i am not much into transformers, but isn't so-called zero-flux thing something similar? https://electronics.stackexchange.com/questions/511880/measure-dc-curre

i am not much into transformers, but isn't so-called zero-flux thing something similar? https://electronics.stackexchange.com/questions/511880/measure-dc-current-with-current-transformer https://electronics.stackexchange.com/questions/511880/measu...