National LME49600 Reference Design Project

[Jarno]

So, why were the files removed?

[peranders]

Which files?

[stridervvv]

My DIY AMP - National Amplifier Schematic (LME49720+LME49600)
photo:


Distorsion test on my EMU1212 gives very low THD & IMD.
AMP used as portable.
With my Beyerdynamic DT990 PRO's sounds very cool!

Sorry for bad English...

[ethanolson]

Originally Posted by Jarno

So, why were the files removed?

If you're referring to the National website files, it's because TI has bought them and has recently moved the documents over to their website.

If you're referring to other files, then I have no idea.

[Jarno]

The ones ZDR posted.

[zdr]

There was an error in the schematics, so I asked to remove the files. Here are the corrected ones, but still did not have time to test them - I already etched and completed the boards with the erroneous ones.

[Yangoran]

@zdr
How do you think that this will measure compared to "The Wire"?

[zdr]

I have no idea - I just designed the pcb based on reference TI design. Output offset is at 1.5mV on both channels.

Mine is assembled now and it works

[dirkwright]

So, do you find that 6dB is too much gain? Given that most headphones are plenty loud @ 1Vrms input, and that a typical CD play puts out up to 2V, then I would think that a buffer is all that is needed for a decent headphone amp.

[dirkwright]

Also, the LME49600 is just a diamond buffer with a couple of bells and whistles. It would be more fun to me to try to outperform their chip by designing our own discrete version.