Support and General Use > Hardware
[Clip+, Clip Zip, ClipV2, FuzeV2] Improve battery life, part 2
asymsucon:
johnb,
Do you have any experience with Transcend microSDXC cards in Sansa players? I'm about to get a new card, possibly compatible with this low-power mod :)
johnb:
The max size of Transcend I have is 32GB and atm I don't know in which device (camera, cell phone, dap) these are buried ...
I feel Sandisk is a good bet for larger cards. I will test a different Sandisk 128GB later ...
asymsucon:
--- Quote from: Mihail Zenkov on January 03, 2017, 06:56:21 AM ---
:) But it have external DAC and AMP so it should consume more. Probably it also can be optimized.
--- End quote ---
Of course, the power capabilities of X5II and X7 are nowhere near that of Clip+. X5II is rated 2.82Vrms and X7 4.12Vrms. However my point was that while this power is useful for indoor usage with full-sized circumaural headphones, on a portable player it's not as well utilized. Most people listen to IEMs or earbuds on the road, to which DAPs need to put just 1mW to reach dangerous listening levels. In that usecase, the overpowered X5II or X7 is nothing but a hand-warmer and powerhog, burning over 99.9% of consumed energy and only turn that measly 1mW into useable power that travels to the earbuds/IEMs.
Sansa players with their much lower quiescent consumption are thus more suitable for this application, as they can well deliver over 15mW into headphone sources and still consume only 50-60mW in total. :)
--- Quote from: asymsucon on January 02, 2017, 10:53:07 AM ---I will try measure it later. In any case - better have high volume with higher power consumption than unusable high volume with clipping and lower consumption.
--- End quote ---
Agree 100%.
asymsucon:
--- Quote from: johnb on January 03, 2017, 11:29:25 AM ---The max size of Transcend I have is 32GB and atm I don't know in which device (camera, cell phone, dap) these are buried ...
I feel Sandisk is a good bet for larger cards. I will test a different Sandisk 128GB later ...
--- End quote ---
I have only good experience with Transcend cards, but the largest one I have is 8GB. But I'd assume they could work better than Samsung or Sandisk.
Mihail Zenkov:
--- Quote from: johnb on January 03, 2017, 09:19:58 AM ---* still the same navigation issues with my Samsung EVO 64GB -> empty dirs
* different Samsung 64GB:
Startup and scanning disk takes long. I can play songs from SD. Resume playback after boot (on a flac file) -> starts to play, pauses, plays, pauses ...
--- End quote ---
Try new build with this cards: http://knk.square7.ch/cvdd2/rockbox-clip+-cvdd2_scaling-3.zip
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