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sine wave inverter

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guyz the circuit started working something better but there is one confusion the sine wave comes from the circuit but the problem is when i connect the microcontroller for pwm input and if i dont connect the ground of microcontroller to h bridge output is a good sine wave but when i connect the ground of both h bridge and controller the sine wave gets totally distorted how this can happen.........actually i was thinking the inverse of this that if ground will not be common the ckt wont work but its vice versa whats the concept behind that?
 
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