Dug,
Wow those look beautiful, you do some really nice work there. Amazing to think that this little thing pumps out 50 watts/ch! Is this the base circuit from the part spec sheet and not the eval board circuit?
Regards,
X
Wow those look beautiful, you do some really nice work there. Amazing to think that this little thing pumps out 50 watts/ch! Is this the base circuit from the part spec sheet and not the eval board circuit?
Regards,
X
Last edited:
Dug,
Did you use bigger inductors than 10 uH for the subs because they look different? Spec sheet circuit calls for same - but I guess if you intend to use it to drive sub, making it bigger gives cleaner rwponse at expense of high freq response.
X
Did you use bigger inductors than 10 uH for the subs because they look different? Spec sheet circuit calls for same - but I guess if you intend to use it to drive sub, making it bigger gives cleaner rwponse at expense of high freq response.
X
No, I did not make the boards but I did the layout, soldering, etc.
The other thing I did not do was mil the 1mm recess in the bottom of the heat sink...CNC guy did that for me.
Sounds great...(IMHO) 🙂
The other thing I did not do was mil the 1mm recess in the bottom of the heat sink...CNC guy did that for me.
Sounds great...(IMHO) 🙂
. Will report back in about 2weeks from now. Received the mic board just before I went travelling
I just asked Cristi of Connexelectronic if he would consider designing an amp based on the new TPA chips. He just replied that he would consider designing an amp, possibly with onboard smps which is his specialty. I've used several of Cristi's amps, they are very very well designed and he has many happy customers. I suggest anyone interested in these TPA chips head to the Class D Connexelectronic forum here to let him know there is interest for such an amp!
cervelorider (posts here) built me a tpa3100 amp (parts express board), I'm sure he'll build you one too.
Here is is very nice website.
http://www.fleawatt.blogspot.com/
But I think he's moving on to tpa3122 now.
I just hooked mine up this morning.
FLEAWATT : Fleawatt Cigar Box Amplifier
I'm using it with a revealing 110db jbl 2407 compression driver on a nice round mcm horn (54-580).
Has anyone bridged the 3110 ?
Seems to me the lack of output filter (only ferites) goes a long way on improving the sound vs a 12 or 18db filter with their numerous parts.
Norman
Here is is very nice website.
http://www.fleawatt.blogspot.com/
But I think he's moving on to tpa3122 now.
I just hooked mine up this morning.
FLEAWATT : Fleawatt Cigar Box Amplifier
I'm using it with a revealing 110db jbl 2407 compression driver on a nice round mcm horn (54-580).
Has anyone bridged the 3110 ?
Seems to me the lack of output filter (only ferites) goes a long way on improving the sound vs a 12 or 18db filter with their numerous parts.
Norman
Last edited:
Norman,
Cervelorider makes nice stuff and is a great guy. I think the 3110 is designed for ferrite bead chokes if the speakers are very close to amp with short run of like a foot (like a boom box). I think their literature says to use a real wound inductor and capacitor and resistor network filter for long runs up an external speaker. Also, I think it is bridgable but not sure if the Sure board is set up to allow that. How does it sound with your CD and horn setup?
Cervelorider makes nice stuff and is a great guy. I think the 3110 is designed for ferrite bead chokes if the speakers are very close to amp with short run of like a foot (like a boom box). I think their literature says to use a real wound inductor and capacitor and resistor network filter for long runs up an external speaker. Also, I think it is bridgable but not sure if the Sure board is set up to allow that. How does it sound with your CD and horn setup?
tpa3110 is already bridged. Tpa3116 and Tpa3118 are both the same chip, one with heatsink pad up allowing adding of heatsink above chip and other using pcb for heatsinking thus the lower power ratings. Thats why I said you already built tpa3116 since your dead bug chip was upside down with heat pad up.
tpa3130 is lower current version more suitable for 8 ohm loads.
tpa3130 is lower current version more suitable for 8 ohm loads.
Capt Grogg,
You are serious? The difference is in the orientation of powerpad only? That may not be true because the letter designations following the chip number DAP (down) vs DAD (up). Why didn't they just call 3118D2 the 3116D2DAP? Neat if so, I can say I know what the sound of the 3116 is like - the same!
You are serious? The difference is in the orientation of powerpad only? That may not be true because the letter designations following the chip number DAP (down) vs DAD (up). Why didn't they just call 3118D2 the 3116D2DAP? Neat if so, I can say I know what the sound of the 3116 is like - the same!
I am using the Parts Express TPA3110. It is a terrific amp. And only $10(!!!!!!). It's pointless even trying to convince anyone how good it sounds because it's so cheap. However it is also an older chip like the 3100D2 and the 3122/3. The 3116/8 chips are the newest and the TI docs show improved channel separation and distortion, so I am really hoping Cristi gives them a go.
