> Do you have any other filtering on the power supply input side
> to choke the 50Hz ?

No, but I am trying to discover what is possible passively. Initially
I thought a choke would be rather large, in value and perhaps size

IF a switcher was feasible, then I guess it would have to a buck-
boost to pick up the energy from both +ve and -ve peaks either
side of the DC

Thanks

Joe


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