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