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why my output getting like this

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hi all i am using pic uC to get pwm output but the output is not quit well help me wer is the problem

the output is given to the h bridge ckt to drive pulse transformer
 
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base volt is 5v ...and collector voltis 15V

The two top transistors emitters are higher than 5V... When the bottom transistor is OFF the emitter is floating... It can't really earth through the transformer..
 
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