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Class D Switching Power Amplifiers and Power D/A conversion

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Old 30th March 2013, 01:29 PM   #151
DUG is offline DUG  Canada
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Looks good.

Well done.
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Old 30th March 2013, 01:43 PM   #152
xrk971 is offline xrk971  United States
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Thanks for all your help Dug. You led us all down this path by being the first to run it with your own pcb. It really is a simple circuit and your design is fantastic. It sounds wonderful. I shake my head when I listen to it and look at it, I just marvel at the technology that has let TI put the equivalent of a 20 lb rackmount amp from 20 years ago into something the size of credit card.. It is so small and the sound is so big, deep, wide, spacious, open, .... clear. I love this amp!
Thanks again for the help and the inspiration!
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Old 30th March 2013, 03:12 PM   #153
Lo_Tse is offline Lo_Tse  Canada
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Originally Posted by xrk971 View Post
Yep that solder bridge was the problem. I had to take an xacto knife to break it - solder wick could not remove it. Powered it up and it works like a champ. It sounds great. So far I can't tell the difference between this and the 3118 without taking the volume up. It's night time so the extreme volume would not be very good to try out now. I owe a Big Thanks to Dug for his help and providing the PCB.
Hey, it looks good (a lot better than the foam board one )! I am glad you like the sound. So all the effort putting into it are worthwhile. You are making me craving for it!!

Regards,
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Old 30th March 2013, 03:36 PM   #154
xrk971 is offline xrk971  United States
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Lo Tse,
It's all worth it. Great sounding amp. What's interesting is that the foam core version is just as quiet and sounds just as good as the PCB. Just not robust. I highly recommend both of these amps, you can't go wrong. As a DIY it is very cost effective.
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Old 30th March 2013, 06:31 PM   #155
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Originally Posted by xrk971 View Post
Lo Tse,
It's all worth it. Great sounding amp. What's interesting is that the foam core version is just as quiet and sounds just as good as the PCB. Just not robust. I highly recommend both of these amps, you can't go wrong. As a DIY it is very cost effective.
My 71 year old eyes and thumbs would have difficulty assembling this tiny stuff - SMD's, etc.

I will sure be looking for the availability of an assembled board on these amps.

Cheers,
Rod
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Old 30th March 2013, 09:27 PM   #156
Lo_Tse is offline Lo_Tse  Canada
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Originally Posted by nwboater View Post
My 71 year old eyes and thumbs would have difficulty assembling this tiny stuff - SMD's, etc.

I will sure be looking for the availability of an assembled board on these amps.

Cheers,
Rod
nmboater,

That is my problem too. My right eye's vision is below normal, I can handle through hole components without issue. However, tiny SMD's could likley cause me problem and frustration.

Regards,
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Old 30th March 2013, 09:47 PM   #157
rsavas is offline rsavas  Canada
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Default TPA3116D2 is a Success!

xrk971, Now that's a prototype to be proud of next step pcb layout & fab
Cheers
Rick
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Old 30th March 2013, 11:02 PM   #158
xrk971 is offline xrk971  United States
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Originally Posted by Lo_Tse View Post
nmboater,

That is my problem too. My right eye's vision is below normal, I can handle through hole components without issue. However, tiny SMD's could likley cause me problem and frustration.

Regards,
I don't have very good vision either but the magnifying binocular headband goggles are critical to doing SMD soldering - probably just as important as a good pair of tweezers (Swiss made stainless) and a good soldering iron. Before the goggles the parts looked like fleas or bits of dust and grit. With goggles, you can read the ohm ratings on the resistors and the parts resemble thru hole component sizes. The technique is totally different though. One thing that is different with SMD soldering is that you use a small tray to place your parts that you will immediately solder and you solder them. They don't come from a bin and you don't put them back. You remove each from a tape sealed reel strip one by one. Whatever you open from the reel strips you use. Otherwise you will mix up components and many like caps are not labled. I know it seems daunting but it is not that bad.
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Old 30th March 2013, 11:05 PM   #159
xrk971 is offline xrk971  United States
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Originally Posted by rsavas View Post
xrk971, Now that's a prototype to be proud of next step pcb layout & fab
Cheers
Rick

Thanks Rick. I have downloaded Eagle and identified Itead to do boards at $10 for 10. How can you beat that? Just need to find time. I want to make the TPA3116 into a tiny board, as small as I can possibly go.
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Old 31st March 2013, 02:19 AM   #160
radhaz is offline radhaz  United States
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Originally Posted by nwboater View Post
My 71 year old eyes and thumbs would have difficulty assembling this tiny stuff - SMD's, etc.

I will sure be looking for the availability of an assembled board on these amps.

Cheers,
Rod
At work, I use a stereo zoom microscope for SMD work. Cheap used ones can be had for under $100 at you-know-where
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