300W gainclone

[inertial]

Thanks all.

The Treshold 4000 is totally destroyed, all transistors, and the repair cost is more than the value.

abraxalito: what can you say to me about this TDA7293?
Is it a big chip, or multiple chips?

Thanks again.

 

[abraxalito]

Physically same size as LM3886 but has a mode that allows them to operate in single master with many slaves. You can find examples of paralleled amps on eBay using this chip.

 

[inertial]

Ok thanks!

Do you have a specific link?
Cheers!

 

[abraxalito]

Here's an example - I'm not endorsing it as I haven't tried one myself, but from the pics it looks OK - TDA7293 Parallel 250W Mono Power Amp Board Kit New Y25 | eBay

 

[inertial]

Hi! Thanks for the link.

I like that module. But I have read that it accept + or - 30V only.
Do you mean to use 3 modules in parallel and power with + or - 75V?

I'am curious about this amp. Is it a sort of Gainclone integrated chip?

Thanks!

 

[AndrewT]

Can you see the 50V rating on the capacitor?
No you cannot put +-75V into a 50V capacitor.

What are the voltage limits for the TDA chipamp?

 

[Jim W]

No you cannot put +-75V into a 50V capacitor.

Sure you can, but the long term results are not likely to be good. 😀

 

[JMFahey]

Sure you can, but the long term results are not likely to be good. 😀

Sorry but no.
You might apply 50% above rated voltage on a *film* capacitor and get away with it, they are routinely tested at 2X rated voltage; maybe (that's iffy) you could do that in a ceramic, but no standard electrolytic has that much extra voltage tolerance.
At best, life will be measured in minutes or hours, not even days.
There's no real film layer in them, but a chemically created "crust" and it's quite tightly specified.