Hi Folks,
Help!
Can anyone suggest a good way of creating a 5V supply (max 250mA) from a 40V
supply. Most of the simple regulators don't seem to like this high an input
voltage. Oh and if this is too easy how about generating a +5V supply again
250mA from a -40V supply, needs to be able to share the same ground as the
+40v and -40v supply and must be +5V not -5V.

What's it for well I'm building a controller for my 3 Axis milling machine.
It uses chop mode bipolar stepper motors. I've found a supply from an old
HiFi amp that provides -40V 0 +40V I would like to use this as the power for
the steppers. I would also like to drive the logic (PIC based) from the same
supply. Ideally I'll use the +40v for the stepper and the -40V for the logic
to reduce noise, hence the questions... See www.gloomy-place.com/cnc.htm for
pictures of the milling machine...

Thanks

Andy

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