P-A, I received a very nice message on my PM some days ago telling me that TI sells the PCB of the appnote.
In the States it's $49.
That guy bought it, built and reported me the results.
That's why I said I have "news" that this chip is worth a try.🙂
In the States it's $49.
That guy bought it, built and reported me the results.
That's why I said I have "news" that this chip is worth a try.🙂
peranders said:
Some crappy Sony MDR or something. Not very good.
Its just that the output I have is very low, so I will try increasing the gain and see how it does.
Soldering is a little challenging. If you can find some sort of socket for it, that would help a lot.
Carlos: I tried with 12V as well, seemed to help a little. and yes i need to increase the gain. Just wanted to build it identical to the datasheet first.
There must be something wrong with your amp. There are a few TPA6120a2 running and nothing like this lack of power was reported. Check for example this thread : http://www4.head-fi.org/forums/showthread.php?t=74525&highlight=tpa*
Thomas, I vote for something isn't otpimized. Weak input signal? Altough with only gain of 2 your ears will hurt and 5-7 Vrms will make your headphones to glow.
An oscilloscope may do some good. Can you drive the amp to clipping for instance.
An oscilloscope may do some good. Can you drive the amp to clipping for instance.
peranders said:
Nah...
With a portable device?
I can bet that the mp3 player doesn't even get to 1V output.
500mv~750mv is common for portables.
You can't ask much more for a thing that runs with one or two 1.5v batteries...
Hello again, guys 🙂 . What do you think about this idea : ten of these chips connected in parallel will can easy drive an speaker box and I mean, that it will be more better than any Aleph or Hiraga 😀 . Any comments ?
Upupa Epops said:
Mmmmm...😀
Well... if you parallel another 10 and bridge 10+10, we may be talking more serious business.😛
Carlos, I ment of course that the gain must be adjust for the application. If thomas has a weak signal he must increase the gain which is done very easily.
peranders said:
That's what I meant on a previous post.
2x gain is low, as he is testing with an mp3 player.
If the intention is to make a headamp for portables, gain should be much higher.
But the feedback resistor must remain as per the manufacturer's recommendation.
Indeed, becasue this is a current feedback amp where you also control the speed with the feedback resistor.carlosfm said:
Tip for soldering pad
I cut a small rectangle of copper out - the width of the chip - heated a blob of solder on the centre with a gas torch, then quickly stuck the chip on the molten solder. I then hard wired leads to the active legs of the chip and made up the circuit as per the basic evaluation model.
It sounds very good - my friend has a Chiarra Single Ended Class A Headphone Amp - and he was a bit sickened to hear this almost free amp.
I cut a small rectangle of copper out - the width of the chip - heated a blob of solder on the centre with a gas torch, then quickly stuck the chip on the molten solder. I then hard wired leads to the active legs of the chip and made up the circuit as per the basic evaluation model.
It sounds very good - my friend has a Chiarra Single Ended Class A Headphone Amp - and he was a bit sickened to hear this almost free amp.
Re: Tip for soldering pad
Wednsday I'm going on holidays for a week.
Don't make me take the soldering iron to the beach, please.
ericallan said:
Wednsday I'm going on holidays for a week.
Don't make me take the soldering iron to the beach, please.
So, how would one solder this chip to a PCB? Would applying solder to the copper, then putting the chip on & then warming up the opposite side of the PCB work?
Today I have started to convert my QRV04 headphone amp to AD8620 and TPA6120. I have great expectations in this IC.
The pcb will be easy to solder, even the "PowerPAD".
I haven't desided yet if the TPA6120 should run in inverting mode or not.
The pcb will be easy to solder, even the "PowerPAD".
I haven't desided yet if the TPA6120 should run in inverting mode or not.
haven't checked the datasheet yet but it should be doable to solder.
here's a guide to soldering smd parts .
here's a guide to soldering smd parts .
- Status
- Not open for further replies.