Is single ended output possible from TDA7052 1W audio amp?

You don't need a transformer, just a small capacitor (1 to 10 uF would be OK) and resistor around 10K ohms (up to 100K would be OK) preferably the same values for both channels. Use output 1 only to the '+' terminal of one of the caps. Other end of the cap is the output. Connect the resistor to the output and ground. That goes to your line in. What you're doing here is ignoring the '-' phase of the output and using only the '+' with a DC blocking cap and a resistor to provide a charging path for the cap. This way it won't make a pop when you plug into the computer. This stunt is done very often when connecting a balanced audio source to a consumer unbalanced input though the cap and resistor isn't needed because there is no DC to deal with. You lose 6 db from reference level which is about right for consumer gear. GG