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Old 16th August 2013, 01:39 PM   #231
rsavas is offline rsavas  Canada
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I have heard that a transformer as a I/V sounds great, something to try out. Nothing wrong with experimenting.

IIRC, TPA3110 low F response is also a function of gain. I use min gain setting and make up the gain in the pre-stage. Maybe this is why you use 10u?

Something I should do in my setup menu, to select TPA3110 gain settings and listen for a diff. I do it for the MAX9729ETI- 3 channel audio selector, volume control, headphone amp.
Have fun

Last edited by rsavas; 16th August 2013 at 01:42 PM.
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Old 26th September 2013, 10:51 AM   #232
xrk971 is offline xrk971  United States
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I just received my Sure 3110 board from Parts Express. The thing is tiny and amazingly sounds very good powered by 12v 2amp SMPS wall wart from the Lepai T2020. I am very impressed by the minimal components used (no output inductors!) and the nice and convenient screw terminals for power input and speaker output. Nice thru hole solder pads are available for audio input direct connection if you want to bypass the 3.5mm jack. The input gain is good too as I am able to drive it with usual sources and not need a preamp. Very happy with it and for $10 the value is there. The sound is similar to the very nice 3116 but with less power.
What are good mods to try with this board? Upgrade main power rail electrolytic?
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Old 26th September 2013, 07:58 PM   #233
nesha is offline nesha  Serbia
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A friend of mine tried 3110 with 12V car battery and reported significant improvement in sound, but felt its power inadequate for his 12" Sonido+CDwaveguded bass reflex...
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Old 26th September 2013, 08:01 PM   #234
nesha is offline nesha  Serbia
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On the other hand, this little credit-card-amp has all the power my BetsyK will ever need!
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Old 26th September 2013, 11:55 PM   #235
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Quote:
Originally Posted by xrk971 View Post
...
What are good mods to try with this board? Upgrade main power rail electrolytic?
Yep, do the PS caps. I've tried Pan FM 470 uf/25V, Pan HFQ 1000uf / 25V and Pan FC 2200 uf/ 25V (for bass feeding a pro 15" through a 10mH coil!)

I grounded the gain pad under R4 on one of mine but just moved R4 on another to lower the gain to 20dB (looks like you can ground it or leave it floating as mentioned in the TPA31XX datasheet)

TPA31XX gain.JPG

TPA3118D2 Evaluation Module - TPA3118D2EVM - TI Tool Folder


Next will be C1 and C2 (L+, L- input caps) and C10 and C11 (R+, R- input caps)

Last edited by AudioLapDance; 27th September 2013 at 12:08 AM.
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Old 6th October 2013, 05:36 PM   #236
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I've just assembled a basic power amp with the Sure TPA3110D2 board, using an external medical grade 100W 12V smps. I removed the input coupling caps from the board (C1, C2, C10 & C11) and wired the + & - connections for each channel directly to a pair of ungrounded XLR input sockets.

I'm driving the amp from the balanced outputs of my Music First Classic v2 with ground lift engaged (so the transformer output is floating). Sounds very nice so far. Less weighty perhaps than the ACA it replaced but possibly more dynamic. Clean and smooth. Less obviously class-d than the tripath amps I've used before. The TDA3110D2 with 12V PSU is powerful enough for my Tannoy Little Reds at normal volumes.
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Old 12th October 2013, 12:18 PM   #237
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I've just bought an arcam avr360 that has pre outs for the front speakers. Could I use that to power the millenia?

Last edited by gilesw; 12th October 2013 at 12:24 PM.
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Old 22nd October 2013, 10:30 PM   #238
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Hey everyone,

I am late to this post. I'm having trouble with a TPA3123 amp. Very similar, or identical to these ones on eBay:

http://www.ebay.com/itm/TPA3123-Clas...item338678cf52

I got my $11 or whatever refunded from the seller, but still out of curiosity and sheer Welsh stubbornness I'd like to get this going.

Trouble is this: it distorts, but usually only piano sounds. Other than that, sounds wonderful. And of course it's intermittent.

I re-flowed every solder joint I could think of, but no change.

Any thoughts on what to do? Possible swap out certain capacitors. Most of the rest of the components are surface mounted devices and of course very difficult to mess with.

Mark

Last edited by Mark2727; 22nd October 2013 at 10:36 PM. Reason: complete my thought
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Old 22nd October 2013, 10:42 PM   #239
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Default Photo of the amp that distorts

Here's a photo of what I mean in the above post.

Mark
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Old 23rd October 2013, 06:01 PM   #240
MrSlim is offline MrSlim  Canada
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We'll need more details Mark, such as what are the PS voltages, how efficient are your speakers, etc..

Quote:
Originally Posted by Mark2727 View Post
Hey everyone,

I am late to this post. I'm having trouble with a TPA3123 amp. Very similar, or identical to these ones on eBay:

TPA3123 Class D Digital HiFi Mini Assembled Amplifier Board 25W 2 | eBay

I got my $11 or whatever refunded from the seller, but still out of curiosity and sheer Welsh stubbornness I'd like to get this going.

Trouble is this: it distorts, but usually only piano sounds. Other than that, sounds wonderful. And of course it's intermittent.

I re-flowed every solder joint I could think of, but no change.

Any thoughts on what to do? Possible swap out certain capacitors. Most of the rest of the components are surface mounted devices and of course very difficult to mess with.

Mark
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