Re: [CAD_CAM_EDM_DRO] EDM design

I'd reccomend the IRF's too, but a higher voltage rating like maybe the 500's.
then std 'clock' drivers will run them. The "high" voltage is cuz the
discharge typically
causes a spike that can puncture the Fets. The spike from a 100V= supply
can be 250V+. We used Irf250's for a while till local line regulation got
loose enuf where the "100V="
became 108 or even 113, so the Irf250's blew under hi loads. The "std clock
drivers"
are what Jon spoke of, fet drivers from DigiKey. Expect 3 amp loading per
device
(old edm concept) this keeps the load per fet lower. Using current limiting
resistors?
maybe 9ohm at 100+ watts? All these wires and wound resitors make for a nice
reactive dump after your oscillator turns off, so limit your liability by
using smaller,
cheaper devices rather than the nice expensive IGBT.
If IR has their own drivers, get the app notes & prices. Certainly the
mfctr knows how
to drive em right.

tomp