Hi Prabakaran!
Thank you very much for your answer! The circuit diagram does not clearly state whether the power LED is connected to the 6th pin, so that was very helpful.
I still can't get it to work though, and I don't know where the problem lies. I have used 5k potentiometers instead of 10k, so that could contribute to it, but I doubt it. I have no clue if it is the soldering, a broken component or just an error in circuit building. Guess I'll keep working on it..
– Bob