burnt audio IC

[khalaf]

hi everybody,

i have a subwoofer of about 300watt, the IC responsible for speaker amplifier was burnt and i can't read its number,
i draw the circuit and it seems as a dual-opamp IC, but all the dual opamp ics i've found are of different connection
so i drew the schmatic and sent it to you in the hope that you may help me finding the right IC.

note: it is a dual opamp without external feedback.
the included schematic is of the IC.

i need your help please.[/img]

 

[khalaf]

HEY, noone would like to give me a small help, please i'm in deep need for help

 

[Nigel Goodwin]

An unknown IC?, in an unknown amplifier?, how is anyone supposed to be able to offer advise on that?.

For a start you might try mentioning the make and model of the unit, and what the IC actually does! - perhaps someone has seen one before?.

 

[khalaf]

yes man,

thanks alot for interest ,

but i mentioned that it is a dual-opamp IC , so it is an operational amplifier, but the matter is that i has different connection pins from all the dual-opamps i've dealed with, so u have just to find a dual-opamp IC that match the pin assignment as shown in the pic,

thanks again for interest

 

[hotwaterwizard]

The Picture needs help. I tried to fix it but still can not read the values.

 

[khalaf]

hey everyone,
i finally found the chip i'm seeking, it is TDA2822M, i bought it and soldered it to the subwoofer and it is working properly now, thanks alot for paying attention and i'm ready for any help

 

[Nigel Goodwin]

hey everyone,
i finally found the chip i'm seeking, it is TDA2822M, i bought it and soldered it to the subwoofer and it is working properly now, thanks alot for paying attention and i'm ready for any help

I thought you said this was a 300W subwoofer?, and the chip you were looking for was a dual opamp?.

The TDA2822M is a dual low power amplifier (not an opamp), which outputs about 0.5W per channel - assuming it's bridged?, you could get about 1W mono from it, or really pushed about 2W at pretty high distortion.

So assuming this is the 'power amp' for your sub-woofer, you only have a 1W subwoofer!.

 

[hotwaterwizard]

I would bet they use it as a preamp or Driver amp

 

[Nigel Goodwin]

I would bet they use it as a preamp or Driver amp

It's not really suitable for either?, more likely it's a computer sub-woofer, and only really 1W?.

 

[hotwaterwizard]

Here is an example of what I am talking about.

 

[Nigel Goodwin]

Here is an example of what I am talking about.

Yes, it's fairly common practice, using an OPAMP as part of a power amp, but the chip in question ISN'T an opamp, and it wouldn't be very suitable. It's also VERY unlikely that such an opamp would be destroyed and unable to have it's number read!.