Я бы поступил по другому- поставил С(емкость 1 мк ) последовательно с сетевой обмоткой - для начала
Измерил напряжение на обмотке и подобрал С до 110 вольт
Причем при подключенной нагрузке
Можно и по формуле расчитать
Кстати так и ток в нагрузке в небольших пределах будет стабилизироваться
У меня на таком принципе для авто аккума зарядник
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