| http://www.w3.org/ns/prov#value | - tage comparator A1 ; an error amplifier circuit 14 comprising resistors R4 and R6 and a transistor Q3 ; a current detecting circuit 15 comprising a current detecting element such for example as a resistor R5, current transformer or the like; and a control circuit 16 comprising a voltage comparator A2 and a transistor Q2, the control circuit 16 being arranged to impart to the blocking oscillator ci
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