Wiener isn't that exceptional btw, Sure3116 uses like 50 caps for psu decoupling, yellow board have 10 ? electrolytics, smsl 36pro also? So some use many more🙂
With 100dB sens.
100dB = 1W
103dB = 2W
106dB = 4W
109dB = 8W
112dB = 16W
115dB = 32W
118dB = 64W
121dB = 128W
124dB = 256W
127dB = 512W
Hmm.. close enough. 😀
The whole purpose of decoupling is to present a low power supply impedance to keep the rail stable. Keep in mind that driving hard into a 4 ohm stereo load, the TPA311x's PVDD current draw can go from 50mA to 10A in an instant, keeping PVDD stable at that instant requires the decoupling network to have both low ESR and low ESL.
Want to evaluate the decoupling on a card? Get a small piece of coax with a BNC connector, solder it to the PVDD rail and ground as close as you can to the TPA3116. Bring it to an oscilloscope and set the scope for AC coupling. Put a pair of 4 ohm resistive loads on the output, and power the card off an isolated-output 24V power supply or a pair of SLAs (make sure their combined voltage is <27V so you don't pop the TPA) so you don't screw up your measurement with a power supply ground loop. Drive the card inputs with a low frequency sine wave that pushes the amp output near the point of clipping. Probe one of the OUTxx pins with a scope probe plugged into a 2nd oscilloscope channel, and trigger the scope off it.
Start/stop or single-trigger the scope a bunch of times until you catch the widest OUTxx pulse that you can indicating that you're on the peak of the audio envelope. Now have a look at how much the PVDD rail drops when that OUTxx pulse switches high, and how quickly it recovers.
Oh wait, that requires actual engineering work, and counting caps is easy... 🙄
Want to evaluate the decoupling on a card? Get a small piece of coax with a BNC connector, solder it to the PVDD rail and ground as close as you can to the TPA3116. Bring it to an oscilloscope and set the scope for AC coupling. Put a pair of 4 ohm resistive loads on the output, and power the card off an isolated-output 24V power supply or a pair of SLAs (make sure their combined voltage is <27V so you don't pop the TPA) so you don't screw up your measurement with a power supply ground loop. Drive the card inputs with a low frequency sine wave that pushes the amp output near the point of clipping. Probe one of the OUTxx pins with a scope probe plugged into a 2nd oscilloscope channel, and trigger the scope off it.
Start/stop or single-trigger the scope a bunch of times until you catch the widest OUTxx pulse that you can indicating that you're on the peak of the audio envelope. Now have a look at how much the PVDD rail drops when that OUTxx pulse switches high, and how quickly it recovers.
Oh wait, that requires actual engineering work, and counting caps is easy... 🙄
This isn't true regarding the used power-supply. No SMPS is safe with "unlimited" capacitance regarding their control-loop and switching parameters. The more the uF the more the dI/dT the more the switching-stress.
Sorry messed that one up. To my defense I am actually sick with flu and head is not doing math right. 118dB sounds right.
Hey Smithie, you probably saw my pics or syklab's way back in this thread replacing the SMDs with the OSCONS. I didnt notice any major differences with or without them, I wouldn't stress over putting the SMDs back (or removing them in the first place for those who feel the need lol)
hi jk44
it was proberly your pics that gave me the idea to test...read this whole thread and snatched info and pictures here and there to try out,but forgetting to add who did what to who😀,so yes your proberly right🙂
for me and in my system i did notice a difference,the bass become very emphasised in the lower regions,abit one note if that makes sense,also seemed to have like a ringing effect in the higher regions when playing loud...but please note that im lead by red wine and moods😀 so the effect could of been no more then those two things....really if you want to take this amp to a whole new level,then a good strong bottle of red wine works total wonders,and the cheapest upgrade ever!!
anyway i did get some replacements and put them back in,i had to have glasses on my glasses to see and fit them suckers ,but it was a challenge and fun,even if my work dont look to pretty😀.
im looking to lower gain which i think you did,i think ill try for 20db so i can get away with using some small polyprops of 1.5uf on the inputs,can i ask if you changed the slave value resistors along with the master values??
all the best
smithie
it was proberly your pics that gave me the idea to test...read this whole thread and snatched info and pictures here and there to try out,but forgetting to add who did what to who😀,so yes your proberly right🙂
for me and in my system i did notice a difference,the bass become very emphasised in the lower regions,abit one note if that makes sense,also seemed to have like a ringing effect in the higher regions when playing loud...but please note that im lead by red wine and moods😀 so the effect could of been no more then those two things....really if you want to take this amp to a whole new level,then a good strong bottle of red wine works total wonders,and the cheapest upgrade ever!!
anyway i did get some replacements and put them back in,i had to have glasses on my glasses to see and fit them suckers ,but it was a challenge and fun,even if my work dont look to pretty😀.
im looking to lower gain which i think you did,i think ill try for 20db so i can get away with using some small polyprops of 1.5uf on the inputs,can i ask if you changed the slave value resistors along with the master values??
all the best
smithie
My order of these cute amps just arrived from Aliexpress. Nicely packaged in individual antistatic sealed bag and then bubble wrap.
