PowerPad and the ultra extreme headphone amp TPA

[thomas997]

I just soldered the bottom to a solid copper wire and used it to attach to the perf board.

Chip didnt get hot at all.. maybe it depends on how you run it though.

Had a single 9V supply (wall transformer), and it seemed to clip if I turned my mp3 player to moderate levels..

Used the -2V gain setup..

[peranders]

My questions have been answered here
http://focus.ti.com/lit/ug/slou169/slou169.pdf

Thomas how much offset voltage did you get? Some values are mentioned in the document above but there are no figures in the datasheet (yet).

Do you like it? Does it deliver a "crisp" (according to TI) sound?

[carlosfm]

P-A, I have news that this chip is really good.
It's on my list to try soon, after holidays.

[carlmart]

If this chip is as good as Pavel Dudek suggests, even better than the AD815, then it might be interesting to try it as a line preamp or a buffer.

Soldering is not that easy though.


Carlos

[carlosfm]

Originally posted by carlmart
If this chip is as good as Pavel Dudek suggests, even better than the AD815, then it might be interesting to try it as a line preamp or a buffer.
Carlos

That's how I'm going to try.
As a preamp.

[peranders]

Carlos, beware of the rather high input bias currents. The seems to be 10 uA!

[thomas997]

Originally posted by peranders
Thomas how much offset voltage did you get? Some values are mentioned in the document above but there are no figures in the datasheet (yet).

Do you like it? Does it deliver a "crisp" (according to TI) sound?

I like it but its not quite powerful enough for my needs.

One measures .10V, the other I guess wrecked it somehow and it measures 1.2V

Didnt really spend a lot of time on them, so there was a bit of interference, but it was very quiet.

Sound was good as far as I could tell..

[carlosfm]

Originally posted by thomas997
Had a single 9V supply (wall transformer), and it seemed to clip if I turned my mp3 player to moderate levels..
Used the -2V gain setup..

Originally posted by thomas997
I like it but its not quite powerful enough for my needs.

With a single 9V PSU...
2x gain testing with a portable (usually low output) device, not enough...

[peranders]

I'm checking the market for a TPA6120 headphone amp. I will build it myself regardsless of the interst.

http://www4.head-fi.org/forums/showthread.php?t=82139

I'll guess the time schedule is October, November.

Warning: This TPA6120 is nothing for a newbeginner I'm afraid but I may help you to solder just this one.

[peranders]

Originally posted by peranders
My questions have been answered here
http://focus.ti.com/lit/ug/slou169/slou169.pdf

I sent a message to TI and a real person called me! Very nice that they pay attention, not like Infineon, nobody at home and when someone answers the telephone everybody else are out...like gone fishing.