Saturday, March 30, 2019

Yet another Gainclone

This was probably inevitable.

A dual-mono LM3886 kit from ChipAmp.com (now gone), with Avel Lindberg transformers in a compact enclosure from Design Build Listen (still in business, but not in the business of making enclosures). I liked the simplicity, but not the sound.

That build started a longer line of exploration: how the implementation of otherwise straightforward op-amp circuits affects both measurable and audible performance.

That line of work eventually led to HiFiOcean.

What I would pay attention to now is not the chip itself, but:
  • grounding and system integration;
  • layout and PCB artwork; 
  • optimized feedback loop;
  • stability in a real build under various conditions, e.g. when clipping.
If you’re interested in how these aspects are handled in more recent designs:

The circuit here is simple. Making it behave well is not.