Mike,

I'd be interested to see their circuit. What magazine was it in?

I just threw this one together to solve my immediate problem. It has proven quite useful, but I'd like to eventually do full B-H plots, which I understand it just a matter of integrating the signal from another winding on the same core.

Apparently you can do it with a single winding, which would be handy for commercial choke testing. But I have only heard this as a rumour in documentation of a commercial B-H test unit, and have no idea how it is actually accomplished.

Regards,

Alan

Hi Alan

I meant to have a talk to you about this project at the T+T today. I have a similar one from a magazine I was going to build, I'll let you know how it goes.

Mike vk2kmb