Tiefpass

http://everycircuit.com/circuit/5236874429333504

Put gnd

The circuit must have a ground, then it will work.

@Robert_KIDD, have you read and understand the previews comments?

@Hurz, just because you have tried to provide an answer to @padeiro's question does NOT mean other's cannot also try to help. @jorgehf offered advice too, why shouldn't he? Anyone glancing at this circuit can read my comment and know immediately that circuits must have a ground to work on the simulation OR they can follow your link and compare the two circuits to see what the difference is - which is easier and quicker?? This is not your forum and you are not God! It might be a good idea if you wound your neck in as there is a good chance that people will be put off by your attitude and be reluctant to contribute! However, that doesn't include me.

And its not your forum! Its not the first time you sound like a parrot.

Which is why I don't behave as if it is! You've shown your true colours now.

Wow

A useful comment at last.

Terra is not conected at this scope. Witout terraconect, the sope cant calc the simulation.