Poultrygeist
Lunatic Member
Haven't had an opportunity to A/B them yet but a friend who has both prefers the green board.
TPA 3116 vs the tripaths
- Thread starter Poultrygeist
- Start date
http://controls.taobao.com/?spm=2013.1.0.0.f0fwET
They also produce other versions.
price for audiobah green board ex shipping ~$8
They also produce other versions.
price for audiobah green board ex shipping ~$8
Last edited:
cleonjr
Super Member
Interesting once you get the language curve figured out,they even have a modified board already done in mono 100W http://item.taobao.com/item.htm?spm=a230r.1.14.109.cguAeN&id=39317633152&ns=1&_u=91vcnk7926db#detail now I have to figure out the conversion of a yen.
JLange2010
Well-Known Member
After a casual search, I noticed two types of green boards, the audiobah version and one other, the second having far more components that project up above the actual board. The audiobah version claims to be the only board with "speaker protection", while the other boasts of name brand components. Can anyone comment on other differences, and if one is intrinsically better? Why, Poultrygeist, did you choose the audiobah version?
What other green board has more components?
Jadran
Off The Record
He's already answered few pages back:
Here's post from the other forum about it
How? You do Chinese? :scratch2:
cleonjr
Super Member
Got it translated joined membership didnt get it though got to be to invasive on information when payment page came up.but those boards are out there gonna find em,you can bet real money on that.
Audiobah green board is designed with 8 ohm speakers in mind, YJ blue/black board according to TI recommended 4 (to 8) ohm speakerload. Standard red YJ boards bought today have similar outputfilter as audiobah and is designed for 8 ohm load.
There is 1 review comparing red with green on diyaudio forum, conclusion was reviewer thought he liked red better. But all these boards cost next to nothing, not a big deal to buy all
There is 1 review comparing red with green on diyaudio forum, conclusion was reviewer thought he liked red better. But all these boards cost next to nothing, not a big deal to buy all
Jadran
Off The Record
Actually there are more 'green' and all other colors and models. A lot info on DIY forum
The another one with 'speaker protection' or as they call it 'silent sleep design'
with a great price - http://www.aliexpress.com/item/Free...50-W-with-Silent-Sleep-Design/1586764360.html
I wish I saw this one before ordering from the lazy and expensive 'a'bah', though
Email the sellers and ask them befor they ship your order Both sellers you mention have delivered 1.0 amps befor, but it is for both these boards 4 or 5 solderjoints, both are fully prepared. If you only want to use them as 1.0 I am also sure Hiamplifier can sell you pcb's without the parts you won't be using in 1.0.
post crossed: Yes I think taking a break and not trying to do 7 amps at 1 time could be better
Both sellers you mention have delivered 1.0 amps befor, but it is for both these boards 4 or 5 solderjoints, both are fully prepared. If you only want to use them as 1.0 I am also sure Hiamplifier can sell you pcb's without the parts you won't be using in 1.0.post crossed: Yes I think taking a break and not trying to do 7 amps at 1 time could be better
cleonjr
Super Member
Email the sellers and ask them befor they ship your order
post crossed: Yes I think taking a break and not trying to do 7 amps at 1 time could be better
yea I have emailed them,i just cant see buying a stereo board and turning it into mono if there is one already and a 3116@ 100 watts ,oh my.
lico
Super Member
Audiobah green board is designed with 8 ohm speakers in mind, YJ blue/black board according to TI recommended 4 (to 8) ohm speakerload. Standard red YJ boards bought today have similar outputfilter as audiobah and is designed for 8 ohm load.
There is 1 review comparing red with green on diyaudio forum, conclusion was reviewer thought he liked red better. But all these boards cost next to nothing, not a big deal to buy all
Not exactly true but close enough on the output filters. I posted before how the red board has inductor sizes tuned for 6 ohm, you need bigger inductors for 8 ohms if you follow the TI docs. It's all a moot point anyway to me - the output filtering on these boards does not affect anything in the audible pass band, unless the filters cause peaking at 20 kHz, which nobody is going to hear anyway. I bet I could run these cards without any output filter and they would sound pretty much the same. Heck they might sound even better... if one is to worry about the quality of inductors on the card (impedance at different frequencies or DCR) then why not remove them. The DIY audio guys stress too much on things that for most don't matter IMO.
