What I’d stumbled upon was a chopper amplifier, a slightly ungainly and long superseded solution to the problem of DC amplification from the days before ubiquitous integrated circuit op-amps.

The operational amplifier, or op amp, is one of the most basic building blocks used in analog circuits. Ever since single-chip op amps were introduced in the 1960s, thousands of different types ...

There's a TI TPA3255 amplifier chip, a TI OPA1611 op-amp, and a ESS ES9038Q2M DAC. These components are also featured in the WiiM Amp Pro, which is nearly twice the price of the Vibelink Amplifier ...