LF: Re: Re: Current Transformers (off topic, but expertise probably here)

["Andy Talbot" <actalbot@southsurf.com>]

Rik - Oops. typing mistake there - the 0.3V came from 5 turns put on to
test, so the 4000 turn primary was correct.
Alan -  I don't see how a rule of thumb can give a fixed number of tuurns
per volt.  the critical parameter for sizing a transformer is based on
cross-sectional area, and for a sinusoidal device  V = 4.44.F.N.A.B.

I use this equation a lot for ferrite (and its SMPSU varient, V.t = N.A.B)
and it works fine, but not sure what sort of B is alloed in iron - for this
small transformer it looks as if Bcould be up to 1 Tesla pk.

Andy



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