Tripath class-T class-D headphone amp? - Page 2

Quote:

Originally Posted by Zigis 

Keep in mind, Tripath T-amp's output are bridged.

This mean - both channel's output "-" terminals are not connected together, and not connected to ground too.

If you connect to T-amp's output standard phones, with both grounds connected together in jack, you burn Tripath chip immediately

How do you get around that?

Quote:

Originally Posted by Mad Max 

 

How do you get around that?

 

From datasheet:

http://www.datasheetcatalog.com/datasheets_pdf/T/A/2/0/TA2024.shtml

Quote:

Originally Posted by Mad Max 

 

How do you get around that?

 

The easiest way is to use balanced headphones.  This eliminates the common ground.  Nearly all dual-entry phones can easily be balanced by just replacing the TRS phone plug with either an XLR 4-pin connector or (2) XLR 3-pin connectors.  

I figured as much since the TRS is where the grounds join.

or you can use a TA2022 (50~100w per channel), it has common ground.

Not that you will need that kind of power. High power T-amps also have a relativly high  back ground noise.

There is a Sure power amp board (rated 25 WPC with usual strong Chinese tailwind) based on the TI TPA3123 that has common grounded outputs and can be used to drive standard headphones.  Though this is not, technically, a T-amp, it uses a similar topology and the quality of the output is similarly superb.  This amp board is about 45 x 85 mm form factor and is easily adapted to a simple plastic case.  This will run on any reasonable linear power supply between 12 and 30 VDC, including an old laptop power block.  I have one of these currently connected to a home-designed 30V 3A regulated power supply, which provides outstanding audio quality and a surprising amount of power.  The board is available from Parts Express for about $25.

If you can rewire your headphone transducers to isolate grounds, another really good inexpensive amp is the Lepai 2020 (about $22 from various sourced including Parts Express.  I am currently running a set of MB Quart (old, old) mid price phones with one of these, and the sound quality is as good as it gets.