I`m searching a circuit of a impulse 500wats power supply(220v/2x30v).The reson for this is simple.The transformers with 500w have huge dimensions ,they`re very expensive and if you found what you`re looking for,you`ve got to participate in the lottary because it `ll guarantee you the jackpot.I mean that you can never find what you`re looking for.So if someone got a similar circuit I`ll be very gratefull.