USB Digital to Analogue Converter with Headphone Amplifier - from LINDY UK
Apogee Electronics Groove - 24-Bit 192 kHz USB DAC and GROOVE
Amazon.com: eSynic Headphone Amplifier Portable Amp 3.5mm Gain Switch Audio Rechargeable HiFi Earphone Headphone Amplifier with 1.2m USB Cable and Lithium Battery for MP3 MP4 Phones Digital Players and Computers : Electronics
Nobsound Mini Hifi Sound Card Dac Tda1387 Usb 8x Audio Decoding Headphone Amplifier Dts/ac3 Coaxial Optical Digital Output - Headphone Amplifier - AliExpress