Re: [CAD_CAM_EDM_DRO] Things to check? Crispy Fried Geckos? No motion...

----- Original Message -----
From: "Tim Goldstein" <timg@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, September 17, 2003 9:53 AM
Subject: RE: [CAD_CAM_EDM_DRO] Things to check? Crispy Fried Geckos? No
motion...


> Jim,
>
> He has an open circuit. The +5V is from a power supply that is not
> common to the laptop as he described it. The common pin (+5V in this
> case) on the Gecko is only tied to the optos on the drive and not to
> anything else. The step & direction pins on the Gecko are also only tied
> to the optos.
>
> So, we have the laptop parallel port pins connected to the Gecko step
> and direction. We have an isolated power supply connected to the Gecko
> +5V common. That is an open circuit as there is no connection between
> the isolated supply and the laptop. Of course he may have a second
> problem in that the laptop may not put out the full required voltage,
> but the main problem now is the open circuit. If he was using the laptop
> for the +5V you would be correct.
>
> Tim
> [Denver, CO]
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> Mach1 & DeskCNC with credit card ordering
> www.KTMarketing.com/Sherline
> e-mail me at Timg @ KTMarketing.com for items not yet listed
>
>
> > -----Original Message-----
> >
> >
> > Tim the current flows through the drive chip in the laptop
> > through the led in the optoisolator to the 5v in the laptop.
> > circuit complete. In other words it is an active low that is
> > required in the Geckos. I think his problem is the drive
> > capability of a laptop may not be enough to drive the
> > optoisolators. I us a 74hct541 driver between the PC and the
> > Geckos. Jim
> >
>
>
>
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