Re: FS: New 4 axis microstepping driver $45.00 USD

--- In CAD_CAM_EDM_DRO@yahoogroups.com, John Johnson <johnatl@m...>
wrote:

> Using a couple of the circuits in the LM78xx datasheet available

here:

> http://www.fairchildsemi.com/pf/LM/LM7805.html
> It would be possible to build a regulator with short circuit

protection.

> See figures 10 & 13.

JJ,

I would think that the LM317 would be a better solution.

http://www.fairchildsemi.com/pf/LM%2FLM317.html

It is rated for 1.5 amps and *** 40 volts ***. Since a desktop
machine only needs about 4 amps @ 30 volts for a power supply, 3 of
these would seem to be a very interesting solution to the issue of
the 35 volt supply limit of the A3977. Pretty inexpensive too.

Anyone ever play with creating a power supply with 3 LM317's in
parallel?

Since we are going interesting places with this discussion, anybody
ever run any tests on the A3977 to see if the same overvoltage limits
were applicable at 1-2 amps (the limits on our board) instead of max
current draw?

Fred Smith - IMService

> On Wednesday, Mar 17, 2004, at 17:40 US/Eastern, Fred Smith wrote:
> >> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Fred Smith"

<imserv@v... wrote:

> >>>> We have a limited edition, 4 axis, microstepping driver

available.Based

> >>> on
> >>>> the Allegro A3977 chip. The board is rated at 2 amps per axis
> > and
> >>>> maximum of 35vdc. This is a promotional item and is subject to
> >>> prior
> >>>> sale. Quantities are very limited.
> >
> > Info at: http://www.cadcamcadcam.com