Ebay cheap TDA7498 boards

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easp

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Joined 2016
He's too polite to say, but, your breath...

But maybe it is that he just doesn't have the knowledge to answer your question. If it even has an answer. I notice that there are is only one or two TDA8932 boards on ebay, and they don't have a power jack or volume control.

I don't recall seeing any issues with the (knockoff) Sanwu TDA7498 you linked to. You might look for a seller that at least includes a picture of bottom of the PCB showing the Sanwu logo. No guarantee that that's what you'll get, but your chances are probably better than buying from a listing that shows the bottom without the logo. I have a seller who has, so far, been a reliable source of genuine Sanwu boards, but they don't seem to deal in that particular one.

If you are going to use a TPA7498, make sure you have a beefy ~30-32v power supply to run it off of, otherwise you aren't going to get the power and performance you might expect.
 
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easp

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I think that comes from the same source as the previous listing you linked to, but, I think there is some confusion.

I wasn't warning you away from them. I was saying that they have been around for a while AND, I can't remember ever having heard someone say not to buy from them. In other words, no news is good news :)
 
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Lo_Tse

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Joined 2006
chienmort said:
So 7498 good for 36V but caps rated at 35V? They state 34V max but even 2V headroom is a bit too close. How easy is it to change those electrolytics?

Is that all you should change on those boards?
Click to expand...

The electrolytics are thru holes, so should not be difficult to remove. I have a different version of 7498 board, the caps are also 35 V :(. I have been running it at 24-25 V and it is loud enough for me. Because one of the output inductor's shield was broken during shipping, I decided to change all the inductors (which are thru holes). I replaced them with some Coilcraft surface mount ones - took some effort. I then measured the value original inductors that I removed. Not good, they ranged from 10-22 uH. So based on my experience, I would suggest changing the inductors.

Regards,
 
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afterlife2

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Lo_Tse said:
The electrolytics are thru holes, so should not be difficult to remove. I have a different version of 7498 board, the caps are also 35 V :(. I have been running it at 24-25 V and it is loud enough for me. Because one of the output inductor's shield was broken during shipping, I decided to change all the inductors (which are thru holes). I replaced them with some Coilcraft surface mount ones - took some effort. I then measured the value original inductors that I removed. Not good, they ranged from 10-22 uH. So based on my experience, I would suggest changing the inductors.

Regards,
Click to expand...

Thanks for the great info. Do you think this will work?
https://www.amazon.com/gp/product/B01D1CM6R8/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A2I9LON15DRZJO
 
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afterlife2

Member
Joined 2016
easp said:
I think that comes from the same source as the previous listing you linked to, but, I think there is some confusion.

I wasn't warning you away from them. I was saying that they have been around for a while AND, I can't remember ever having heard someone say not to buy from them. In other words, no news is good news :)
Click to expand...

I did understand, but wanted to know if there was one that was more dependable. Well we will see. :)
 
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Lo_Tse

Member
Joined 2006
afterlife2 said:
Thanks for the great info. Do you think this will work?
https://www.amazon.com/gp/product/B01D1CM6R8/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A2I9LON15DRZJO
Click to expand...

I have not used this particular PSU, so I cannot comment. But I have used different laptop bricks for different 3116 boards and they all worked for me. I did not encounter any noise issues either. As I mentioned earlier, I am running my 7498 board with a 24 V SMPS and it worked fine. I have a voltage booster on order and would like to try this 7498 board at higher voltage (30-32 V) and see whether there is performance improvement. For regular use, I think you have enough wattage. The class D amps are efficient.

Regards,
 
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afterlife2

Member
Joined 2016
Lo_Tse said:
I have not used this particular PSU, so I cannot comment. But I have used different laptop bricks for different 3116 boards and they all worked for me. I did not encounter any noise issues either. As I mentioned earlier, I am running my 7498 board with a 24 V SMPS and it worked fine. I have a voltage booster on order and would like to try this 7498 board at higher voltage (30-32 V) and see whether there is performance improvement. For regular use, I think you have enough wattage. The class D amps are efficient.

Regards,
Click to expand...

Thanks Lo is there a particular booster for the adapter I linked. I doubt I'd need one, but curious.
 
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