Question about Inverter Pure Sine Wave 1500w Inverter
IC 7805 & IC 7812 were blown, replaced,but it is still not working and gives continuous buzzer as soon as the battery is connected. The inverter uses IC PIC 16F78. I replaced crystal also.
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Posted on Jul 20, 2010
If the regulating circuits 78xx had blown it means that the input voltage which may be 18 - 35 VDC has been fed to all ICs. Some of them or all may have burnt. I did not understand which crystal did you change (the 2 - 20 MHz Quartz may be), but I think that rather the PIC was damaged.
If you have Oscilloscope on hand, check the oscillations on PICs clock.
Posted on Jul 18, 2010
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Posted on Jan 02, 2017
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