The second coil L2 acts as a demagnetisation coil and has the effect that a part of the energy stored in the first coil L1 is charged into the second capacitor C2 via the third diode D3, as {TAIL ~ a result} of which {HEAD ~ a negative voltage} is built up across the first resistor R1 
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The second coil L2 acts as a demagnetisation coil and has the effect that a part of the energy stored in the first coil L1 is charged into the second capacitor C2 via the third diode D3 , as { TAIL ~ a result } of which { HEAD ~ a negative voltage } is built up across the first resistor R1
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