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Old 5th March 2011, 02:28 PM   #1
Electrons are yellow and more is better!
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Default Ultra high performance headphone amplifier QRV09

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.
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Last edited by peranders; 5th March 2011 at 02:52 PM.
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Old 5th March 2011, 02:48 PM   #2
Electrons are yellow and more is better!
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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.
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Old 5th March 2011, 05:22 PM   #3
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What's the difference between 07 and 09?
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Old 5th March 2011, 05:29 PM   #4
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oh..BTW, the sound is really superb....
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Old 5th March 2011, 09:39 PM   #5
Electrons are yellow and more is better!
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Quote:
Originally Posted by cobretti View Post
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.
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Last edited by peranders; 5th March 2011 at 09:42 PM.
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Old 5th March 2011, 10:11 PM   #6
Electrons are yellow and more is better!
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Quote:
Originally Posted by cobretti View Post
oh..BTW, the sound is really superb....
... and your soldering looks very good also.
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Old 5th March 2011, 11:28 PM   #7
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Thanks. This was my first SMD project, I learn as I go.. Few more of these and I can do brain surgery too
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Old 7th March 2011, 05:38 PM   #8
c12mech is offline c12mech  United States
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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
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Old 7th March 2011, 07:26 PM   #9
Electrons are yellow and more is better!
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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.
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Old 7th March 2011, 08:00 PM   #10
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If group buy, please consider also offerring the PPS cap, it is really hard to find.
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