As for WS being a waste of time, I prefer a nice roll of 60/40 rosin multicore.
Its not my call to make. Whatever process is spec, I just have to deal with it.
Its not my call to make. Whatever process is spec, I just have to deal with it.
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It's alive! Halellujah! Miracle! Washing-drying-baking did the job an I hope my washing was good, and this is not just temporarily solution... Thanks again, kenpeter!
The 3110 can be bridged but there are a lot of wiring changes to do so. Not sure how easy it will be to implement on the Sure board. See Fig 38 in data sheet from TI.
I was afraid someone would ask why I made the mods I did. 😱 Don't really know what I am doing here - it's a lot of guessing and experimenting for me although I do read all the forums that I can and slowly, slowly I'm learning. 🙂
wushulin- I tried a few different caps on the 3110 and these just seemed to sound the best.
keith- the mods on the 3110 are just the 2 film caps (Elna 2.2). On the 3122D2 I changed all the rail caps to 470uf 35V and the input caps to two 2.2 and one 1.0 Elna film caps.
Please suggest better improvements that I could try for future builds 🙂
wushulin- I tried a few different caps on the 3110 and these just seemed to sound the best.
keith- the mods on the 3110 are just the 2 film caps (Elna 2.2). On the 3122D2 I changed all the rail caps to 470uf 35V and the input caps to two 2.2 and one 1.0 Elna film caps.
Please suggest better improvements that I could try for future builds 🙂
Prezden,
So you did find a noticeable improvement in switching from SMD ceramic input caps to thru hole film caps? I bought some to keep handy but wondered if they would do anything.
So you did find a noticeable improvement in switching from SMD ceramic input caps to thru hole film caps? I bought some to keep handy but wondered if they would do anything.
http://s20.postimg.org/lozv09h4t/tpa3123.jpg
I just took delivery of this Muse 50W tpa3023d2 board yesterday and tried it on a couple of pairs of speakers. On my 15 inchers and a CD player I only need to just crack the volume pot. Sounds beautiful, and no heatsinks.
For the price of a half case of beer, unbelievable.
I just took delivery of this Muse 50W tpa3023d2 board yesterday and tried it on a couple of pairs of speakers. On my 15 inchers and a CD player I only need to just crack the volume pot. Sounds beautiful, and no heatsinks.
For the price of a half case of beer, unbelievable.
Looks like they are running two 3123's in PBTL (bridged) mode to get 50 w/channel. This is what the new 3116D2 does with a single chip. A link and price paid would be useful info. Glad it sounds good. I have yet to hear somebody say a TPA chip doesn't sound good.???
I tried several different mods to the boards- especially the 3122. By replacing some caps then others until I found what sounded the best to me. On the first 3122 I tried I put some big caps on the rails and instantly blew the chip. I guess that comes with not really knowing what your doing 🙁 The nice thing about mucking about with these things is that the are so cheep to by if you screw it up it's not such a big deal 🙂
They may have sold out, you might need to check around.
2x50 w Stereo Class D Audio Power Amplifier Circuit Board TI TPA3123 | eBay
carefull on the input caps on the 3110.
The board calls for .13uF making a pole (if 20db gain setting) of 20hz. I for the life of me can't understand people put 1uF there. Poly caps, yes, that I get. Especially the feedback one........
Norman
The board calls for .13uF making a pole (if 20db gain setting) of 20hz. I for the life of me can't understand people put 1uF there. Poly caps, yes, that I get. Especially the feedback one........
Norman
after much thinking (wow smokey?) and playing with mine, I think I need to try a beefier supply than the 8 AA's I'm using now.
Also the great sound (when it's not making me angry, lol) may be due to the output not going through output coils, but then it should use only a few inchs of twisted spkr wire, unlike my 6' of parallel junk.
Isn't a 3122 basicaslly half of a 3110 ?
based on page 6 (on texas instruments data), you can't bridge a bridge amp............
http://www.ti.com/lit/ds/symlink/tpa3110d2.pdf
at 12v and 8ohms, I should be able to get 7 watts, and 4 ohms I should get 11.
(page 9 of the above pdf).
