On Oct 6, 2009, at 12:25 PM, Olin Lathrop wrote:

> that was without the magnetics, which will be the expensive part.

The problem with most isolated DC-DC converters is that they end up  
using some custom-made transformer designed for optimal efficiency in  
exactly that circuit.  Surely there has to be SOME standard low-cost  
magnetic component suitable for <50mA worth of power isolation?   
(thinking of: "Joule thief" bifilar ferrite bead, 600ohm telco  
transformers, ethernet magnetics, DSL magnetics, etc...)

BillW

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