WoW... this thread keeps growing and growing...this is great, it took me nearly two weeks to catch up in my little spare minutes!!!....
xrk971!!!... I still owe you the tpa311x minidsp board, I hope to have it ready by the end of the week, at least let me put myself a date... otherwise... wont never end it!!... LoL...
Here its my idea, why we dont create our pcb, I mean, a revised version of the Yjblue/black board, with giancarlo pop noise filter, and also adding the bootstrap snubber, also adding whatever it comes to the air, for this, I think that the best it would be to open a new thread, to discuss it...
Also we could also offer our board to YJ, so they have a nice board to sell, but of course they will have to send us a few boards to try it, beside that, I could try to find a good pcb maker here in Europe and produce a few for the forum members.
What do you think!?... Of course... I need to finish first xrk971 minidsp 311x board!!!....LoL... Wich by the way I will add the bootstrap snubber and if you like the giancarlo pop noise filter.
xrk971!!!... I still owe you the tpa311x minidsp board, I hope to have it ready by the end of the week, at least let me put myself a date... otherwise... wont never end it!!... LoL...
Here its my idea, why we dont create our pcb, I mean, a revised version of the Yjblue/black board, with giancarlo pop noise filter, and also adding the bootstrap snubber, also adding whatever it comes to the air, for this, I think that the best it would be to open a new thread, to discuss it...
Also we could also offer our board to YJ, so they have a nice board to sell, but of course they will have to send us a few boards to try it, beside that, I could try to find a good pcb maker here in Europe and produce a few for the forum members.
What do you think!?... Of course... I need to finish first xrk971 minidsp 311x board!!!....LoL... Wich by the way I will add the bootstrap snubber and if you like the giancarlo pop noise filter.
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Welcome back Danzz. Where have you been? The thread grew from 200k views to nearly 400k while you were out! 🙂
No rush on the miniDSP PCB - but your ideas of adding all the improvements is great. In case you missed it, DUG is finishing up his Group Buy PBTL PCB and it incorporates most of these improvements.
One thing that I am wondering about is whether or not the sound quality is best with all SMT components as close to the board as possible. That seems to be the indications based on latest experiments to move input caps to a few mm from pins.
The problem with offering the new design to YJ or whoever to build of is is complicated by fact that they probably have churned out 4 million copies of blue/black board and it will be a while before those supplies run out 🙂
Cheers,
X
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skylab: maybe it is just the picture, but DC looks very close to Wima/resistor soldered pins on the right side.
It's a very good idea!
May I suggest a place for a mini dipswitch for choosing the modulation frequency?
And to have a dip switch to select the gain can be useful?
Too mess?
I presume you have seen the thread that DUG started for his mono PCB?
http://www.diyaudio.com/forums/group-buys/257996-gb-tpa3116-8-pbtl-bare-pcb.html
I second this. Will it be possible to put jumper there for switching between BTL and PBTL mode? I really don't need more than 50W with my 96db speakers.
The audiobah may just be out of stock, I used to see it on taobao a lot and now just all gone.
Most of the three weeks was shipping from China. It's about right for economy shipping. I wasn't complaining, just saying how long it takes to get one.
Randy
Since you already have your layout, why not upload it to EasyEDA - Web-Based EDA, schematic capture, spice circuit simulation and PCB layout Online where we can all edit it to add the particular mods we want?
That'll be an interesting exercise in crowdsourcing the ideal amp board.
Indeed only 421 units left for immediate shipping🙂
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Yes it can , I already did this in the mini dsp tpa311x Im finishing to xrk971. I Think I already posted a pic of that board...
