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circuits not working sometimes

can someone explain to me why sometimes the program calculates the values ​​incorrectly, i.e. the amplifier output should be 4v but it shows nonsense, although dc sweep shows correctly.

below is the link to the circuit https://www.circuitlab.com/circuit/93q3x75atfue/wzmacniacz-z-zas-dziala/

by lasica
January 30, 2025

Is it possible that you have the polarity backwards on the op-amp? If I flip that amp vertically, DC simulation results in 4V rather than the negative number you are getting.

by stridermaverick
February 12, 2025
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