IpsilonSound
100+ Head-Fier
- Joined
- Mar 22, 2004
- Posts
- 123
- Likes
- 10
I managed to reduce the THD to as low as 0.017% on my TDA1543-based DAC, but these harmonics are still troubling me. They are not random, as you can see, and for 1kHz tone additional 2, 3, 5, 7, 9, 11kHz tones are visible on the graph. Despite that, the sound is very very good after lots of optimization and meticulous part selection.
The i/v stage is still a passive one, I'm going to start working on an active one very soon.
Any idea what causes these harmonics, and if they will likely go away if I switch to active i/v stage, reduce the load on the output of the chip?