[Ynze] found a basic design that works, and built from there. One of the interesting things about [Ynze’s] amp, as well as many of the Gainclones, is the fact that they use no circuit board.

The whole circuit is still a single-ended one, but it has become a high-bandwidth amplifier with an ultra-low-noise DC performance. A basic auto-zero amplifier, from Maxim Integrated app note 4179.