (op-amp) circuit, specifically questioning whether the voltage at node Vb is 0V. Participants are exploring the implications of this assumption in the context of nodal analysis and the properties of ideal op-amps.
Participants are actively engaging with the problem, sharing their equations and reasoning. Some guidance has been offered regarding the properties of the op-amp and the relationship between nodes f and c, but there is no explicit consensus on the value of Vb.
There is mention of imposed homework rules requiring proof of given answers for each node, which adds a layer of complexity to the discussion. Participants are also dealing with multiple unknowns in their equations, which may affect their ability to resolve the question of Vb.
Not quite, I am given the answers for each node and asked to prove that they are right, all of my proof uses the fact that Vb=0, but I don't know how to prove thatgneill said:
Then you need to analyze the circuit, starting by using the properties of the ideal op-amp. Start by finding the potential at its + input (node f).Cocoleia said:
I wrote all the equations for nodes b, c, d and f. Since we can see that Va=-5V and Ve=2v, from the drawing. I just end up with 3 eqns and 4 unknownsgneill said:
You'll have to show the details if you want help.Cocoleia said:
gneill said:
Ok so potential at f and c have to be the same ?gneill said:
Yes. So long as an op-amp circuit provides a negative feedback path, it must be so.Cocoleia said: