As [Jan-Erik] had already built a simple USB connected Digital-to-Analog Converter (DAC), he decided to make ... audio operational amplifier The on-board +3.3V and -5V voltages are generated ...

that fits within a slightly elongated 3.5 mm jack cover as part of a small USB-to-headphone cable. The DAC is an off-the-shelf board featuring an ALC4042 IC, it has a line-level output and a handy ...

This EarMen Sparrow review is looking a truly tiny little USB-C DAC/headphone amplifier. It’s designed to take away all the arduous digital-to-analogue conversion your digital audio files need ...