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Old 17th February 2007, 03:46 AM   #1
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Default Reference Headphone Amp: TPA6120

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
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Old 17th February 2007, 03:48 AM   #2
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New camera, I tried to get artistic but I need some more time
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Old 17th February 2007, 03:49 AM   #3
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more
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Old 17th February 2007, 03:50 AM   #4
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overall, little blurry
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Old 17th February 2007, 03:53 AM   #5
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an artful attempt
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Old 18th February 2007, 12:55 PM   #6
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Default 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........
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Old 19th February 2007, 01:15 AM   #7
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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
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Old 19th February 2007, 10:51 AM   #8
Nordic is offline Nordic  South Africa
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yep, eagle files would be nice
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Old 19th February 2007, 12:54 PM   #9
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Default 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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Old 21st February 2007, 06:09 PM   #10
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I use P-CAD but I can post gerbers.


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





-Matt
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