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Class D Switching Power Amplifiers and Power D/A conversion

TI TPA3100D2, Amazing Class D Amp
TI TPA3100D2, Amazing Class D Amp
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Old 7th September 2012, 04:19 PM   #81
kp93300 is offline kp93300  Malaysia
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Hi Keith,
Have been evaluating the board for the last few hours .
There is a definite improvement in the low bass . My speaker has active woofer reaching down to about 30 Hz. Bass has good control and extension.
High also gain refinement.
THe amp has very little character of its own.
kp93300
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Old 7th September 2012, 06:44 PM   #82
rsavas is offline rsavas  Canada
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Default TPA3100D2 application in portable radio/MP3 player

Hello folks,

I used his part on a portable radio/MP3 player I made last year. I have nothing but praise for this part. I am using a 12V DC wall-wart and my 4-ohm Dynaudio Gemini speakers, the sound is fantastic, to me at least. I can crank it up and it is loud enough to fill a small room & runs cool as a cucumber ( got lots of them this year :-)
I do not have dog's ears', so I am not an expert listeners, as others claim to be on this site, but this is my opinion, none the less.
Nice to see others have used this part, as well and have good reviews.
See attached PCB of the portable stereo, enjoy!!

Regards
Rick
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File Type: jpg image001.jpg (330.3 KB, 757 views)

Last edited by rsavas; 7th September 2012 at 07:03 PM. Reason: Wrote wrong part number in subject
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Old 12th September 2012, 08:26 PM   #83
gilesw is offline gilesw
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Might not be of interest to you guys but I took some shots of the internals of the tbi:-

https://plus.google.com/photos/11599...COqqr4HmqtOUcQ
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Old 12th September 2012, 11:12 PM   #84
theAnonymous1 is offline theAnonymous1  United States
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Quote:
Originally Posted by gilesw View Post
Might not be of interest to you guys but I took some shots of the internals of the tbi:-
Are you kidding me? You can't be serious.....

You know I kind of felt bad for bashing the TBI after I seemed to upset a few people, but now I think I was being too kind. That looks like the inside of a $50 amp, not a $500 one.
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Old 13th September 2012, 12:05 AM   #85
rsavas is offline rsavas  Canada
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We are talking audio here, I have seen people pay a lot more for a lot less!!
Really now, what does anyone own for $50.00 that has any audio use, that ain't royal imported junk?

Parts cost for the amp section of my portable design was probably around $25-30, excluding power. So, I can do it cheaper than TI/Digi-Key can, big deal!!
If I were to re-layout the design again I'd probably use the TPA3116 or TPA3118 parts, as they are the next generation and look cheaper, for what ever reason. TI have a three part solution in the same footprint, very smart!!
Something on my board is interfering with "AM" so I have to do some shielding.
The AM avoidance feature is interesting.
These parts are great for little portable applications, like mine, and half decent/low cost entertainment units, they sound good and are energy efficient. Probably every TV made, these days, use these sort of parts. Look out, one day the US DOE may outlaw all inefficient audio amps, to save on a few coal fired generating stations, stay tuned!!

Regards
Rick
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Old 13th September 2012, 12:34 AM   #86
kp93300 is offline kp93300  Malaysia
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Quote:
Originally Posted by gilesw View Post
Might not be of interest to you guys but I took some shots of the internals of the tbi:-

https://plus.google.com/photos/11599...COqqr4HmqtOUcQ
Thanks for the photo.

The evaluation board uses Pana FC 220 UF power supply caps. I have paralled a 1000UF cap on the underside of the board and bass is much improved,
kp93300
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Old 13th September 2012, 12:57 AM   #87
gilesw is offline gilesw
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Heya kp,

All the ones on the tbi seem to be jamicon, 1 on the separate board is 35v 470uf with 2 on the main board.

The rest on the main board are 2 .47 50v near the minijack in. 2 10uf 25v and 2 100uf 25v.

Any ideas which ones I could replace?
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Old 13th September 2012, 01:17 AM   #88
rsavas is offline rsavas  Canada
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I am using a 12V/1500mA Walwart and on the pcb I have one 4700uF/35V VZ Nichicon, then two of 220uF/35V Silmic II Elna, one per channel!! Good choice it seems.
I have not tried this configuration with my 15" sealed speaker units yet. The amp is not intended to drive 15" bass units. A bridged configuration would be preferred in this regard, then beef up the reserve capacity some more.
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Old 13th September 2012, 01:26 AM   #89
kp93300 is offline kp93300  Malaysia
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Please see the schematic attached.
I soldered 1000Uf 25 V caps on the underside of C21 and c22. These are the caps powering the chip. I bypasses with small value film cap also.
On your tbi board you have to traced the location of this power supply caps it from the pins of the chip. It is most likely the 470 UF caps.
Suggest Pana Fc caps .

The mod not only improved the bass but also microdynamic aspect of the vocal. The subtle change in volume for each phrase. The decay in piano music is very good.

regards

kp93300
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File Type: jpeg eval board schematic.jpeg (90.1 KB, 657 views)
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Old 13th September 2012, 01:46 AM   #90
gilesw is offline gilesw
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hmm there are 4 round dark gray parts near the chip that I failed to mention, with 330 07489 on the top. They look just like the ones in the photo of the eval board but arranged in a different way. Are these caps too? They look like they are feeding the same pins as c21 c22.
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