Hello again,

I am building a TDA7052A guitar amplifier with the following application diagram and volume control (on pin 4):



The power supply is 9V. The input of the TDA7052A is given from an MPF102 buffer circuit (not included in the diagrams).
I built a similar circuit using the TDA7052 feeding a 2", 8R, 1Wrms loudspeaker and 9V power supply also, without no problems.
But with TDA7052A feeding a 4.5", 8R, 5Wrms loudspeaker and 9V power supply the IC is overheating. And after one minute of play noise like farting in the background (and it comes to the surface when i lower down the tone pot of the guitar) appears . After this noise occurs the IC is permanently damaged, with my observations so far.
The question i have is if its possible the IC to get overheated because it can give its full power on the speaker (while with the 1Wrms speaker it could not)??

Thanks

 

Sorry, but i got to answer to my self. The noise was a bad wire connection on pin 6. And now the overheating is just heating..

Any ideas and opinions about the speaker Wrms and IC heating are still welcome.