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Sansа Clip Zip - Improve battery life

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404_user_not_found:
Successfully completed the runtime test. Amazing results. :o

Sansa Clip+ with a connected headphone sony mdr-zx300. Repeat track, flac -q8, stored in SD card, default settings.

16h 45m - with "improve_battery_life.patch" (Patch set 5) without lowering CVDD2.
29h 19m - with "improve_battery_life.patch" (Patch set 5) with applied CVDD2 (113 value).

Not sure about stable number of CVDD2 but for me 113 value in my old and new sansa clip+ plays normally on low demand FLAC without a delay in menu.

Mihail Zenkov:
Fantastic result!

Can you try rise CVDD1 to 20 (in patch it 19), set CVDD2 to 112 and check battery runtime again?

saratoga:
I've split out the audio changes:

http://gerrit.rockbox.org/1089

If this looks ok I can commit. 


----

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. 

Mihail Zenkov:

--- Quote from: saratoga on December 28, 2014, 02:41:10 PM ---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.

--- End quote ---
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.

saratoga:

--- Quote from: Mihail Zenkov on December 28, 2014, 03:48:33 PM ---
--- Quote from: saratoga on December 28, 2014, 02:41:10 PM ---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.

--- End quote ---
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.

--- End quote ---

The 0dB voltage should be referenced to some supply voltage, probably avdd1 or 2, or maybe something else.  But the difference will be small, maybe only 1 or 2 dB volume increase so it might be hard to notice without measuring.  I might try testing this when I get chance. 

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