Lico you may have posted befor that 22uH with 680nF is an optimal 6ohm load filter for this amp, but you were mistaken then and repeat that mistake now. SLOA119A can refresh your memory, as many other documents.
The statement that it will not be audible might be true if you add some tube amp to reshape the frequency respons. An outputfilter used on these boards starts visably affecting frequencies from 2000hz and up when looking at a frequency respons curve and remember those are most often made with a constant resistor.
Will the 3116 be better without an outputfilter, yes. Ferritebeads have less problems, distortion is always lower, speakercords should be short however (<1.25 meter I believe) if longer they become antennas for transmitting radiowaves, that might disturb other electronics and several countries have rather strict laws about that. Skip the ferritebeads and you might have a very powerfull radiotransmitter And I almost forgot, some people have very sensitive tweeters that might not like 8A at 400khz
With a peaking filter that 8A peak current could be at filterfrequency, google TDA7498 Trevor Marshall to see that that does happen.
TI itself has a document about filterfree operation, with twisted 60cm speakercords with ferritebeads the tested 2watt amplifier produced 0.5 watt at chip operating frequency (~400khz), conclusion: your laptopspeaker is probably able to handle that. Isn't that nice, now use a 50 watt amp in this setup.....
The statement that it will not be audible might be true if you add some tube amp to reshape the frequency respons. An outputfilter used on these boards starts visably affecting frequencies from 2000hz and up when looking at a frequency respons curve and remember those are most often made with a constant resistor.
Will the 3116 be better without an outputfilter, yes. Ferritebeads have less problems, distortion is always lower, speakercords should be short however (<1.25 meter I believe) if longer they become antennas for transmitting radiowaves, that might disturb other electronics and several countries have rather strict laws about that. Skip the ferritebeads and you might have a very powerfull radiotransmitter
And I almost forgot, some people have very sensitive tweeters that might not like 8A at 400khzWith a peaking filter that 8A peak current could be at filterfrequency, google TDA7498 Trevor Marshall to see that that does happen.
TI itself has a document about filterfree operation, with twisted 60cm speakercords with ferritebeads the tested 2watt amplifier produced 0.5 watt at chip operating frequency (~400khz), conclusion: your laptopspeaker is probably able to handle that. Isn't that nice, now use a 50 watt amp in this setup.....
Last edited:
lico
Super Member
Lico you may have posted befor that 22uH with 680nF is an optimal 6ohm load filter for this amp, but you were mistaken then and repeat that mistake now. SLOA119A can refresh your memory, as many other documents.
The statement that it will not be audible might be true if you add some tube amp to reshape the frequency respons. An outputfilter used on these boards starts visably affecting frequencies from 2000hz and up when looking at a frequency respons curve and remember those are most often made with a constant resistor.
Will the 3116 be better without an outputfilter, yes. Ferritebeads have less problems, distortion is always lower, speakercords should be short however (<1.25 meter I believe) if longer they become antennas for transmitting radiowaves, that might disturb other electronics and several countries have rather strict laws about that. Skip the ferritebeads and you might have a very powerfull radiotransmitter
With a peaking filter that 8A peak current could be at filterfrequency, google TDA7498 Trevor Marshall to see that that does happen.
TI itself has a document about filterfree operation, with twisted 60cm speakercords with ferritebeads the tested 2watt amplifier produced 0.5 watt at chip operating frequency (~400khz), conclusion: your laptopspeaker is probably able to handle that. Isn't that nice, now use a 50 watt amp in this setup.....
Visible affects in a frequency response curve of any of the LCR output filters certainly isn't audible starting 2000 Hz. No way, no how. It's in the noise.
I was talking about at 20 kHz where typically you might get a couple of dB change if things aren't matched right. I can't hear 20 kHz and I am pretty sure you can't either. I'm pretty sure nobody on this forum can as well. Once again, in the noise.
Agree that running a TPA 3116 without any output filter might be a power hog at the switching frequency. I'll take your word on that TI document without posting a link.
But running a TPA 3116 even with mismatched output filters for a particular speaker impedance is still going to attenuate the switching frequency down where it doesn't matter much at all. It's negligible and worrying about inductor values is silly. Try spicing it up sometime and you'll see what I mean.
Oh... forgot to add I don't use laptop speakers. Filter free would make perfect sense for active monitors, no?