LM1875 or TDA7498 For good clean sound (Boards shown in the post)

[moppy]

Received the board. Quality of the board is very good. Ic seems to be authentic. You be the judge.

Where do you get this list?

 

[r_kalar_2]

moppy, I am guessing that you are asking about the amplifier module. Here it is:
Aiyima Classic LM1875 20W+20W Audio Power Amplifier Board With Speaker Protection Warm Sound Bile Fever Circuit DIY KITS-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

 

[moppy]

moppy, I am guessing that you are asking about the amplifier module. Here it is:
Aiyima Classic LM1875 20W+20W Audio Power Amplifier Board With Speaker Protection Warm Sound Bile Fever Circuit DIY KITS-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

Yes. I just bought a bare board too. Either TDA2030/a or LM1875. Any idea which one is better choice?

 

[r_kalar_2]

Lm1875 I guess. Tda2050 is equivalent to lm1875, not far behind in sound quality as I have read in various thread. But tda2050 is a rare thing now. Tda2030 doesn't have the same power as lm1875.

 

[moppy]

Lm1875 I guess. Tda2050 is equivalent to lm1875, not far behind in sound quality as I have read in various thread. But tda2050 is a rare thing now. Tda2030 doesn't have the same power as lm1875.

I think so but tda2030a is slightly more wattage than tda2030 but still not powerful than lm1875. Sourcing lm1875 is not easy. Tomorrow I'll go to local shops and check it out.

 

[asuslover]

For the ones who still like the tda2050 , take a look of these:
http://www.unisonic.com.tw/datasheet/TDA2050.pdf
They are legit.

 

[moppy]

NOS

Found this today. NOS.

 

[r_kalar_2]

These are not original IC. Probably TDA2030A. But those tda2050 looks good. But I am not an expert.

 

[moppy]

These are not original IC. Probably TDA2030A. But those tda2050 looks good. But I am not an expert.

Do you mean the LM1875T is TDA2030? Can you teach me how to identify fake LM1875T?

 

[r_kalar_2]

Look at this images. These are authentic as far as I know.

 

[moppy]

Look at this images. These are authentic as far as I know.

Hmmm... it's really different from yours. Is there any practical way to test it?

 

[AndrewT]

I would test with PSU set to one volt below datasheet "absolute max" supply voltage.
First with shorted input and open load.
Then attach 100ohms load.
Then apply low level 1kHz signals and gradually increase until the output reaches Vpp aproximately 2/3rds of supply rails.
This roughly hits maximum dissipation in the chip and thermally stresses it, while high voltage is applied. But the output currents are not too damaging since the load is drawing only 8% of rated values.

 

[r_kalar_2]

Hmmm... it's really different from yours. Is there any practical way to test it?

Apart from the AndrewT's advice, I have found a link. You have to use google translate.
LM1875真伪辨别_wildboy_新浪博客

 

[moppy]

Apart from the AndrewT's advice, I have found a link. You have to use google translate.
LM1875真伪辨别_wildboy_新浪博客

Thanks. I can read chinese

 

[moppy]

I have returned the fake LM1875T, can I install TDA2050 into the same pcb suppose to accept LM1875T/TDA2030?

 

[asuslover]

yes you can , you might need to change a few resistors , can you post a picture of your tda2050?

 

[moppy]

yes you can , you might need to change a few resistors , can you post a picture of your tda2050?

Is this ok?

 

[r_kalar_2]

You can follow this one:
DIY TDA2050 Hi-Fi Chip Amplifier (chipamp)
Also I have attached a schematic from the datasheet.

 

[r_kalar_2]

Popoulated. Hopefully will test today.

 

[moppy]

Sorry, this has a better image quality.

Sorry I don't know how to read the circuit properly cos I am a noob in electronics. The boards I bought from ebay few years ago.

Attach here is a clearer picture, hopefully can get some feedback.