That is a trap. I told you politely exactly where you are wrong and now you want to play a brigand. If I had been rude, you'd play a man of honour and take umbrage. I have no stomach for games.
I suggest you take part in a simple DIY project and perhaps learn the basic elements of D-A convertors. If you were any closer, I'd suggest you to apply for some classes in electrical engineering department (they are free and everyone is welcome) ,y colleague does at the University. Alternatively, you might want to find some articles online. They are also free and some deal with basic elementary thematic that should be simple enough for a non-professional. You might also like buying some sort of DIY kit and assemble your own convertor. Cheap ones can be had for less than 10 pounds. Those will be 8 bit convertors (kike the ones in your water heater) but should serve their purpose of introducing you to what everyone here calls a DAC.