Android phones and USB DACs - Page 114

I'm fairly new to testing external DACS with Android devices and can only suggest the usual ideas I've come across:

Does booting the Note 2 up while connected to the DAC via your OTG cable make any difference? What about connecting the DAC and Note 2 via a powered hub. Perhaps other people are using a different Note 2 firmware to yours? I'm not sure how quickly Sprint release updates compared to other network providers or whether others are using OEM models with custom ROMS instead.

If a powered hub does help, maybe you can cobble together a more streamlined portable setup like in the picture posted by DanBa above:

www.head-fi.org/t/595071/android-phones-and-usb-dacs/1680#post_9151414

Good luck
 

Just now tried to boot up the Note 2 after the DAC was already connected and powered on, still no luck.  I don't currently have a powered USB hub for testing.

I am curious about the phone's carrier for the folks that have had success with the E07k and Note 2.  There are plenty of people, James from Fiio included, that have had success.  Maybe they are all using similar versions of the phone and Sprint users are just SOL for the time being?

Regardless, I need a solution until the E18 arrives.  DanBa's big list doesn't list the E7 as being compatible with the Note 2, but he also says the following after listing out Note 2-compatible DACs:

Does anyone know if the E7 is a safer bet than the E07k?  Or...should I just go with the iBasso D-Zero?

Thanks again for your help.

I noticed this has been asked but no answer yet.

Does the Galaxy Note 2 work with the Schiit MODI?

I was looking at getting this but may go with a portable for now.

For a second question as there is a huge list of options and I'm new to all this.

Which would be a good option for driving Hifiman HE-400's or Mr Speaker Mad Dog with Alpha Pads

Thanks for the help

Quote:

Originally Posted by analogue 3 

I'm just wondering which Belkin hub you're using here? I've been advised to try different USB hubs in an effort to find one which provides clear digital audio signal out of tablet to Cambridge Audio DACMagic. Currently going direct from USB OTG to DAC via manufacturer (DAC's) provided USB cable results in a noisy audio signal. I figured your Belkin hub would be a good place to start auditioning for a working setup.

 

Will also be researching USB battery packs to provide power rather than relying on AC->DC adapter. I don't suppose anyone has an input on a 4 port USB Battery pack vs a 2 port USB Battery pack and whether the 4 port model is more likely to interfere with the digital audio signal going from the android device to the powered USB Hub to the USB DAC. Battery capacity, voltage, amps etc is identical for both models. For all I know the number of ports is irrelevant to electrical disturbance.

 

Thanks

My Belkin powered USB hub is the following:

http://www.amazon.com/Belkin-F5U404PBLK-USB-4-PORT-Mobile/dp/B002AESNUI/ref=pd_rhf_se_s_cp_3_EJAP

It was the smallest USB hub I found in the shop around the corner.

About electrical disturbance, a solution: USB Y cable?

http://www.ebay.com/sch/i.html?_trksid=p5197.m570.l1313&_nkw=usb+y+cable&_sacat=0&_from=R40

http://www.6moons.com/audioreviews/kingrex12/1.html

https://www.facebook.com/notes/ifi-audio/ifi-gemini-dual-headed-usb-cable/483148201720927

“What’s wrong with the current USB cable design for audio use?

Many cables combine power and data into a single cable, causing crosstalk between power and data.

iFi Solution:

The key of course is the “twin connection” design. It separates the signal ground from power ground and shields the signal and power connections from each other."

The most constant voltage-regulated USB battery pack?

http://www.6moons.com/audioreviews/kingrex9/2.html

"The battery supplies of the usual mobile equipment require a DC/DC converter to step up the required output voltage."

"Our U Power's two 3.7V cells net 7.4V power which gets stepped down to the 5V with a superior low-noise linear voltage regulator."

"A typical linear regulator diagram is shown in Figure 1-1. A pass transistor is controlled by an operational amplifier which compares the output voltage to a reference. As the output voltage drops, the op-amp increases drive to the pass element, which increases output voltage. Conversely, if the output rises above the desired set point, the op amp reduces drive. These corrections are performed continuously with the reaction time limited only by the speed of the op amp and output transistor loop."

http://www.micrel.com/_PDF/other/LDOBk.pdf

Quote:

Originally Posted by PNWwildcat 

 

Does anyone know if the E7 is a safer bet than the E07k?  Or...should I just go with the iBasso D-Zero?

 

Thanks again for your help.

There’s a 99.999% chance that a Galaxy Note 2 can interwork with the FiiO E7.

The following reviewer prefers the iBasso D-Zero:

http://www.headfonia.com/fiio-e7-meet-your-rival-the-ibasso-d-zero/

And a USB OTG cable is included in the box of the iBasso D-Zero.

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/1320#post_9044972

Quote:

Originally Posted by Sniper2075 

I noticed this has been asked but no answer yet.

 

Does the Galaxy Note 2 work with the Schiit MODI?

I was looking at getting this but may go with a portable for now.

There is no answer because nobody knows it.

Micro-A to Mini-B "Android USB OTG cable" from iBasso at £5:

http://www.head-fi.org/t/628374/samsung-galaxy-s3-to-dac-usb-micro-b-male-to-mini-b-male/45#post_9152990

Quote:

Originally Posted by DanBa 

Micro-A to Mini-B "Android USB OTG cable" from iBasso at £5:

http://www.head-fi.org/t/628374/samsung-galaxy-s3-to-dac-usb-micro-b-male-to-mini-b-male/45#post_9152990

 

 

Warning: Spoiler! (Click to show)

 

 

 

 

 

I NEED one of these. Will make my life a lot easier!

so like one of the guys said yesterday (topic keeps getting ignored)...how do you get hot plugging functionality working on a Nexus 7 (grouper (wifi))???  It works only if you reboot the device with the DAC plugged in.

I've tried on ParanoidAndroidROM, LiquidSmoothROM, and now Dirty Rootbox ROM with multiple kernels (M-Kernel, Motley, Timurs)

there was actually a link to a mod (that i have yet to try) that solves it on the last page

http://forum.xda-developers.com/showthread.php?s=67d6d18ebc93a1617203c54b76f87b5d&t=2029728

Quote:

Originally Posted by Swimsonny 

there was actually a link to a mod (that i have yet to try) that solves it on the last page

 

http://forum.xda-developers.com/showthread.php?s=67d6d18ebc93a1617203c54b76f87b5d&t=2029728

I know I post there under the same name (in that thread already mind you).  Already tried that. :(