What I’d stumbled upon was a chopper amplifier, a slightly ungainly and long superseded solution to the problem of DC amplification from the days before ubiquitous integrated circuit op-amps.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

To make use of the versatility of op-amps we normally use them connected in negative feedback. When an amplifier is connected in negative feedback a fraction of the output voltage is returned back to ...

This pocket-sized headphone amplifier works with wired and wireless headphones and includes Qualcomm's flagship Bluetooth ...