![]() All essential analog modules are embedded in the chip, including dual DAC and earphone driver, ADC, microphone booster, PLL, regulator, and USB transceiver. In this device, a chip-on-board (COB) version of the controller (or its clone) is used, and in all probability, it’s the CM108, a 48-pin (LQFP) highly integrated single-chip USB audio solution. The inside electronics is surprisingly simple because the design is based on a USB audio controller chip by C-Media Electronics Inc. Above all, it’s a true plug-and-play (PnP) device for Windows PCs. Because the tiny device uses a USB port for power, an external power supply adapter is not required. ![]() This $1 product that I bought from Amazon is nothing but a USB sound card (integrated two-channel USB audio controller) with audio connectors. Let’s begin with the above photo of a cheap electronics gizmo that made me curious.
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