TPA3116 vs TPA3118 vs TPA3130
TPA3116 pdf here:
http://www.ti.com/lit/ds/symlink/tpa3116d2.pdf
jpg shows different thermal resistances to heat sink pad. (from data sheet)
I had thought that the TPA3116 had higher output current but both the TPA3116 and the TPA3118 are rated for 7.5A while the TPA3130 is only 4.5A (bottom of page 6)
TPA3116 pdf here:
http://www.ti.com/lit/ds/symlink/tpa3116d2.pdf
jpg shows different thermal resistances to heat sink pad. (from data sheet)
I had thought that the TPA3116 had higher output current but both the TPA3116 and the TPA3118 are rated for 7.5A while the TPA3130 is only 4.5A (bottom of page 6)
Attachments
This is why I was spec'ing the more expensive 7.5 amp inductors at first. But when you pointed out thatook i=V/R we get 24 volts/8 ohms = 3 amps. For 4 ohm speakers you need more or for peak transients. But transients are short and inductor should be able to handle it. The inductors are the single most expensive part (besides IC and PCB) if you go with 7.5 amp units ($1/ea) vs $0.63/ea for 3 amp ones. Are you recommending the bigger ones now? That's what I have in the 3118 foam core build.
Last edited:
Remember that even though the smaller inductors will handle the current, they will be at a lower inductance during that time.
This will change the filtering characteristics and the loading "isolation" for the IC.
I try to design with inductors that do not change more than 10% of value for max current.
Some data sheets give the inductance vs current graphs...these are the ones to look at because you know what they are doing.
IMHO, of course.
This will change the filtering characteristics and the loading "isolation" for the IC.
I try to design with inductors that do not change more than 10% of value for max current.
Some data sheets give the inductance vs current graphs...these are the ones to look at because you know what they are doing.
IMHO, of course.
I am going to see if I can pull up a spec sheet for the inductors I got. I doubt the cheap one has it, but the bigger one is a Bournes - reputable company probably has it. I never even knew about how the inductance can change with current. Thanks for pointing that out. So the 3 amp units you spec'd from Digikey have the proper behavior with current?
Hello Folks,
I am using the Murata 12RS333C for my TPA3100D2PHPR design. They are PTH types. I could not find the Toko ind's that were used by TI in the eval brd. As far as listening experience goes, they seem to be just fine. For my last build, Digi-key/Mouser did not have the (12RS333C) so I sub'd the 12LRS333C. I can not hear any diff. I have yet to actually do measurements of this amp.
Would like to know:
1) If you can share what exact inductor MFG PNs you are using?
2) What are your measurements and what is the setup? In my setup I would use an Amber 3501, since it has the balanced input option. I have measured the pre-amp in my design and it came in at ~0.03%@1kHz, just as Maxim spec'd for the part, so having it in the test path with the TPA3100D2 would be insignificant, in my mind.
I am considering designing a TPA3116/18 as well, since I like its AM avoidance & common footprint feature.To bad the 3116/18 were not avail when I did the 3110D2 dsn or I would have used them instead. Sonically, I do not think that there would be much diff. between the two, do not know for sure, until I try.
Cheers, keep up the great thread discussions regrading these great amps.
It is funny that I have the amp hooked up to a lab supply, so I can monitor the power/current, play with the V, etc. I can crank it and the I meter hardly moves at all. The LCD back light draws more juice 🙂
Rick
I am using the Murata 12RS333C for my TPA3100D2PHPR design. They are PTH types. I could not find the Toko ind's that were used by TI in the eval brd. As far as listening experience goes, they seem to be just fine. For my last build, Digi-key/Mouser did not have the (12RS333C) so I sub'd the 12LRS333C. I can not hear any diff. I have yet to actually do measurements of this amp.
Would like to know:
1) If you can share what exact inductor MFG PNs you are using?
2) What are your measurements and what is the setup? In my setup I would use an Amber 3501, since it has the balanced input option. I have measured the pre-amp in my design and it came in at ~0.03%@1kHz, just as Maxim spec'd for the part, so having it in the test path with the TPA3100D2 would be insignificant, in my mind.
I am considering designing a TPA3116/18 as well, since I like its AM avoidance & common footprint feature.To bad the 3116/18 were not avail when I did the 3110D2 dsn or I would have used them instead. Sonically, I do not think that there would be much diff. between the two, do not know for sure, until I try.
Cheers, keep up the great thread discussions regrading these great amps.
It is funny that I have the amp hooked up to a lab supply, so I can monitor the power/current, play with the V, etc. I can crank it and the I meter hardly moves at all. The LCD back light draws more juice 🙂
Rick
TPA3116
The 10uH I used for the 8R version is here:
http://www.vishay.com/docs/34104/lp25cz01.pdf
A little below 10uH but does not droop very much at 3A.
The one I chose for "7.5A" was not as good a choice.
It drop 10% at 4A and 20% at 6.5A
I haven't used it yet so I will have to reserve opinion whether it is OK or not.
Live and learn.
🙂
The 10uH I used for the 8R version is here:
http://www.vishay.com/docs/34104/lp25cz01.pdf
A little below 10uH but does not droop very much at 3A.
The one I chose for "7.5A" was not as good a choice.
It drop 10% at 4A and 20% at 6.5A
I haven't used it yet so I will have to reserve opinion whether it is OK or not.
Live and learn.
🙂
- Status
- Not open for further replies.