Today I have 3d printed epsilons gun. I have seceded once again to not do a grey Dalek as I will be making a death to the daleks leader with all the quirks such as the shortened neck and the machine gun. Due to some problems with adhesion on my a1 3d printers bed the barrel of the gun got knocked off mid print so I’m currently printing the parts that are missing but for the most part the gun is done of course I still need to sand, paint and assemble the whole thing. Today i was planning to go to my local diy shop and purchase a sheet of hardboard to draw out the skirt pannels and holes for the hemis so I could take it back tomorrow and have it cut but alas in classic British tradition my plans were ruined by a thunder storm and some pretty heavy rain meaning that epsilon will have to remain in his gun and eyeball form for a few more days until I have a gap of good weather.

Thanks for that @bertus since the op amp will be using a single rail power supply. Maybe you can do a simple schematic if possible as my one is wrong. I  just tried watching a video on op amps and biasing with signle rail voltage it I got lost.   Thanks for your help,  

Hello,   The opamp can not go below 0 Volts. By lifting the input to half the powersupply, you have a lot of headroom for the audio signals. Use the line out of the audio board, as that has capacitors fitted.   Bertus

Thanks, why do we need to half the input signal as the op amp like this has a gain of 1 so it should have the same voltage out or am I missing something ? Sorry for my inability to do analog electronics, it is something I wish I had learnt earlier in life but got hooked by digital electronics.