TPA3116D2 Amp

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#3,083
matt_garman said:
Anyone have any experience with Sagami Inductors? They have a whole line dedicated to "Leaded Inductors for Class D". The parts that start with "7G" look appropriate (low DCR, high current, shielded). In particular, I thought this 7G14A might be appropriate for the tpa3116 output filter. They even provide a graph of inductance versus current. They say they use flat wire (like the Coilcraft).

They look like they might be easier and cleaner to mount on the YJ blue/black board than the CC inductors.

Here's one place to buy them... never ordered from them, just found them via Google search. Looks like Mouser and Digi-Key don't carry this brand.
Click to expand...

Yes, This is very good inductor. Which special for digital amplifier application. I got it and making the new board. 🙂

Inductor.JPG
 
#3,086
snake69fast said:
Hello!
Do you think I can use this one too?
Click to expand...

Says its 'ferrite core' but the yellow colour suggests no.26 iron dust core. There are about 50 turns so the AL value will be 22/2500 or roughly 10. No ferrite core I've ever heard of has such a low AL - steer well clear of these.

As regards current ratings, it depends on whether the limitation is thermal or determined by core saturation. A 3A thermal limit would be perfectly fine, a 3A core saturation limit isn't.

<edit> Now I see scrolling down that the picture's a generic one - they're showing the same for a whole range of values. My recommendation to avoid still stands...
 
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#3,087
#3,088
All inductors suck 😀

Quote from T.Marshall
"I have a graveyard of inductors from many manufacturers and of many specifications, trying to find some which would perform linearly, without excessive temperature rise at the relatively high (400KHz) voltages involved. I tried all the inductor brands Mouser had in stock, brought inductors in from Hong Kong, and even took inductors off other Class-D amplifiers. Not one inductor was perfect. The ICE 1D14A and 1D17A series were the best overall performers I found, but I selected Bourns SRF1280-150M for my SURE boards as they soldered into the same footprint as the original inductors used by SURE, and had adequate current handling for the TDA7498 operating on 32V DC."
 
#3,089
irribeo said:
Quote from T.Marshall
"I have a graveyard of inductors from many manufacturers and of many specifications, trying to find some which would perform linearly, without excessive temperature rise at the relatively high (400KHz) voltages involved. I tried all the inductor brands Mouser had in stock, brought inductors in from Hong Kong, and even took inductors off other Class-D amplifiers. Not one inductor was perfect. The ICE 1D14A and 1D17A series were the best overall performers I found, but I selected Bourns SRF1280-150M for my SURE boards as they soldered into the same footprint as the original inductors used by SURE, and had adequate current handling for the TDA7498 operating on 32V DC."
Click to expand...

Bourns SRF1280-150M

Ind @ 100 KHzL(μH) 15
Tol.(%) ±20
DCR(Ω)Max. 0.0333
Irms(A) 5.03
Isat(A) 9.66

SRF1280-150M.jpg

Digikey
cls d coil.jpg

SRF1280.jpg

from

View attachment SRF1280.pdf
 
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#3,092
Hi guys - interesting talk about inductors here with the TPA 3116. From my understanding, inductors in the LC output filter don't really affect the gain in the passband (below 20 kHz) for class D (in other words, the sound we hear), but can have an effect on amp efficiency and attenuation at the switching frequency.

Yet there are a lot lot of posts where there are audible differences in sound quality are noted using different inductor types?
 
#3,098
#3,099
Lo_Tse said:
This is basically the YJ blue/black board. The price includes everything (PSU, case, connectors etc.) and seems to be a good deal. Check out the shipping cost before you pull the trigger.

Regards,
Click to expand...

I haven't got that far yet. But as i can see now the shipping is 40$. Auch! :-/ But i have been attempting to created the same "kit" by buying the parts from aliexpress/ebay, it still doesnt compete with the price, especially since all the preparations are done. I just need this as a temporary solution, hence i'm finishing up my TAS5630B units and digital receiver.
 
#3,100
laudio said:
Such as? If the passband isn't affected then?
Click to expand...

Your comment reminded me of the age old discussion/argument that has been going on forever int the "High-end" audio equipments circle for years:

One camp says the measurement did not show the any differences, there should be no difference in the sound

The other camp says, but I can an hear a difference. Are you sure you measure the right things?

Another example, many people claim resistors of different made sounds differently. Others say they are all 1 K resistors, why would it be. The measurement show no difference.

People call this subjective vs objective evaluation of components and equipments. I do not think there are any conclusion. This discussion/argument will not end anytime soon.

However, I would like to point out that hearing sound is a very personal thing and is highly subjective, therefore very difficult to quantify or measure.

Regards,
 
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