I ain't getting 11w, no way, no how, even 4.5 watts (we are not driving a resistor here folks).
I think 8 AA's can put out what, an amp? And that's not enough for 11 watts into 4ohms.....
12v into 4ohm = 3amps, 8v (subtract for .707) into 4ohms still would be 2amps (that 8 AA's can't deliver).
Am I off base ?
I am pretty new at this class D stuff..........
Norman
Also the great sound (when it's not making me angry, lol) may be due to the output not going through output coils, but then it should use only a few inchs of twisted spkr wire, unlike my 6' of parallel junk.
Isn't a 3122 basicaslly half of a 3110 ?
based on page 6 (on texas instruments data), you can't bridge a bridge amp............
http://www.ti.com/lit/ds/symlink/tpa3110d2.pdf
at 12v and 8ohms, I should be able to get 7 watts, and 4 ohms I should get 11.
(page 9 of the above pdf).
I ain't getting 11w, no way, no how, even 4.5 watts (we are not driving a resistor here folks).
I think 8 AA's can put out what, an amp? And that's not enough for 11 watts into 4ohms.....
12v into 4ohm = 3amps, 8v (subtract for .707) into 4ohms still would be 2amps (that 8 AA's can't deliver).
Am I off base ?
I am pretty new at this class D stuff..........
Norman
Norman- regarding the 3110 input caps. Am I running the risk of damaging the amp or is it just plain overkill to use the larger size caps 😕
The 3122 I built is running off a 24v meanwell. I tried using a 12v supply and the difference is huge 😀
cheers- prezden
The 3122 I built is running off a 24v meanwell. I tried using a 12v supply and the difference is huge 😀
cheers- prezden
http://www.ti.com/lit/ds/symlink/tpa3110d2.pdf
page 25, bottom
the numbers do crunch out (20db gain, 60k Zin), to a 20hz pole.
If you put a 1uF there, do you want an input pole that low ?
So 24v meanwell, I'll look it up.
Or a 12v Sla battery, how many amps ? 3 or more?
Norman
page 25, bottom
the numbers do crunch out (20db gain, 60k Zin), to a 20hz pole.
If you put a 1uF there, do you want an input pole that low ?
So 24v meanwell, I'll look it up.
Or a 12v Sla battery, how many amps ? 3 or more?
Norman
The TPA3110D2 is just screaming out for input transformers. Both + & - inputs for each channel are biased at +3V, so an input transformer could be connected directly without any coupling caps. You also don't need to trade off LF extension against charging time to keep pops away. I suspect that the transformer would also reduce any RFI interference on the input signal by acting as a low pass filter (very relevant if you use an SMPS in the same chassis). I've ordered two boards and have plenty of 600:600 transformers that will do for testing the theory 🙂
The TPA3110D2 is just screaming out for input transformers?
I guess things depend on your design, when you say this part needs a I/P transformer. I believe that it is an unnecessary expense.
I have been using this part capacitor coupled, SE, for 2 years now and it is a very well behaved part.
I would not be hooking up my best speakers to it until I was sure that this part would not fry them or had annoying pops.
These pops you speak of, could be coming from ckts up the signal chain and the transformer will do nothing to prevent it.
I use the enable pin as well, since I shut it down when I am powered from USB.
I have tried transformer and SM external supplies and have no issues.
I use a 1uF/50V/X7R/1210 coupling cap. You could get silly and use a film cap but it I doubt that you would hear the diff in a listening test or with the analyzers.
I guess things depend on your design, when you say this part needs a I/P transformer. I believe that it is an unnecessary expense.
I have been using this part capacitor coupled, SE, for 2 years now and it is a very well behaved part.
I would not be hooking up my best speakers to it until I was sure that this part would not fry them or had annoying pops.
These pops you speak of, could be coming from ckts up the signal chain and the transformer will do nothing to prevent it.
I use the enable pin as well, since I shut it down when I am powered from USB.
I have tried transformer and SM external supplies and have no issues.
I use a 1uF/50V/X7R/1210 coupling cap. You could get silly and use a film cap but it I doubt that you would hear the diff in a listening test or with the analyzers.
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