Nyame, I'd agree with Rick. It looks like you are measuring at the junction between the collector of the transistor and the bottom of the 8.3K resistor. If you measure after the 1000nF capacitor (ie where the right hand meter labelled "V" is" you should get a signal that's centred around ground.If you don't, it's possible the 1000nf capacitor has a short circuit, and is allowing the DC through to the output.A couple of other points....1. It's better to say "1uF" than "1000 nF" - you should try and keep values between 0.1 and 100. This may be something to do with your circuit drawing program, though.2. A circuit like this, while it works ok, may give problems due to transistors with different gains or changes in supply voltage. I'd suggest the following... change the 30K resistor to 33k (preferred value), change the 1.6K resistor to 3.3K, and put a resistor between the transistor emitter and ground of 1K, Also change the 8.3K resistor to 10K. Using preferred values will make it easier and cheaper to get your resistors. the gain of the circuit will now be around 10. If you want higher gain, put a 47uF capacitor across the 1K resistor.This will result in a much more stable circuit which will give repeatable results for different supply voltages and transistors with different gains. If a transistor has higher gain, it will tend to pass more current, which will raise the voltage on the new 1K resistor, which will lower the base-emitter voltage on the transistor and tend to reduce the current. Finally, you posted your question twice. This does happen, but if you look on the right or your comment you will see 3 dots. Click on them and you will be offered the opportunity to edit or delete the comment - you can use this to delete the second one.Good luck with your endeavours! Cheers // David