TPA3110 and TPS3116 amps

TrungT · « **Reply #1280 on:** 8 Feb 2015, 11:38 pm »

^^^^^^
+1

rajacat · « **Reply #1281 on:** 10 Feb 2015, 10:30 pm »

Anybody know the input impedance of the TPA3116? I'm having trouble getting sufficient volume using my Tortuga LDR passive pre.

Anyone else using the 3116 with a passive pre?

matt_garman · « **Reply #1282 on:** 10 Feb 2015, 10:59 pm »

Quote from: rajacat on 10 Feb 2015, 10:30 pm

Anybody know the input impedance of the TPA3116? I'm having trouble getting sufficient volume using my Tortuga LDR passive pre.

It depends on the gain setting. See the table at the top of page 14 of the datasheet. That table is reproduced under the Gain Setting section of the tpa3116 wiki at DIYAudio.

From my experience, most tpa3116 boards seem to default to 26 dB gain setting which corresponds to an input impedance of 30k Ohms.

Hope that helps!

rajacat · « **Reply #1283 on:** 11 Feb 2015, 12:04 am »

Quote from: matt_garman on 10 Feb 2015, 10:59 pm

It depends on the gain setting. See the table at the top of page 14 of the datasheet. That table is reproduced under the Gain Setting section of the tpa3116 wiki at DIYAudio.

From my experience, most tpa3116 boards seem to default to 26 dB gain setting which corresponds to an input impedance of 30k Ohms.

Hope that helps!

Thanks for that. That 's starting to get into the tall grass. I guess there would be a way to change the gain but too small scale for me. My tube amp worked with the Tortuga but it's out of commision. Time for a new amp.

matt_garman · « **Reply #1284 on:** 11 Feb 2015, 03:20 am »

Quote from: rajacat on 11 Feb 2015, 12:04 am

Thanks for that. That 's starting to get into the tall grass. I guess there would be a way to change the gain but too small scale for me. My tube amp worked with the Tortuga but it's out of commision. Time for a new amp.

Do you know what tpa3116 board you have? If you have the Yuan Jing Blue/Black board ("YJBlue", Danzz design, see wiki mentioned above), then it is very easy to increase the gain (and decrease input impedance) if you can do basic soldering. Increasing gain to 32db/15kohm requires only one resistor to be changed. Upping to 36db/9kohm requires two resistors to be changed.

If this is something you think you might do, I'm happy to help with more detailed instructions. I will mention one caveat, though: I increased the gain to 32db on one of my YJBlue boards, and it caused a slight hiss to show up when no music was playing. It went away when any sounds were played, and was low enough that you had to be within inches of the speaker, but some folks may find this to be a deal-breaker. YMMV and all that.

rajacat · « **Reply #1285 on:** 11 Feb 2015, 07:04 am »

Quote from: matt_garman on 11 Feb 2015, 03:20 am

Do you know what tpa3116 board you have? If you have the Yuan Jing Blue/Black board ("YJBlue", Danzz design, see wiki mentioned above), then it is very easy to increase the gain (and decrease input impedance) if you can do basic soldering. Increasing gain to 32db/15kohm requires only one resistor to be changed. Upping to 36db/9kohm requires two resistors to be changed.

If this is something you think you might do, I'm happy to help with more detailed instructions. I will mention one caveat, though: I increased the gain to 32db on one of my YJBlue boards, and it caused a slight hiss to show up when no music was playing. It went away when any sounds were played, and was low enough that you had to be within inches of the speaker, but some folks may find this to be a deal-breaker. YMMV and all that.

Thanks for the offer of assistance.
I have the audiobah board. It's unmodified. I do have a soldering iron. I can live with a little hiss.

I still want to make sure that I haven't overlooked something when I assembled the Tortuga diy board. Also the input impedance of the Tortuga may be able to be adjusted so I need to figure that out and decide which way to go.

Regards,

Roy

Markvdv · « **Reply #1286 on:** 12 Feb 2015, 10:46 am »

audiobah/ac1308 inputimpedance probably below standard 30k and gain also little below 26dB, standard board, if I have time I look. (Signal has 10k to GND I remember so could be 7.5k inputimpedance????)
Inputimpedance setting Tortuga may affect outputimpedance LDR too, probably in manual, from what I read outputimpedance could be till 5k in standardsetting? 5k->audiobah might be a high, there also being a tiny capacitor to gnd on signal input, don't know...

KR500 · « **Reply #1287 on:** 14 Feb 2015, 06:09 pm »

I was looking at the Stahl and Weller $50 soldering stations but just ordered the Hakko Dash 25 watt iron and 2 tips for it , a 2mm bevel and 3mm screwdriver tip from a Hakko Dealer in NJ

pslate · « **Reply #1288 on:** 14 Feb 2015, 10:41 pm »

Wow I received the most unexpected moment of audio nirvana. I just replaced a Dayton DTA 100a with SMSL SA-60, and this is just application for TV, nothing is expected. I have an apple TV hooked up to it, and I am stunned playing Beck's morning phase. I like what I'm hearing more than with my turntable and on my main system. I have to A/B. But man, I was not prepared for this, but am just so darn happy. This 3116 is something very special. Just glad I got to experience at random and be amazed.

