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 Vs through the upper winding L2 of the primary of {HEAD ~ 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 Vs through the upper winding L2 of the primary of { HEAD ~ transformer T } through { TAIL ~ transistor Q2 } to ground
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