Ultra high performance headphone amplifier QRV09

peranders · 01:52 PM

I have designed a TPA6120 based headphone amplifier. As input buffer I have chosen the expensive precision opamp AD8610 as input buffer.

Datasheets for the TPA6120a says:
0.000021% distortion
1300 v/us slew rate
2 uV noise
126 dB S/N
0 Hz- 160 MHz!!
700 mA out!!

The smallest parts are 0805 so it's not so hard to solder.

The input capacitor is made of PPS Metallized Polyphenylene Sulfide which is a heavy duty part for the automotive industry.

The documentation is 3 MB so it isn't possible to upload it here but send me an email and you'll get it from me. Notice, an EMAIL, not a personal message since you don't have your email address there.

peranders · 5th March 2011, 01:48 PM

I might consider a group buy if the interest is there.

BTW: How does it sound?

It's extremely clear, razor sharp, and it's not suitable for bad mp3 files since the amp will reveal every artifact in the music and recording. I think the guys over at head-fi.org can come up with better words. I'm pleased.

cobretti · 5th March 2011, 04:22 PM

What's the difference between 07 and 09?

cobretti · 5th March 2011, 04:29 PM

oh..BTW, the sound is really superb....

peranders · 08:42 PM

Quote:

Originally Posted by cobretti

What's the difference between 07 and 09?

I think you can see the difference besides a tuned pcb pattern. The pcb is 100 x 160 mm and will fit in many cases.

peranders · 5th March 2011, 09:11 PM

Quote:

Originally Posted by cobretti

oh..BTW, the sound is really superb....

... and your soldering looks very good also.

cobretti · 5th March 2011, 10:28 PM

Thanks. This was my first SMD project, I learn as I go.. Few more of these and I can do brain surgery too

c12mech · 7th March 2011, 04:38 PM

I am in for at least one pcb maybe more. With minimum order requirements for some of the parts I should have almost enough for 2 boards.

cobretti,
can you give me a p/n or link to those transformers. I found these at mouser and am hoping they will work.
030-7330-0 Pulse Audio & Signal Transformers

Thanks,
Bryant

peranders · 7th March 2011, 06:26 PM

The suggested transformer seems to fit.

The answer about the coupling cap at the input: The footprint is for a 2220, a PPS Metallized Polyphenylene Sulfide cap from RIFA. The Farnell article number in my BOM goes to a 1210 cap with PEN dielectricum. Farnell hasn't got any PPS caps.

goldkenn · 7th March 2011, 07:00 PM

If group buy, please consider also offerring the PPS cap, it is really hard to find.

5th March 2011, 01:48 PM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	I might consider a group buy if the interest is there. BTW: How does it sound? It's extremely clear, razor sharp, and it's not suitable for bad mp3 files since the amp will reveal every artifact in the music and recording. I think the guys over at head-fi.org can come up with better words. I'm pleased. __________________ /Per-Anders (my first name) or P-A as my friends call me

7th March 2011, 06:26 PM	#9
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	The suggested transformer seems to fit. The answer about the coupling cap at the input: The footprint is for a 2220, a PPS Metallized Polyphenylene Sulfide cap from RIFA. The Farnell article number in my BOM goes to a 1210 cap with PEN dielectricum. Farnell hasn't got any PPS caps. __________________ /Per-Anders (my first name) or P-A as my friends call me

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5th March 2011, 04:29 PM	#4
cobretti diyAudio Member Join Date: Feb 2011 Location: Taxachusetts	oh..BTW, the sound is really superb....

5th March 2011, 10:28 PM	#7
cobretti diyAudio Member Join Date: Feb 2011 Location: Taxachusetts	Thanks. This was my first SMD project, I learn as I go.. Few more of these and I can do brain surgery too

7th March 2011, 04:38 PM	#8
c12mech diyAudio Member Join Date: Jun 2009 Location: GTMO	I am in for at least one pcb maybe more. With minimum order requirements for some of the parts I should have almost enough for 2 boards. cobretti, can you give me a p/n or link to those transformers. I found these at mouser and am hoping they will work. 030-7330-0 Pulse Audio & Signal Transformers Thanks, Bryant

7th March 2011, 07:00 PM	#10
goldkenn diyAudio Member Join Date: May 2005 Location: HK	If group buy, please consider also offerring the PPS cap, it is really hard to find.

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