KR500 · « **Reply #1289 on:** 14 Feb 2015, 11:23 pm »

Good to know , I just bought a SMSL 36A pro and it will replace a Topping 21 for the TV 2 channel sound . Also have the Apple TV2 and will be switching amps this week.
I'm looking at the SMSL $49 DAc to include for the TV

pslate · « **Reply #1290 on:** 16 Feb 2015, 02:18 pm »

Does consensus opinion support the use of around 19V for a power supply as listed here http://www.diyaudio.com/wiki/TPA3116D2_Boards#Power_Supply ? I am interested in feedback on different power supplies people have used and how they influence the sound. This is just for my SMSL Sa-60. I used the Dayton 24V power supply from the DTA-100A, and the provided 19.5V supply (I think, I do not have it in front of me). I am not experienced person with electronics, but the 24V seemed to have a fatter and warmer more 3d sound with sloppy or ill defined bass, whereas the 19.5 was cleaner with tight bass, even perhaps more of it, but less warm and 3d. Am I crazy? What have others found out?

Odal3 · « **Reply #1291 on:** 16 Feb 2015, 04:27 pm »

The quality of the power supply makes a big difference. I highly recommend picking up a used Astron. The voltage is lower but I take that any day to get the HUGE improvement in sound vs laptop bricks or some of the wall warts supplied with cheaper t amps. There are a few threads on this forum on the Astrons if you search for it.

roymail · « **Reply #1292 on:** 20 Feb 2015, 01:21 am »

Although the standard input impedance of the YJ blue/black TPA3116 board is 30K which is a little below the recommended minimum of 47K for most passives, it worked remarkably well in my little single source system. The YJ TPA3116 powered by an Astron PS into my resistor based passive, modded CD player and 92db speakers produced very nice sonics. So passive users should give it a try. I did and was pleasantly surprised.

suvaga · « **Reply #1293 on:** 20 Feb 2015, 09:56 pm »

Ok so I have a question. 3116 fever struck hard so I bought the Yuan Jing blue board and some other stuff to put it all together in a home built cabinet. Maybe I will do some mods later if I have time but..... I do see that a lot of people put a Panasonic FM 2200uF / 25V on the power supply. Is this always an improvement or does it depend on the board?? And is it possible to use a bigger cap (I have a 3300uF 35V lying around)?

Also, I read in some posts that this board does "pop" when flipping the power switch. Now the board has not arrived yet so I don't know if this "pop" actually occurs , but any suggestion up front on how to prevent this "pop".

Update 2014-03-05:
I the meantime I received the board and it does not pop so I don't have to worry about that. Also I did end up buying the Panansonic FM caps because these appear to be the best onces. According to many hour of reading online.

I made some progress on the cabinet/enclosure already. I used some pieces of MDF, some red spray paint and I bought a strip of alumuninium (30mmx3mm). I think will not use a volume pot because when this i finished I would like to combine it with a 6n3 preamp. I temporarily connected everything and so far I am pleased with the results. The board is connected to my airport express for now.

danali · « **Reply #1294 on:** 22 Feb 2015, 04:10 pm »

Is the work and cost involved really superior to the dta 100 amp offered by PE?
By the time you purchase power supply, pre etc you are pretty darn close for an unfinished product. Anything else finished comparable? Have a topping 22 driving the pioneers, looking for a little more juice.
thanks

Poultrygeist · « **Reply #1295 on:** 22 Feb 2015, 09:01 pm »

I have the DTA 100 and it's not in the same league.

exspec · « **Reply #1296 on:** 26 Apr 2015, 07:36 pm »

I ordered the same board as Trikster on the previous page - I believe it is based of the Audiobah board.

I see it has the 10K resistor to ground, but have trouble figuring out what that does to the input impedance of the amp - I see a 20K and 100K as well - that made me think the 26db/30K input impedance, but see that someone above posted that the 10K resistor changes it - any way to confirm what the impedance is?

Hoping to use the amp as a power amp letting the preamp do all volume/input controls.

Markvdv · « **Reply #1297 on:** 26 Apr 2015, 09:48 pm »

For a "preamp" the inputimpedance is high enough, for a passive preamp you could use 10k as indication for that ampboard. With DMM I measured 9k2 btw, on my ac1308 ampboard powered on. I am not certain it is completely accurate measuring that way, I would expect a little above 10k but measure a little below, but might also be frequency dependant and chinese parts may be 10% tolerance or worse??

exspec · « **Reply #1298 on:** 27 Apr 2015, 02:44 am »

Thanks. So from what I gather, the input impedance is actually 10K not 30K? Or am I totally confused?

Markvdv · « **Reply #1299 on:** 27 Apr 2015, 08:55 am »

Yes, I would say 10k is a nice estimate for inputimpedance regardless of gainsetting on those boards.