Ultra high performance headphone amplifier QRV09

[peranders]

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]

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]

What's the difference between 07 and 09?

 

[cobretti]

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

 

[peranders]

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]

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

... and your soldering looks very good also.

 

[cobretti]

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

 

[c12mech]

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]

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]

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

 

[peranders]

I'm working on my wikipage here. Soon ready. EDIT: Ready now

 

[dfidler]

I'm interested in 2 pcbs

 

[c12mech]

Thanks Peranders.

I was hoping that would work, price is good too. I will make sure and look for PPS caps in 2220 size.

 

[cobretti]

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

Yes, I used exactly these transformers. It was kinda difficult to find them but I wasn't worried since the US is so big market

 

[cobretti]

Thanks Peranders.

I was hoping that would work, price is good too. I will make sure and look for PPS caps in 2220 size.

These caps are snap in type, you can use higher capacitance like I did.

 

[peranders]

Those caps are not snap-in. They are surface mounted.

 

[cobretti]

I know, I overlooked it. My bad.

 

[cobretti]

Thanks Peranders.

I was hoping that would work, price is good too. I will make sure and look for PPS caps in 2220 size.

Here: SMC5.7104J50J35TR12 Kemet SMD Film Capacitors

 

[peranders]

It seems to be the right one but I can't download the datasheet at the moment.

 

[c12mech]

Cool, that should finish out my bom. Now just waiting for a board.