Re: [CAD_CAM_EDM_DRO] MAXNC 10

Hi Chris,

I got it from the MaxNC 4-phase driver board. See the last page, or the
recently posted schematic. +5 is on the bus wire between the DB-25
connector and the I.C.'s. The probe and limit sw. have pads on the PCB
in this area.

HTH

Alan KM6VV


Christopher Coley wrote:

>
> You get 5V where? Inside the MAXNC control box or from the PC??
>
> Chris.
>
> > -----Original Message-----
> > From: Alan Marconett KM6VV [mailto:KM6VV@...]
> > Sent: Thursday, November 08, 2001 1:50 PM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: Re: [CAD_CAM_EDM_DRO] MAXNC 10
> >
> >
> > Hi Chris,
> >
> > I get 5V from mine! I have a 1K pull-up for the probe line
> > (pin 13). I
> > need to add another pair for limit switches (not that I'll
> > necessarily
> > add them to the Sherline), and a E-stop switch (this I think I WILL
> > add).
> >
> > I agree, the design is on the "low cost" end. Reminds me of
> > a story in
> > the late 60's about how Muntz tv's were supposedly designed.
> > Story goes
> > that "Mad Man Muntz" start with a TV design (perhaps a
> > competitors), and
> > start removing parts, continuing to remove parts until all
> > that could be
> > removed without the TV failing were removed.
> >
> > Alan KM6VV
> >
> >
> > Christopher Coley wrote:
> > >
> > > Has anyone looked at the control box on the MAXNC. Last
> > night I was looking
> > > for a 5V source in the control box to add a pull-up
> > resistor for Limit and
> > > Digitizer inputs.
> > >
> > > The controller card has a five volt regulator but when
> > measured the output
> > > was only 2.3V. This is used to power three SN7400 NAND
> > chips that are used
> > > as buffer inverters to drive the drive transistors,
> > DIRECTLY no limit
> > > resistor, with a 1K pull-up to VCC (2.4V). This is where
> > the load is that
> > > is limiting the VCC.
> > >
> > > I ended up rewiring and modifying the controller so that
> > it now has the
> > > SN7400 output go through the resistor to the transistor
> > without the pull-up.
> > > Now I have a real 5V in the box.
> > >
> > > Has anybody else experieanced these issues. I think that
> > MAXNC screwed up
> > > majorly and thier configuration is bound to fail eventually.
> > >
> > > Chris.
> >
> > Addresses:
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> >
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> > bill,
> > List Manager
> >
> >
> >
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>
> Addresses:
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> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> Post messages: CAD_CAM_EDM_DRO@yahoogroups.com
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> bill,
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>
>
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