Reference Headphone Amp: TPA6120

zagisrule! · 17th February 2007, 02:46 AM

Hey guys,

Haven't posted much of my new stuff, so here is one of my last projects. It is a really nice headphone amp. The technical performance is the best I have ever seen in an audio device, the waveforms look so good! Balanced output is cool too, but the headphones need re-wiring.

I will have to post some scope screenshots sometime, without HP filter in place I can amplify orders of magnitude higher frequencies than audio nicely! Just a nice chip for more than audio.

I have regulated supplies +/- 15V supplies, with inductive LP filtering on power input and regulated output. Nice low-ESR power stiffening, Elna Silmic 2 on the input. Thin film 0.5% low noise resistors thoughout, and OPA2134 op-amps (x2 per channel).

You can see I use mono-bloc style construction with seperate PS and PCB for each channel. I have BNC connectors for input and output, and a stepped attenuator using a piano-dip switch.

I can post the PCB if anyone is interested.

-Matt

zagisrule! · 17th February 2007, 02:48 AM

New camera, I tried to get artistic but I need some more time

zagisrule! · 17th February 2007, 02:49 AM

more

zagisrule! · 17th February 2007, 02:50 AM

overall, little blurry

zagisrule! · 17th February 2007, 02:53 AM

an artful attempt

ppcblaster · 18th February 2007, 11:55 AM

I would have a difficult time with the SMT procedure,

can you post a schematic please? Did you build one without the

surface mount components to test the circuit?

Thank you........

zagisrule! · 19th February 2007, 12:15 AM

I can add a schematic if I get time to draw one later.

I winged it and just designed a PCB for this one, I made one small error though. I have already revised the PCB to correct it.

I didn't use through-hole because with the high-performance stuff there is no advantage to it. SMT soldering is a skill worth learning. There are superiour parts available in the SMT packages, and these are 0805, which are not that hard to solder anyway. Just a week ago I took two total soldering newbies through SMT assembly with a little kit I made for a class-D amp. By the end of the assembly they were suprisingly proficient.

-Matt

Nordic · 19th February 2007, 09:51 AM

yep, eagle files would be nice

ppcblaster · 19th February 2007, 11:54 AM

Perhaps a video we could download to teach SMT installation and

repair.

I have been told for three quarters the an SMT seminar was

comming to our school but it never happened and I graduate in

June.

Thank You.

zagisrule! · 21st February 2007, 05:09 PM

I use P-CAD but I can post gerbers.

There are several SMT tutorials on the web, might try a search?

-Matt

18th February 2007, 11:55 AM	#6
ppcblaster diyAudio Member Join Date: Jul 2006	Please post PCB and parts list I would have a difficult time with the SMT procedure, can you post a schematic please? Did you build one without the surface mount components to test the circuit? Thank you........

19th February 2007, 11:54 AM	#9
ppcblaster diyAudio Member Join Date: Jul 2006	Would you consider a SMT tutorial Perhaps a video we could download to teach SMT installation and repair. I have been told for three quarters the an SMT seminar was comming to our school but it never happened and I graduate in June. Thank You.

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19th February 2007, 12:15 AM	#7
zagisrule! diyAudio Member Join Date: Apr 2004 Location: Edgewood, NM	I can add a schematic if I get time to draw one later. I winged it and just designed a PCB for this one, I made one small error though. I have already revised the PCB to correct it. I didn't use through-hole because with the high-performance stuff there is no advantage to it. SMT soldering is a skill worth learning. There are superiour parts available in the SMT packages, and these are 0805, which are not that hard to solder anyway. Just a week ago I took two total soldering newbies through SMT assembly with a little kit I made for a class-D amp. By the end of the assembly they were suprisingly proficient. -Matt

19th February 2007, 09:51 AM	#8
Nordic diyAudio Member Join Date: Sep 2005	yep, eagle files would be nice

21st February 2007, 05:09 PM	#10
zagisrule! diyAudio Member Join Date: Apr 2004 Location: Edgewood, NM	I use P-CAD but I can post gerbers. There are several SMT tutorials on the web, might try a search? -Matt