Thanks to Bughemeiste for the tip.
http://www.aliexpress.com/item/TPA3...oard-1X60W-12V-24V-POWER-AMP/32553840789.html
They look very nicely made, pretty hiqh quality in appearance and layout is tight. Can't get small ceramic decoupler cap or bootstraps any closer. Looks to have a power LED even. Those inductors are pretty small though.
It is printed "Sanwu" on back so I guess we call this Sanwu Blue PBTL.
It is tiny and I can see how these are ideal for integrating internally inside a small speaker. You could stick it anywhere.
I expect them to sound great. 🙂
Hook up tomorrow...
Thanks to Bughemeiste for the tip.
http://www.aliexpress.com/item/TPA3...oard-1X60W-12V-24V-POWER-AMP/32553840789.html
They look very nicely made, pretty hiqh quality in appearance and layout is tight. Can't get small ceramic decoupler cap or bootstraps any closer. Looks to have a power LED even. Those inductors are pretty small though.
It is printed "Sanwu" on back so I guess we call this Sanwu Blue PBTL.
It is tiny and I can see how these are ideal for integrating internally inside a small speaker. You could stick it anywhere.
I expect them to sound great. 🙂
Hook up tomorrow...
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Looks nice to me too.
If TDK these inductors look like SLF10145, 10% drop at 2.5A, with 6 ohm speaker that could be around maximum (rms??) current I guess, I don't calculate that well.
If TDK these inductors look like SLF10145, 10% drop at 2.5A, with 6 ohm speaker that could be around maximum (rms??) current I guess, I don't calculate that well.
2.1 Progress?
Just dipping in as I do now and again 😀
I wondered if there have been any developments yet regarding a 'proper' 2.1 amp with filtered sub/main stages?
I read this thread with some interest - a guy has modded a YuanJing 2.1 board to improve the low frequency response and to provide a variable sub filter - from post 25 onwards:
YuanJing 2.1 Board Modification
It still pumps full audio frequencies to the main outputs though.
Thanks!
Just dipping in as I do now and again 😀
I wondered if there have been any developments yet regarding a 'proper' 2.1 amp with filtered sub/main stages?
I read this thread with some interest - a guy has modded a YuanJing 2.1 board to improve the low frequency response and to provide a variable sub filter - from post 25 onwards:
YuanJing 2.1 Board Modification
It still pumps full audio frequencies to the main outputs though.
Thanks!
My order of these cute amps just arrived from Aliexpress. Nicely packaged in individual antistatic sealed bag and then bubble wrap.
Thanks to Bughemeiste for the tip.
TPA3118 PBTL mono digital amplifier board 1X60W 12V 24V POWER AMP-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
They look very nicely made, pretty hiqh quality in appearance and layout is tight. Can't get small ceramic decoupler cap or bootstraps any closer. Looks to have a power LED even. Those inductors are pretty small though.
It is printed "Sanwu" on back so I guess we call this Sanwu Blue PBTL.
It is tiny and I can see how these are ideal for integrating internally inside a small speaker. You could stick it anywhere.
I expect them to sound great. 🙂
Hook up tomorrow...
Wow, even smaller than I expected!! Cute too. Looking forward to your comments on these "tiny" things.
Regards,
Did you test them already?
Mine didn't arrive yet, but it is always the same story with german customs....
In the meantime i found them for 1Euro less on ali.
The trick was to not search for 'TPA3118' but for 'pbtl'.
You should also try sanwu's TDA8932 from this thread.
They were available for ~3,50 EUR, but now they cost about the double...
http://www.diyaudio.com/forums/class-d/277130-fasten-seat-belts-tda8932-pessimistic-review-9.html
It sounds amazing, but is only good for 8Ohm-speakers.
I have been really sick past 2 weeks and finally had some energy to go hook them up. I made a nice 4 channel enclosure with 5 way banana binding posts and four RCA inputs. I soldered up speaker out wires to ea amp and RG-174 coax for line ins. It was almost done and I would have had sound today except I am completely out of hook up wire for the power inputs. I will have to order some spools before finishing this. This is going to be another active speaker amp box with a miniDSP so there is a little bit of room. These amps are really easy to hook up. I appreciate solder holes vs terminals when build on a permanent box.
is the wiki page down for anyone else else?
I get "page not found" at http://www.diyaudio.com/wiki/TPA3116D2_Boards
I get "page not found" at http://www.diyaudio.com/wiki/TPA3116D2_Boards