Re: [CAD_CAM_EDM_DRO] Another EDM Approach

Alexandre Guimarães wrote:

> Hi,
>
> > I had wondered whether it would be possible to pick up enough current for
> > sensing by wrapping a few turns of wire around the power wire to the
> > electrode and limiting the voltage on this by using a fast zener diode or
> > something.
>
> What about a hall-effect sensor ? At the currents involved it would be
> probably bery effective and best of all, completely isolated from the
> current path ! Allegro has some nice linear parts.

hall effect devices are pretty good for sensing currents, but they are not
fast. A bare hall device provides only a couple of mV of signal. Most
amplified hall devices would be slow to respond to the kinds of pulses
we are looking at. I think a current transformer might be a lot easier to
get working properly.

Jon