tpa6120a2 headphone amplifier

[neutron7]

It looks like it could be used for a few things. first is to try using it instead of the usual OPA + BUF as an input buffer and some gain for some inverting 3886es, inverting because these actually prefer to drive a lower impedance.

the only trouble will be mounting it since i will make the boards (non plated VIAS) and i have no equipment for SMDs. fortunately this chip is not quite as tiny as some SMD (pin spacing) so is probably solderable.

i will try this totally non TI approved method:

1: make a clamp/heatsink from old VGA ramsinks. one end touches copper at the "dead" end of the chip

2: chip gos on opposite side of board from the rest of components (copper side)

3: put some heatsink compound under the chip and clamp it down

4: solder the pins.

[ljordan]

Do you think this chip could be biased into class a as is easly done with opamps?

The last one I did was a lm6172 using a resistor across the output to the neg. supply.


BTW
I did get the offset down to 30 -40 mv at good volume levels. Just feeding the tpa direct from the transformer. Using the 600 to 600 tamradio.I have the players (onboard the akm) attenu. setting on (-20db) and the filter set to sharp.

Lewis

[peranders]

Originally posted by neutron7
Is it safe to connect all the 10 NC pins to ground (and the powerpad)

Yes, it serves also as cooling. Have you read the datasheet? You have pretty much info there.

To answer your question, look at my picture.

[neutron7]

Peranders it looks like you soldered those by hand. i am looking at some SMD on a video card and i cant possibly imagine doing that!

do you have any tips, or is it just down to a steady hand.

[ljordan]

About class a bias for this chip and some of my other qusetions?
also

-getting the offset down w/o an input buffer chip?
-is the tpa the same item as the ths6012?
-with no buffer what would you choose for a r2 r1 combo(see prev image) that would have a gain of 5 to 10?

Thank you
Lewis

[Fixup]

Originally posted by weissi
Sorry for beeing a little bit o.T. forgive me :-)

I´ve built an amp with the THS6012 a while ago, it sounded nothing than superb... Last time surfing on the Analog hompage I read about the AD8397, a high current opamp with quite good but not that impressive spec´s as the Ti THS-type.
Anyway, I put it in the output/filter stage of my EMU0404 - as a line driver it can´t be bad I thought.
But: When I drive my K271s (and those AKG´s are known for their high demands on amplification to reproduce good low freq.)directly from the card, bypassing the THS, I can hear absolutely no difference - even with brain-damaging levels...

Anyone else tried this AD8397, especially for headphone amp? I love its sound, its 300mA R-R ouput to 32 ohm and low noise. Not very fast (53V/ns), but more than enough for audio.

[peranders]

Originally posted by neutron7
Peranders it looks like you soldered those by hand. i am looking at some SMD on a video card and i cant possibly imagine doing that!

do you have any tips, or is it just down to a steady hand.

The parts I have used aren't particulary hard to solder. Solder tips here:
http://41hz.com/Forums/topic.asp?TOPIC_ID=21

[sonichedgehog36]

I want to build some of these, partially for a school project, but I need some boards. Dakiller, could you post your Eagle file of this?

[whitelabrat]

I've got a bunch of these chips. It would be nice to have a pcb to work with, but I'm thinking I could solder the chip onto a heatsink and then point to point wire the rest for cheapness.

[Dxvideo]

Originally posted by Fixup


Anyone else tried this AD8397, especially for headphone amp? I love its sound, its 300mA R-R ouput to 32 ohm and low noise. Not very fast (53V/ns), but more than enough for audio.

I've purchased a couple of AD8397ARDZ and they must be here today... I am planning to use them as LPF for my USB DAC project.. This is the topic;
A Simple opamp question?
With this way; I am expecting to have a simple and headphone driveable USB DAC with really acceptable THD/Noise figure..

So do you say; it has really good sound?
And what about the heatsinking? A 1/4 euro board (100x40mm) with complete ground plane will enough for it?