YJ Blue/Black with Coilcraft MSS1583-103MEB
I just swapped out the stock YJ inductors with nice Coilcraft MSS1583-103MEB units (http://www.coilcraft.com/mss1583.cfm). These are substantially beefier looking and have quite a nice rating for saturation current. The swap was easier than I imagined - although it helped to pull out the Panavise PCB holder and fat chisel tip for the soldering iron. The whole swap took 15 minutes and resulted in a few superficial blemishes to nearby caps but all is OK. I am listening to it now and it sounds great, although the improvement was not as dramatic like putting in the bootstrap snubber mods. One thing I am noticing right away is that the micro-details and ambient sounds that the recording engineer did not mean to capture are more present (chair legs creaking, light footsteps in background, saxophone pads hitting their stops, etc). So the amp is more revealing of nuances and even flaws in a recording. Sounds very nice - probably the best the TPA3116D2 has sounded with the addition of the bootstrap snubber and now the upgraded coils.
One curious thing is that the coils still feel warm relative to the Ybdz Wiener. It must have something to do with how YJ blue/black is configured with combination of cap and resistor values. I noticed that the post LC snubber resistors are 5.4 ohms vs the 3.3 ohms as recommended by the TI datasheet. Maybe something there?
Anyhow, a worthwhile and not too hard mod to do - highly recommended.
I just swapped out the stock YJ inductors with nice Coilcraft MSS1583-103MEB units (http://www.coilcraft.com/mss1583.cfm). These are substantially beefier looking and have quite a nice rating for saturation current. The swap was easier than I imagined - although it helped to pull out the Panavise PCB holder and fat chisel tip for the soldering iron. The whole swap took 15 minutes and resulted in a few superficial blemishes to nearby caps but all is OK. I am listening to it now and it sounds great, although the improvement was not as dramatic like putting in the bootstrap snubber mods. One thing I am noticing right away is that the micro-details and ambient sounds that the recording engineer did not mean to capture are more present (chair legs creaking, light footsteps in background, saxophone pads hitting their stops, etc). So the amp is more revealing of nuances and even flaws in a recording. Sounds very nice - probably the best the TPA3116D2 has sounded with the addition of the bootstrap snubber and now the upgraded coils.
One curious thing is that the coils still feel warm relative to the Ybdz Wiener. It must have something to do with how YJ blue/black is configured with combination of cap and resistor values. I noticed that the post LC snubber resistors are 5.4 ohms vs the 3.3 ohms as recommended by the TI datasheet. Maybe something there?
Anyhow, a worthwhile and not too hard mod to do - highly recommended.
Attachments
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That would be interesting, but I have to Look for that layout, that one I posted , it was totally remade, I believe I still have it some where in the laptop, as I had to format a couple of times since Then, must be in the backup...
I thought about a new thread also becouse beside its a great chance to improve a board that had a great welcome, also that other members could expose their thoughts of how to improve it, so as Im a total newbie, I could also learn...
Let me finish xrk971 board, and I Will Look the other boards I made ( I had a 5cmx5cm, already made as well).... And start moving the new thread.
xrk971, did you add the bootstrap snubber mod to this board? If so, can you flip it over and take a pic? I would like to try that mod next but am unsure as to where to access ground traces to attach the parts.
OOPS! sorry, I see your pic back a few pages, missed it. Thanks for posting.
http://www.diyaudio.com/forums/class-d/237086-tpa3116d2-amp-383.html#post3990270
OOPS! sorry, I see your pic back a few pages, missed it. Thanks for posting.
http://www.diyaudio.com/forums/class-d/237086-tpa3116d2-amp-383.html#post3990270
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This is an easy mod and you can scrape off varnish for a ground pad almost anywhere convenient - just make sure it is ground underneath before scraping. There are a few places for Vcc and line in.
I took my stock Ybdz/Wiener board for a spin this weekend, and something is definitely askew with it. Basically, it sounds like all the highs have been filtered out (as though my tweeters were removed). It's not subtle, either. My wife was in the same room, and even though she wasn't even paying attention to what I was doing, she noticed right away. What music did come through sounded OK, but hard to do any real evaluation when there's such a glaring problem.
