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OPPO HA-2 Portable Headphone Amplifier/DAC Discussion Thread - Page 59

post #871 of 3970

For people looking into custom OTG (Android) cables that will not pull power from your smartphone for the HA-2:

 

Quote:

"The pull-up resistor on the OTG detection line is inside the HA-2. The cable needs to tie the detection line to ground. Please see the attached schematic of our OTG cable." - Oppo Customer Service

 

post #872 of 3970
Sent the SB-E5 back and ordered one of these, can't wait to get it!
post #873 of 3970
Quote:
Originally Posted by money4me247 View Post
 

For people looking into custom OTG (Android) cables that will not pull power from your smartphone for the HA-2:

 

 

 

 Great info. Thanks much! I think the TTVJ micro to micro 90 degree cable should work fine in light of this information.

I am pretty sure that it has to be OTG, as it is intended to connect the Glacier Amp/DAC to android devices.

Only curious thing is that they mentioned that it is directional.. (??)

Red end to the phone only ?

post #874 of 3970
Quote:
Originally Posted by mandrake50 View Post

 Great info. Thanks much! I think the TTVJ micro to micro 90 degree cable should work fine in light of this information.
I am pretty sure that it has to be OTG, as it is intended to connect the Glacier Amp/DAC to android devices.
Only curious thing is that they mentioned that it is directional.. (??)
Red end to the phone only ?

the ttvj cable is directional. it does have otg, but in order not to pull power from your smartphone you require that specific cable layout. the ttvj cable will work, but it may pull power from your phone.

i wld recommend checking out http://www.mimic-cables.com/products/custom-usb-cable. they can customize the cable exactly how you want it (length, connectors, otg, right/left angle, braid color). just have to email them.
post #875 of 3970


The pinout from the diagram is standard OTG. Pin 4 (sense) and 5 (ground) are tied together on both ends, this gives the OTG configuration regardless of which end is plugged into the phone.. Other than that It really looks like a standard USB OTG cable from their diagram. I begin to think the magic is in the circuit in the HA-2.

The only reason that I can think that the TTVJ cable would be "directional" is if only one end has pin 4 and 5 tied together. Maybe the Glacier DAC/AMP doesn't like these pins being tied together. This still gives the "sense" line to the phone so it will see that it has an OTG connection. (or so I believe)

 

Anyway, I ordered one. I will give it a try and let people here know what I find.

post #876 of 3970
Quote:
Originally Posted by mandrake50 View Post


The pinout from the diagram is standard OTG. Pin 4 (sense) and 5 (ground) are tied together on both ends, this gives the OTG configuration regardless of which end is plugged into the phone.. Other than that It really looks like a standard USB OTG cable from their diagram. I begin to think the magic is in the circuit in the HA-2.

The only reason that I can think that the TTVJ cable would be "directional" is if only one end has pin 4 and 5 tied together. Maybe the Glacier DAC/AMP doesn't like these pins being tied together. This still gives the "sense" line to the phone so it will see that it has an OTG connection. (or so I believe)

 

Anyway, I ordered one. I will give it a try and let people here know what I find.

ya, miceblue stated something along those lines.

 

let us know how it works out :)

post #877 of 3970
post #878 of 3970

Would these pair great with the Aurisonics Rockets iem (16 ohms)? I want to bring more out of my precious instead of buying a pair of over ear headphones that I will use less frequently than my iems.

post #879 of 3970
Quote:
Originally Posted by audiobot View Post
 

Would these pair great with the Aurisonics Rockets iem (16 ohms)? I want to bring more out of my precious instead of buying a pair of over ear headphones that I will use less frequently than my iems.

I get a bit of hiss on my IM-02, so if that annoys you, I probably would avoid this amp. I've found the HA-2 to be great for my overhead headphones, and therefore worth the purchase.

post #880 of 3970


Thanks for the reply mate.

post #881 of 3970

For Sony A15 users. This Chinese cable works!

 

post #882 of 3970
Quote:
Originally Posted by qsk78 View Post
 

For Sony A15 users. This Chinese cable works!

 

 

...and which one is it?

post #883 of 3970
Quote:
Originally Posted by ClieOS View Post
 

 

...and which one is it?

This one http://item.taobao.com/item.htm?id=42057594011

 

I was using it for the pha-3 instead of the original sony cable 

 

I have ordered it via these guys http://taobaofocus.com/

post #884 of 3970
Quote:
Originally Posted by qsk78 View Post
 

This one http://item.taobao.com/item.htm?id=42057594011

 

I was using it for the pha-3 instead of the original sony cable 

 

I have ordered it via these guys http://taobaofocus.com/

 

Are you saying it works on PHA-3 as well as HA-2? I can see why it is working on PHA-3 but not on the HA-2 since PHA-3 has the circuit of WMC-NWH10 built in, so just a regular OTG cable should work

post #885 of 3970
Quote:
Originally Posted by ClieOS View Post
 

 

Are you saying it works on PHA-3 as well as HA-2? I can see why it is working on PHA-3 but not on the HA-2 since PHA-3 has the circuit of WMC-NWH10 built in, so just a regular OTG cable should work

yes, it works on the OPPO as well

 

this is how the original pha-3 cable looks like (from the right side)

 


Edited by qsk78 - 4/14/15 at 9:35am
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