Because of the high gain and the input offset of the Opamp you will not be able to see significant change in input voltage when the output is 14V or 2.75V.At the moment I am getting 14 V. It should be 2.75 V
Why 2.75 V? Why not 5V or 0V? Do you have additional information not yet revealed in the thread? Again, the voltage is undetermined without additional circuit elements.At the moment I am getting 14 V. It should be 2.75 V according to the circuit documents. As you can see voltage at the R2 and R3 inputs are about zero. There is something wrong which causing this 14 V instead of 2.75 V.
With precise look at the documents it shows pin 2 voltage should be 0.0 and pin 3 voltage should be 0.1 v which is almost the same voltages I have measured. Also document shows with these inputs there should be 2.75 v at the output but we have 14 v. This shows we have a faulty parts here. Any advice how to proceed?
this question appeared in this thread
13.9 V instead of 2.75 v, Which parts are failing?
so my question is what are umsch1 and umsch2 connected to?
umsch1 is directly connected to the inverting input
unsch2 is connected to inverting input through a resistor
where is the adjustment you mention in post #6?
are you sure all of the components are correct?
what did you get when you simulated this circuit?
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