Correspondingly, each time transistor Q2 is driven from a non conducting condition to a conducting condition in response to the positive going pulses applied by the controller 14 via line 13, current flows from the voltage source {HEAD ~ Vs} through the upper winding L2 of the primary of transformer T through {TAIL ~ transistor Q2} to ground 
Correspondingly , each time transistor Q2 is driven from a non conducting condition to a conducting condition in response to the positive going pulses applied by the controller 14 via line 13 , current flows from the voltage source { HEAD ~ Vs } through the upper winding L2 of the primary of transformer T through { TAIL ~ transistor Q2 } to ground
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