Rockbox Ports are now being developed for various digital audio players!
Another thought: if changing the voltages is easy, I wonder if increasing the audio supply voltages at higher volume settings would enable higher volumes without decreasing battery life.
Quote from: saratoga on December 28, 2014, 02:41:10 PMAnother thought: if changing the voltages is easy, I wonder if increasing the audio supply voltages at higher volume settings would enable higher volumes without decreasing battery life. I measure many variants for audio voltages but can't get better result for volume/THD/power consumption. IMHO DAC limit output voltage and we can't influence on this.
Output stage based on op-amps. For change gain we should change negative feedback. If we rise supply voltage we don't have gain change. If we set voltage lower than op-amp have need, we have limit volume with huge distortion.
Another variant - get louder signal from DAC, but IMHO we get all possible from it (+6dB).
Thats true for a class AB amp, but do the class D amps in these devices work like that?
You can do this by increasing the gain in the mixer stage, but it simply distorts due to the limited rail voltage on the headphone amplifier.
Can you try rise CVDD1 to 20 (in patch it 19), set CVDD2 to 112 and check battery runtime again?
Updated builds:http://web.mit.edu/mgg6/www/rockbox-clipv2.7zhttp://web.mit.edu/mgg6/www/rockbox-clipplus.7z
saratoga:Can you check clip v2 without CVDD1 and CVDD2 mod? And without sd card.
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