I hgave this car amplifier, it has a SMPS supply for each channel, using the
classic TL494 and IRFZ44 design.

the outputs were shorted, and the IRF were blown apart. i replaced the
outputs and the IRF, along with the gate drive resistors to the mosfets.

the amp functioned after that, and had no DC offset, amp was running
reletively cool, and sounded nice. then the outputs shorted again out of
nowhere and blew out the power suppl yagain.

so i replaced all those parts again, and this time i changed the drivers to
the outputs on that channel.

it ran for 4 days working nicely, and bam, ouputs go again.

im at a loss, i dunno whats up. i checked all the resistors and transistors
in that side of the amp. come up wiht nothing. :-(