Hi,Yeah, i know. I have to use a voltage divider to get Half the supply voltage and then apply it to the opamps input. The other input then has to have a coupling capacitor, then it should work just fine. Another coupling capacitor has to be used At the output of the opamp to remove the dc Offset. I think, the higher the value for the decoupling capacitor, the more clean the dc supply voltage will get. But what value should be enough to decouple a 24v / 12v SMpsu voltage?
Thank you in advance
The old standard for digital logic was a 10uf in parallel with a 0.1uf.
However, it really depends on the current changes and the impedance of the power supply being used. You could need as high as 1000uf (low ESR) in parallel with 0.1uf.