TI TPA3100D2, Amazing Class D Amp

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#21
Thanks for the offer, but I wouldn't be able to offer any useful input on it. I'm admittedly not an audiophile and there would have to be a serious flaw in the design for it to sound any different to me than the other dozen amps I have sitting around.
 
#22
wushuliu said:
The RCAs are a problem. Maybe someone can figure it out: They have differential inputs with jumpers by them for unbalanced. I have no idea what balanced rca's exist that could be used in the first place. Anyway, I tried to bypass the rca inputs but nothing worked. I tried to solder connections directly to the pads which normally works fine but there is something to how the differential input is set up that I am missing because nothing works. So I have to plug an rca into the jacks and run wires from the plugs to the chassis inputs, creating an unneeded extra connection.

If someone can explain how to avoid having to use the stock rca that would be great.


HI Wushuliu,
Can you elaborate on the rca input.
What is a differential input ? How do you manage to get the sound with the standard rca input ?
Would be nice if you can post a picture of the rca input in your set up >.
Anybody planning to make a pcb for this chip ?
thanks

kp93300
Click to expand...
 
#23
The board has jumpers for standard rca. The development board pdf in the first post has pics so you can see the jacks and explains differential input.

lol I don't think this thread has generated enough attention to have anyone rushing to make a pcb yet.
 
#26
I post the schematic from the application manual


thanks for the tip
 

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#30
I bought the evaluation board and powered with a 12 V SLA last night.. I tried it with and without buffer and Buffalo 2 dac . My speaker is 91db efficient and has it own powered woofer.
I listen for about 1 hr. The impression may not hold later. with run in.
Compared to my modded Trend audio 10.1, the bass and high is lacking.


Hi Wushuliu, what is the size of the power supply caps and input coupling caps in TBI ??
What is the power supply V in in the TBI?

thanks

kp93300
 
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#33
wushuliu said:
I have no problem w/ bass or treble. The TBI is similar to the eval board in terms of component values as far as I could tell.
Click to expand...

This may sound like an ignorant question but is the eval board something you can just hook up to a power supply and the speakers and get it going right away?

I figured maybe it would be cheaper to build a board myself but I'm not done reading on electronics and I think I might try simple "hook ups" to start.
 
#37
I use a Meanwell 24v SMPS at 25.8v. I have also used batteries and compared with the TBI and although the TBI sounds a little bit better (due to the buffer?) I did not hear any kind of rolloff... Have you played with the gain?
 
#39
I set the gain at 26 db. Tried a buffer and didnot improve bass and treble.
Vocal has a tube type of sound and is good with the eval board..
I notice that the board use 1uf smd ceramic input caps . The Texas chip is smaller than the Tripath chip.

Hope all this will improve with more cap burnt in.

cheers
kp93300
 
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