What might the cause of this be, or where should I start to look for a possible culprit?
One other thing that's weird, which may be related: I used my DMM to check the gain setting resistors. The one closest to the edge of the board measured about 100k. But the other's value kept increasing about 10 ohms/sec. I kept my probes on there for quite a while, and it never "settled". If I removed the probes and put them back on, it picked up right where it left off and then resumed the steady increase. Never seen anything like that.
Side note: I'm pretty sure I didn't get a heatsink with mine. I actually dug through the garbage and found the packaging, no heatsink. It could have fell out of the packaging I suppose, and got lost with all the trash, but looking at xrk971's pic, I think I would have noticed that heatsink floating around in there.
What might the cause of this be, or where should I start to look for a possible culprit?
One other thing that's weird, which may be related: I used my DMM to check the gain setting resistors. The one closest to the edge of the board measured about 100k. But the other's value kept increasing about 10 ohms/sec. I kept my probes on there for quite a while, and it never "settled". If I removed the probes and put them back on, it picked up right where it left off and then resumed the steady increase. Never seen anything like that.
Side note: I'm pretty sure I didn't get a heatsink with mine. I actually dug through the garbage and found the packaging, no heatsink. It could have fell out of the packaging I suppose, and got lost with all the trash, but looking at xrk971's pic, I think I would have noticed that heatsink floating around in there.
That is not good news Matt Garman. Sorry to hear so many people are having issues with boards that used to be good. The Wiener was one of the "good guys". The problem you describe seems to point to an issue with the input coupling capacitor or path to it and from it to the chip input. Or it could be something in the output filter stage that is imposing what appears to be at least a 6khz low pass filter because that is when it is noticeable that highs are missing.
I would check to make sure the input caps are still good. Also look for solder bridges or flux residue around input pins side of chip. If you have a mic and REW or other measurement software take a nearfield sweep with it. I know my Wiener goes up to 18khz as limited by my speakers. No highs are missing whatsoever.
You can also file complaint to Aliexpress and they will most likely refund you the money and you keep the defective amp.
Good luck.
I would check to make sure the input caps are still good. Also look for solder bridges or flux residue around input pins side of chip. If you have a mic and REW or other measurement software take a nearfield sweep with it. I know my Wiener goes up to 18khz as limited by my speakers. No highs are missing whatsoever.
You can also file complaint to Aliexpress and they will most likely refund you the money and you keep the defective amp.
Good luck.
I just swapped out the stock YJ inductors with nice Coilcraft MSS1583-103MEB units
One curious thing is that the coils still feel warm relative to the Ybdz Wiener. It must have something to do with how YJ blue/black is configured with combination of cap and resistor values. I noticed that the post LC snubber resistors are 5.4 ohms vs the 3.3 ohms as recommended by the TI datasheet. Maybe something there?
Anyhow, a worthwhile and not too hard mod to do - highly recommended.
Strange isn't it, for 10 degrees Celsius rise these inductors will need ~4 amperes...
Snubber resitors YJblue here 10 ohm
My post LC filter snubber resistors are yellow/purple/black or 5.7 ohms here. I measured them on-board as 5.4 to 5.5 ohms with my cheap DMM.
The temp rise is probably not 10 deg but feels like 5 deg C. I have been listening to it for past 4 hours and sounds very nice with all of my CD's so far. No problems yet with harshness, sibilance, fizz, etc. yet. Dave Brubeck pianos sounds very nice indeed. Robert Cray sounds excellent. Diana Krall sounds fantastic.
I am not running symmetric input caps yet - my +ve input is 3.3uF while the -ve is stock 1uF. Should I bother changing it?
I am eyeing the Vacc decoupling mod next but kind of a pain because I don't want to pop the heatsink off as it is bonded on with some sort of white heatsink cement.
Also, this mod is risky as I will be taking a razor to the trace at pin 17 and pin 18 pad to sever them. Hmmm....