Class AB automotive dc12-18 hifi level Four Channel Power Amplifier

[ericwestpheling]

Thanks. I submitted my design via easyeda + jlcpcb for fabrication and I’m using their assembly service. Total cost was around $25 for 10 boards fully assembled, all through-hole parts. Would have been less if I’d opted for surface mount parts. 2-3week shipping to USA was another $9. Very happy with the cost coming to less than $4/ea.

 

[NareshBrd]

Including the parts?
Heat sink?

 

[ljm_ljm]

Including the parts?
Heat sink?

Radiator is not included.
It probably uses an abandoned CPU heat sink. You don't need a fan.
Transport radiators on international express. The postage may exceed the price of the radiator itself.

 

[ljm_ljm]

Thanks. I submitted my design via easyeda + jlcpcb for fabrication and I’m using their assembly service. Total cost was around $25 for 10 boards fully assembled, all through-hole parts. Would have been less if I’d opted for surface mount parts. 2-3week shipping to USA was another $9. Very happy with the cost coming to less than $4/ea.

very nice. If you need anything, please contact me.
Tda7850 genuine. About 25 RMB, about 3 dollars.

 

[JMFahey]

very nice. If you need anything, please contact me.
Tda7850 genuine. About 25 RMB, about 3 dollars.

At last the mask comes off.

As suspected from the very beginning ( from answer #2 on), this exaggerated praise of an old indistinct run of the mill car chipamp WAS a thinly disguised vendor post.
Which should be in the Commercial Forum area.

a dealer who aspires to stand out from the rest, shouldn't we expect a bit more from you than the average ebay or aliexpress vendor

 

[ericwestpheling]

I am making an amplifier with 6 pieces, so they will share a large heatsink that’s part of the chassis. I have a number of them from old experiments with led that will be suitable. I am keeping a spreadsheet with costs of the various parts, it will be useful to see when it’s done the total cost.

I have to draw a small pcb for the exterior Phoenix connectors to the 2pin/3pin headers. For the in/outs.

Another pcb to distribute the power from an smps.
Overall I think I can keep costs below $200 for this amp.

 

[ljm_ljm]

At last the mask comes off.

As suspected from the very beginning ( from answer #2 on), this exaggerated praise of an old indistinct run of the mill car chipamp WAS a thinly disguised vendor post.
Which should be in the Commercial Forum area.

You think it's complicated. Actually, I only have two chips in my hand.
I don't make money on this chip. The purchase price is 25RMB.
Let me add. I have nearly $1million in American stocks. DIY is amateur. Entertainment.
If anyone is interested. I can help them buy. You can even help them process PCB.
It's very convenient in China. And cheap.
I don't sell tda7850. If you want to ask me what diy kit I'm selling.
I guess the most is the complete set of triode type. I don't sell much integrated circuits.
But I recommend him. Because tpa3116 or tda8920 tda8950 is really bad.

 

[ljm_ljm]

I am making an amplifier with 6 pieces, so they will share a large heatsink that’s part of the chassis. I have a number of them from old experiments with led that will be suitable. I am keeping a spreadsheet with costs of the various parts, it will be useful to see when it’s done the total cost.

I have to draw a small pcb for the exterior Phoenix connectors to the 2pin/3pin headers. For the in/outs.

Another pcb to distribute the power from an smps.
Overall I think I can keep costs below $200 for this amp.

Hope to see your products.
In addition, I hope to try to see those with personality. Artwork. Instead of the industrial products such as class D mobile speakers.

 

[JMFahey]

I have nearly $1million in American stocks.

Wow!!!
NOW I´m humbled!!!!!

 

[ljm_ljm]

Wow!!!
NOW I´m humbled!!!!!

Ha, don't think too much. I know Chinese people. Most of them are more than 20 times mine.
The house I live in now can sell for almost $1.5 million. And I have more than one house.
So DIY is a hobby.
Because many of us don't need work to make money.
If you were in China, you would know. I give many people DIY matching products.
of course. If I can design some products. Then sell it. Finally, I can make some money.
I'll be happy, too. This proves that my technology is very powerful. It's more exciting than stocks.

 

[ericwestpheling]

Just ignore each other and move on, this is not a good look. Thank you all for the helpful info.

 

[ljm_ljm]

So you have no measurements of your own, especially at 12V as your title suggested.


Cheers,
Patrick

This is not the best performance indicator. But it is true.
I don't like good-looking data. I only like real data. Even if it's not that beautiful
It doesn't matter.

 

[EUVL]

Thanks for the measurements.
So noise level masks everything, or I misread your FFT ?

Were you using SMPS ?


Patrick

 

[ljm_ljm]

Thanks for the measurements.
So noise level masks everything, or I misread your FFT ?

Were you using SMPS ?


Patrick

No, I use transformers.

 

[OldDIY]

Was looking at Pam8406 in AB mode

TDA7297 Kit ($1,5)