{TAIL ~ The invention} 2 comprising, in addition, a start up circuit connected in circuit with {HEAD ~ an input source voltage} of the transformer to initially drive the pulse width modulator and the main power switch and which is disabled by said non dissipative snubber means when the stepped down output voltage therefrom reaches a predetermined value 
{ TAIL ~ The invention } 2 comprising , in addition , a start up circuit connected in circuit with { HEAD ~ an input source voltage } of the transformer to initially drive the pulse width modulator and the main power switch and which is disabled by said non dissipative snubber means when the stepped down output voltage therefrom reaches a predetermined value
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