The author recounts their struggle to find a satisfactory way to listen to music with high-quality headphones. They tried various solutions, including using their phone, a portable CD player, and an old laptop, but encountered issues such as sound explosions, hissing, and poor sound quality. Frustrated by the lack of options, the author decided to build their own circuit using a soldering iron. They explain the technical details of the circuit and express their dissatisfaction with Apple, emphasizing their preference for free software. Finally, they share pictures of the completed circuit and their thoughts on battery life and a clever indicator LED.
https://www.naughtycomputer.uk/do_i_really_need_to_get_out_the_soldering_iron_again.html