I've built amp on TDA7386? it works fine when I take signal from speaker output of soundcard. But when I try to take a signal from speaker output of car radio (built on TDA1515B), my amp starts short turn-offs (looks like something short curcuiting it's output). It is exactly not clipping? because from soundcard it can output more higher signal. I tryed to increase capasitor at power input, but gain no result.