You might just be over driving the amp. See if you can find the op-amp, it should have some kind of heat sink attached, then google the serial number to find a spec sheet.
I found that this type of project is more trouble than its worth. Starting from scratch is better. I built a chipamp last summer. It was a pretty easy project, like legos only with soldering.
Need help from someone whose know about electronics and sound
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You might just be over driving the amp. See if you can find the op-amp, it should have some kind of heat sink attached, then google the serial number to find a spec sheet.
I found that this type of project is more trouble than its worth. Starting from scratch is better. I built a chipamp last summer. It was a pretty easy project, like legos only with soldering.