Power amplifier amplifier chip measurement method:
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1, after a period of power, hand touch the temperature of the integrated op amplifier block, if the temperature is greater than 50 ° C, it should be suspected whether it is damaged.
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2, measure its DC current, should be within a few milliamps. Otherwise it is damaged.
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3, integrated op amp has a single op amp and several op amp combined together, should be familiar with its power supply and input and output feet. This also has a certain rule can be found and look for the relevant manuals to know. The resistance between the input feet of the integrated operation amplifier should be relatively large (generally greater than 10 M ohms), and the measurement value should be observed when the input has no limit diode, otherwise it is undoubtedly damaged. How to detect the power amplifier IC on the power amplifier board?
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4, online measurement input voltage should be relatively small. Generally less than 0.1V. If you touch the input side by hand, the voltage should change at the output side, or if you touch the two ends of the feedback resistance by hand (equivalent to a parallel resistor), the output will also change accordingly.