Re: Gecko 5V supply You gotta have ground!

Hi,
You are right, a DC supply has a plus and a minus. But just
like in a car, if you hook the minus to the frame of the car! The
frame becomes ground. Computers use a case ground system. This helps
eliminate RF noise. Digital signals need a ground. I used to work
with techs who did not hook there scope grounds to the circuit. Lots
of laughs watching them troubleshoot. Every IC in a computer has one
pin going to ground. The only exception might be an opto coupler in
the modem.

John

--- In CAD_CAM_EDM_DRO@y..., jesse <jkbrennan@w...> wrote:
> On DC power circuits neither side is grounded. So both the + or -
buss has zero potential to ground. Years ago when I was running
> diesels generating DC power for electrolytic hydrogen it was
normal to feel the bolted buss connections looking for hot spots.
> It took watching someone else doing this a few times before
starting to do it. Just don't grab both busses at the same time.
> I would have to do some checking before I did this on electronic
systems.
> Jesse
>
> mariss92705@y... wrote:
>
> > Hi,
> >
> > Most PCs have a game port. The +5VDC is available on pin of the
game
> > port. You cannot electrocute yourself off of 5 volts even if you
put
> > the wires in your mouth and stand in a tub of salt water. Haven't
> > tried it myself but I am sure.
> >
> > Mariss
> >
> > --- In CAD_CAM_EDM_DRO@y..., jvicars@c... wrote:
> > > The Gecko 201 manual says that the 5V for step and direction
must
> > come
> > > from the indexer/pulse source. I.E. the computer. I don't
really
> > > understand how to accomplish this. Can you get 5V through the
> > > parallel port somehow, or do you have to run a 5V line from the
> > > computer to the drivers?
> > > Anybody have advice on how to hook this up?
> >
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